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PATTERSON UTI ENERGY INC - Annual Report: 2005 (Form 10-K)

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
Form 10-K
     
(Mark One)
   
þ
  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
    For the fiscal year ended December 31, 2005
 
or
 
o
  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 
    For the transition period from           to
Commission File Number 0-22664
 
Patterson-UTI Energy, Inc.
(Exact name of registrant as specified in its charter)
     
Delaware
(State or other jurisdiction of
incorporation or organization)
  75-2504748
(I.R.S. Employer
Identification No.)
     
4510 Lamesa Highway, Snyder, Texas
(Address of principal executive offices)
  79549
(Zip Code)
Registrant’s telephone number, including area code:
(325) 574-6300
Securities Registered Pursuant to 12(b) of the Act:
None
Securities Registered Pursuant to 12(g) of the Act:
(Title of class)
Common Stock, $.01 Par Value
      Indicate by checkmark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ or No o
      Indicate by checkmark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes o or No þ
      Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes þ         No o
      Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    þ
      Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):
Large accelerated filer  þ Accelerated filer  o Non-accelerated filer  o
      Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes o         No þ
      The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2005, the last business day of the registrant’s most recently completed second fiscal quarter, was $4,657,765,918, calculated by reference to the closing price of $27.83 for the common stock on the Nasdaq National Market on that date.
      As of March 29, 2006, the registrant had outstanding 172,653,028 shares of common stock, $.01 par value, its only class of voting common stock.
      Documents incorporated by reference:
      Definitive Proxy Statement for the 2006 Annual Meeting of Stockholders (Part III).
 
 


TABLE OF CONTENTS

PART I
Item 1. Business
Item 3. Legal Proceedings.
Item 4. Submission of Matters to a Vote of Security Holders.
PART II
Item 5. Market for Registrant’s Common Equity and Related Stockholder Matters and Issuer Purchases of Equity Securities.
Item 6. Selected Financial Data.
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Item 7A. Quantitative and Qualitative Disclosures About Market Risk
Item 8. Financial Statements and Supplementary Data.
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.
Item 9A. Controls and Procedures.
Item 9B. Other Information
PART III
Item 10. Directors and Executive Officers of the Registrant.
Item 11. Executive Compensation.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.
Item 13. Certain Relationships and Related Transactions.
Item 14. Principal Accountant Fees and Services.
PART IV
Item 15. Exhibits and Financial Statement Schedule.
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
Report of Independent Registered Public Accounting Firm
PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME
PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY
PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CHANGES IN CASH FLOWS
PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
SIGNATURES
EXHIBIT INDEX
Subsidiaries
Consent of Independent Registered Public Accounting Firm
Certification of Chief Executive Officer
Certification of Chief Financial Officer
Certification of Chief Executive Officer and Chief Financial Officer Pursuant to Section 906


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FORWARD LOOKING STATEMENTS
      This Annual Report on Form 10-K (including documents incorporated by reference herein) contains statements with respect to our expectations and beliefs as to future events. These types of statements are “forward-looking” and subject to uncertainties. Readers are cautioned that such forward-looking statements should be read in conjunction with our disclosures under the heading “Risk Factors,” beginning on page 11.
PART I
Item 1. Business
Available Information
      This Annual Report on Form 10-K, along with our Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, are available free of charge through our Internet website (www.patenergy.com) as soon as reasonably practicable after we electronically file such material with, or furnish it to, the United States Securities and Exchange Commission (“SEC”).
Overview
      Based on publicly available information, we believe we are the second largest owner of land-based drilling rigs in North America. The Company was formed in 1978 and reincorporated in 1993 as a Delaware corporation. Our contract drilling business operates primarily in:
  •  Texas,
 
  •  New Mexico,
 
  •  Oklahoma,
 
  •  Louisiana,
 
  •  Mississippi,
 
  •  Colorado,
 
  •  Utah,
 
  •  Wyoming,
 
  •  Montana,
 
  •  North Dakota,
 
  •  South Dakota, and
 
  •  Western Canada (Alberta, British Columbia and Saskatchewan).
      As of December 31, 2005, we had a drilling fleet of 403 drilling rigs. A drilling rig includes the structure, power source and machinery necessary to cause a drill bit to penetrate earth to a depth desired by the customer.
      We provide pressure pumping services to oil and natural gas operators primarily in the Appalachian Basin. These services consist primarily of well stimulation and cementing for completion of new wells and remedial work on existing wells. We provide drilling fluids, completion fluids and related services to oil and natural gas operators in Texas, Southeastern New Mexico, Oklahoma, the Gulf Coast region of Louisiana and the Gulf of Mexico. Drilling and completion fluids are used by oil and natural gas operators during the drilling process to control pressure when drilling oil and natural gas wells. We are also engaged in the development, exploration, acquisition and production of oil and natural gas. Our oil and natural gas operations are focused primarily in producing regions of West and South Texas, Southeastern New Mexico, Utah and Mississippi.

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Embezzlement and Restatements
      On November 3, 2005, we announced the resignation of our Chief Financial Officer (“CFO”), Jonathan D. Nelson (“Nelson”). On November 10, 2005, we announced that, based on information received by Company senior management on November 9, 2005, the Audit Committee of our Board of Directors began an investigation into an apparent embezzlement from us by Nelson.
      On December 22, 2005, upon recommendation of Company management and the Audit Committee of our Board of Directors, we announced that based on the results to date of the internal investigation into the facts and circumstances surrounding the embezzlement by Nelson, we would restate previously issued financial statements and amend our previously issued Annual Report on Form 10-K for the year ended December 31, 2004 and Quarterly Reports on Form 10-Q for the periods ended March 31, June 30 and September 30, 2005. These restatements reflect losses incurred as a result of payments made to or for the benefit of Nelson that had been recognized in our accounting records and previously issued financial statements as payments for assets and services that we did not receive. Previously issued financial statements have also been restated for the effects of the correction of other errors that are immaterial both individually and in the aggregate. These other adjustments relate primarily to previously reported property and equipment balances that resulted from our review of our property and equipment records and the underlying physical assets in connection with investigation of the embezzlement. We have restated such financial statements, and on March 17, 2006, we filed our amended Annual Report on Form 10-K/A and on March 27, 2006, we filed our amended Quarterly Reports on Form 10-Q/A with the SEC.
      Most of the embezzled funds result from Nelson causing the wiring of Company funds aggregating approximately $72.3 million, to, or for the benefit of, entities owned and controlled by him. Nelson was originally able to initiate these wire transfers by requesting the wire transfers himself in telephone calls to one of the Company’s banks. After changes to the Company’s internal controls and procedures in 2004, Nelson initiated the wire transfers through instructions to one of his subordinates and by the creation of fraudulent invoices containing forged senior management approvals. This false documentation was created by Nelson to conceal the true nature of these transactions from the Company and its independent registered public accountants.
      Nelson also instructed certain former employees, who worked under his supervision, to alter management reports related to property and equipment expenditures. Nelson also created fictitious property and equipment approval forms with forged signatures.
      The total amount embezzled was approximately $77.5 million in cash, excluding any tax effects, beginning with the year ended December 31, 1998 through November 3, 2005 as follows (in thousands):
             
From 1998 to December 31, 2004
  $ 58,961  
From January 1, 2005 to September 30, 2005(1)
    12,193  
       
 
Total through September 30, 2005
    71,154  
From October 1, 2005 to November 3, 2005 (net of $1,500 repayment)(1)
    6,350  
       
   
Total embezzlement
  $ 77,504  
       
 
(1)  The total amount embezzled during 2005 was $18,543,000 and the Company incurred $1,500,000 of professional fees and expenses as a result of the embezzlement. Accordingly, the total embezzled funds and related expenses in 2005 were $20,043,000.
      We promptly advised the SEC when we became aware of the embezzlement. The SEC promptly obtained a freeze order on Nelson’s assets (including assets held by entities controlled by him) and a Receiver was appointed to collect those assets. The United States attorney for the Northern District of Texas obtained an indictment against Nelson and investigation of this matter continues.
      The Company understands that the Receiver will ultimately liquidate the assets and propose a plan to distribute the proceeds. While the Company believes it has a claim for at least the full amount embezzled, other creditors have or may assert claims on the assets held by the Receiver. As a result, recovery by the

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Company from the Receiver is uncertain as to timing and amount, if any. Recoveries, if any, will be recognized when they are considered collectable.
      The effects of the embezzlement on our financial position follow (in thousands):
                 
    December 31,
     
Decrease in amounts previously reported   2004   2003
         
Assets(1)
  $ (56,133 )   $ (38,540 )
Liabilities(2)
    (20,848 )     (15,044 )
             
Retained earnings and stockholders’ equity
  $ (35,285 )   $ (23,496 )
             
 
(1)  The amount includes a decrease in Federal and state income taxes receivable of $1.0 million in 2003.
 
(2)  Consists of an increase in Federal and state income taxes payable of $1.3 million in 2004 and decreases in deferred tax liabilities of $22.2 million and $15.0 million in 2004 and 2003, respectively.
      In December 2005, two purported derivative actions were filed in Texas state court in Scurry County, Texas, against our directors, alleging that the directors breached their fiduciary duties to us as a result of alleged failure to timely discover the embezzlement. The Board of Directors formed a special litigation committee to review and inquire about these allegations and recommend our response, if any. The lawsuits seek recovery on behalf of and for us and do not seek recovery from us.
      The financial statements and related financial and statistical data contained in this Report have been restated to provide for, net of related tax effects, (1) the effects of losses incurred as a result of the embezzlement and (2) the effects of the correction of other errors that are immaterial both individually and in the aggregate.
Industry Segments
      Our revenues, operating profits and identifiable assets are primarily attributable to four industry segments:
  •  contract drilling,
 
  •  pressure pumping services,
 
  •  drilling and completion fluids services, and
 
  •  oil and natural gas development, exploration, acquisition and production.
      With respect to these four segments:
  •  the contract drilling segment had operating profits in 2005, 2004 and 2003,
 
  •  the pressure pumping segment had operating profits in 2005, 2004 and 2003,
 
  •  the drilling and completion fluids segment had operating profits in 2005 and 2004 and an operating loss in 2003, and
 
  •  the oil and natural gas segment had operating profits in 2005, 2004 and 2003.
      See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 17 of Notes to Consolidated Financial Statements included as a part of Items 7 and 8, respectively, of this Report for financial information pertaining to these industry segments.
Contract Drilling Operations
      General — We market our contract drilling services to major and independent oil and natural gas operators. As of December 31, 2005, we owned 403 drilling rigs which were based in the following regions:
  •  156 in the Permian Basin region (West Texas and Southeastern New Mexico),
 
  •  53 in South Texas,

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  •  42 in the Ark-La-Tex region and Mississippi,
 
  •  88 in the Mid-Continent region (Oklahoma and North Central Texas),
 
  •  46 in the Rocky Mountain region (Colorado, Utah, Wyoming, Montana, North Dakota and South Dakota), and
 
  •  18 in Western Canada (Alberta, British Columbia and Saskatchewan).
      Our drilling rigs have rated maximum depth capabilities ranging from 4,000 feet to 30,000 feet. Of our drilling rigs, 42 are SCR electric rigs and 361 are mechanical rigs. An electric rig differs from a mechanical rig in that the electric rig converts the diesel power (the sole energy source for a mechanical rig) into electricity to power the rig.
      Drilling rigs are typically equipped with:
  •  engines,
 
  •  drawworks or hoists,
 
  •  derricks or masts,
 
  •  pumps to circulate the drilling fluid,
 
  •  blowout preventers,
 
  •  drill string (pipe), and
 
  •  other related equipment.
      Over time, components on a drilling rig are replaced or rebuilt. We spend significant funds each year on an ongoing program to modify and upgrade our drilling rigs to ensure that our drilling equipment is well maintained and competitive. During fiscal years 2005, 2004 and 2003, we spent approximately $329 million, $141 million and $77 million, respectively, on capital improvements to modify and upgrade our drilling rigs.
      Depth of the well and drill site conditions are the principal factors in determining the size of drilling rig used for a particular job. We use our rigs for developmental and exploratory drilling and they are capable of vertical or horizontal drilling.
      Our contract drilling operations depend on the availability of:
  •  drill pipe,
 
  •  bits,
 
  •  replacement parts and other related rig equipment,
 
  •  fuel, and
 
  •  qualified personnel,
some of which have been in short supply from time to time.
      Drilling Contracts — Most of our drilling contracts are with established customers on a competitive bid or negotiated basis. Typically, the contracts are short-term to drill a single well or a series of wells. Customer demand for drilling contracts with a term of one or more years increased during 2005 due to the scarcity of available drilling rigs in the market place. In response to this demand, we entered into several long-term contracts in 2005, typically with a term of one year. We may continue to enter into long-term contracts when considered beneficial to the Company.
      The drilling contracts obligate us to provide and operate a drilling rig and to pay certain operating expenses, including wages of drilling personnel and necessary maintenance expenses. The contracts are generally subject to termination by the customer on short notice. We generally indemnify our customers against claims by our employees and claims that might arise from surface pollution caused by spills of fuel, lubricants and other solvents within our control. The customers generally indemnify us against claims that

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might arise from other surface and subsurface pollution, except claims that might arise from our gross negligence.
      The contracts provide for payment on a daywork, footage, or turnkey basis, or a combination thereof. In each case, we provide the rig and crews. Our bid for each contract depends upon:
  •  location, depth and anticipated complexity of the well,
 
  •  on-site drilling conditions,
 
  •  equipment to be used,
 
  •  estimated risks involved,
 
  •  estimated duration of the job,
 
  •  availability of drilling rigs, and
 
  •  other factors particular to each proposed well.
Daywork Contracts
      Under daywork contracts, we provide the drilling rig and crew to the customer. The customer supervises the drilling of the well. Our compensation is based on a contracted rate per day during the period the drilling rig is utilized. In the past we generally received a lower rate when the drilling rig was moving, or when drilling operations were interrupted or restricted by conditions beyond our control. Current market conditions have enabled us to receive rates at or near current daywork dayrates in many of these situations. In addition, daywork contracts typically provide separately for mobilization of the drilling rig.
Footage Contracts
      Under footage contracts, we contract to drill a well to a certain depth under specified conditions for a fixed price per foot. The customer provides drilling fluids, casing, cementing and well design expertise. These contracts require us to bear the cost of services and supplies that we provide until the well has been drilled to the agreed depth. If we drill the well in less time than estimated, we have the opportunity to improve our profits over those that would be attainable under a daywork contract. Profits are reduced and losses may be incurred if the well requires more days to drill to the contracted depth than estimated. Footage contracts generally contain greater risks for a drilling contractor than daywork contracts. Under footage contracts, the drilling contractor assumes certain risks associated with loss of the well from fire, blowouts and other risks. Due to current market conditions and improved rates received under daywork contracts, we are entering into fewer footage contracts than we did in the past.
Turnkey Contracts
      Under turnkey contracts, we contract to drill a well to a certain depth under specified conditions for a fixed fee. In a turnkey arrangement, we are required to bear the costs of services, supplies and equipment beyond those typically provided under a footage contract. In addition to the drilling rig and crew, we are required to provide the drilling and completion fluids, casing, cementing, and the technical well design and engineering services during the drilling process. We also assume certain risks associated with drilling the well such as fires, blowouts, cratering of the well bore and other such risks. Compensation occurs only when the agreed scope of the work has been completed which requires us to make larger up-front working capital commitments prior to receiving payments under a turnkey drilling contract. Under a turnkey contract, we have the opportunity to improve our profits if the drilling process goes as expected and there are no complications or time delays. However, given the increased exposure we have under a turnkey contract, profits can be significantly reduced and losses incurred if complications or delays occur during the drilling process. Turnkey contracts generally involve the highest degree of risk among the three different types of drilling contracts: daywork, footage and turnkey. Due to current market conditions and improved rates received under daywork contracts, we are entering into fewer turnkey contracts than we did in the past.

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      Revenues by Contract Type — Information regarding our contract drilling activity for the last three years follows:
                         
    Years Ended December 31,
     
Type of Revenues   2005   2004   2003
             
Daywork
    98 %     88 %     83 %
Footage
    1       6       7  
Turnkey
    1       6       10  
      Contract Drilling Activity — Information regarding our contract drilling activity for the last three years follows:
                         
    Years Ended December 31,
     
    2005   2004   2003
             
Average rigs owned
    397       359       336  
Average rigs operating(1)
    276       211       188  
Average rig utilization rate
    69 %     59 %     56 %
Number of rigs operated
    307       259       226  
Number of wells drilled
    4,594       3,534       3,017  
 
(1)  A rig is operating when it is drilling, being moved, assembled, dismantled or otherwise earning revenue under contract.
      Drilling Rigs and Related Equipment — Certain drilling rig information as of December 31, 2005 follows:
                           
Depth Rating (Ft.)   Mechanical   Electric   Total
             
4,000 to 9,999
    79             79  
10,000 to 11,999
    76       2       78  
12,000 to 14,999
    139       8       147  
15,000 to 30,000
    67       32       99  
                   
 
Totals
    361       42       403  
                   
      At December 31, 2005, we owned 390 trucks and 467 trailers used to rig down, transport and rig up our drilling rigs. This reduces our dependency upon third parties for these services and enhances the efficiency of our contract drilling operations particularly in periods of high drilling rig utilization.
      Most repair and overhaul work to our drilling rig equipment is performed at our yard facilities located in Texas, New Mexico, Oklahoma, Utah and Western Canada.
Pressure Pumping Operations
      General — We provide pressure pumping services to oil and natural gas operators primarily in the Appalachian Basin. Pressure pumping services are primarily well stimulation and cementing for the completion of new wells and remedial work on existing wells. Most wells drilled in the Appalachian Basin require some form of fracturing or other stimulation to enhance the flow of oil and natural gas by pumping fluids under pressure into the well bore. Generally, Appalachian Basin wells require cementing services before production commences. The cementing process inserts material between the wall of the well bore and the casing to center and stabilize the casing.
      Equipment — Our pressure pumping equipment at December 31, 2005 follows:
  •  30 cement pumper trucks,
 
  •  33 fracturing pumper trucks,
 
  •  30 nitrogen pumper trucks,

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  •  17 blender trucks,
 
  •  10 bulk acid trucks,
 
  •  37 bulk cement trucks,
 
  •  10 bulk nitrogen trucks,
 
  •  42 bulk sand trucks,
 
  •  15 connection trucks, and
 
  •  2 acid pumper trucks.
Drilling and Completion Fluids Operations
      General — We provide drilling fluids, completion fluids and related services to oil and natural gas operators offshore in the Gulf of Mexico and on land in Texas, Southeastern New Mexico, Oklahoma and the Gulf Coast region of Louisiana. We serve our offshore customers through six stockpoint facilities located along the Gulf of Mexico in Texas and Louisiana and our land-based customers through eleven stockpoint facilities in Texas, Louisiana, Oklahoma and New Mexico.
      Drilling Fluids — Drilling fluid products and systems are used to cool and lubricate the bit during drilling operations, contain formation pressures (thereby minimizing blowout risk), suspend and remove rock cuttings from the hole and maintain the stability of the wellbore. Technical services are provided to ensure that the products and systems are applied effectively to optimize drilling operations.
      Completion Fluids — After a well is drilled, the well casing is set and cemented into place. At that point, the drilling fluid services are complete and the drilling fluids are circulated out of the well and replaced with completion fluids. Completion fluids, also known as clear brine fluids, are solids-free, clear salt solutions that have high specific gravities. Combined with a range of specialty chemicals, these fluids are used to control bottom-hole pressures and to meet specific corrosion, inhibition, viscosity and fluid loss requirements.
      Raw Materials — Our drilling and completion fluids operations depend on the availability of the following raw materials:
  Drilling
  barite and bentonite
  Completion
  calcium chloride, calcium bromide and zinc bromide
      We obtain these raw materials through purchases made on the spot market and supply contracts with producers of these raw materials.
      Barite Grinding Facility — We own and operate a barite grinding facility with two barite grinding mills in Houma, Louisiana. This facility allows us to grind raw barite into the powder additive used in drilling fluids.
      Other Equipment — We own 24 trucks and 79 trailers and lease another 24 trucks which are used to transport drilling and completion fluids and related equipment.
Oil and Natural Gas Operations
      General — We are engaged in the development, exploration, acquisition and production of oil and natural gas. Our oil and natural gas business operates primarily in producing regions of West and South Texas, Southeastern New Mexico, Utah and Mississippi. We significantly expanded our oil and natural gas operations in 2004 through our acquisition of TMBR/ Sharp Drilling, Inc. (“TMBR”). The oil and natural gas assets acquired in the acquisition of TMBR included both proved reserves and undeveloped properties.

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Customers
      The customers of each of our four business segments are oil and natural gas operators or purchasers of these commodities. Our customer base includes both major and independent oil and natural gas operators. During 2005, no single customer accounted for 10% or more of our consolidated operating revenues.
Competition
      Contract Drilling and Pressure Pumping Businesses — Our land drilling and pressure pumping businesses are highly competitive. Often times, available land drilling rigs and pressure pumping equipment exceed the demand for such equipment. The equipment can also be moved from one market to another in response to market conditions.
      Drilling and Completion Fluids Business — The drilling and completion fluids industry is highly competitive and price is generally the most important factor. Other competitive factors include the availability of chemicals and experienced personnel, the reputation of the fluids services provider in the drilling industry and relationships with customers. Some of our competitors have substantially more resources and longer operating histories than we have.
      Oil and Natural Gas Business — There is substantial competition for the acquisition of oil and natural gas leases suitable for development and exploration and for experienced personnel. Our competitors in this business include:
  •  major integrated oil and natural gas operators,
 
  •  independent oil and natural gas operators, and
 
  •  drilling and production purchase programs.
      Our ability to increase our oil and natural gas reserves in the future is directly dependent upon our ability to select, acquire and develop suitable prospects. Many of our competitors have facilities and financial and human resources greater than ours.
Government and Environmental Regulation
      All of our operations and facilities are subject to numerous Federal, state, foreign, and local laws, rules and regulations related to various aspects of our business, including:
  •  drilling of oil and natural gas wells,
 
  •  containment and disposal of hazardous materials, oilfield waste, other waste materials and acids,
 
  •  use of underground storage tanks, and
 
  •  use of underground injection wells.
      To date, applicable environmental laws and regulations have not required the expenditure of significant resources. We do not anticipate any material capital expenditures for environmental control facilities or extraordinary expenditures to comply with environmental rules and regulations in the foreseeable future. However, compliance costs under existing laws or under any new requirements could become material and we could incur liability in any instance of noncompliance.
      Our business is generally affected by political developments and by Federal, state, foreign, and local laws and regulations, which relate to the oil and natural gas industry. The adoption of laws and regulations affecting the oil and natural gas industry for economic, environmental and other policy reasons could increase costs relating to drilling and production. They could have an adverse effect on our operations. Several state and Federal environmental laws and regulations currently apply to our operations and may become more stringent in the future.
      We use operating and disposal practices that are standard in the industry. However, hydrocarbons and other materials may have been disposed of or released in or under properties currently or formerly owned or

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operated by us or our predecessors. In addition, some of these properties have been operated by third parties over whom we have no control of their treatment of hydrocarbon and other materials or the manner in which they may have disposed of or released such materials.
      The Federal Comprehensive Environmental Response Compensation and Liability Act of 1980, as amended, commonly known as CERCLA, and comparable state statutes impose strict liability on:
  •  owners and operators of sites, and
 
  •  persons who disposed of or arranged for the disposal of “hazardous substances” found at sites.
      The Federal Resource Conservation and Recovery Act (“RCRA”), as amended, and comparable state statutes govern the disposal of “hazardous wastes.” Although CERCLA currently excludes petroleum from the definition of “hazardous substances,” and RCRA also excludes certain classes of exploration and production wastes from regulation, such exemptions by Congress under both CERCLA and RCRA may be deleted, limited, or modified in the future. If such changes are made to CERCLA and/or RCRA, we could be required to remove and remediate previously disposed of materials (including materials disposed of or released by prior owners or operators) from properties (including ground water contaminated with hydrocarbons) and to perform removal or remedial actions to prevent future contamination.
      The Federal Water Pollution Control Act and the Oil Pollution Act of 1990, as amended, and implementing regulations govern:
  •  the prevention of discharges, including oil and produced water spills, and
 
  •  liability for drainage into waters.
      The Oil Pollution Act is more comprehensive and stringent than previous oil pollution liability and prevention laws. It imposes strict liability for a comprehensive and expansive list of damages from an oil spill into waters from facilities. Liability may be imposed for oil removal costs and a variety of public and private damages. Penalties may also be imposed for violation of Federal safety, construction and operating regulations, and for failure to report a spill or to cooperate fully in a clean-up.
      The Oil Pollution Act also expands the authority and capability of the Federal government to direct and manage oil spill clean-up and operations, and requires operators to prepare oil spill response plans in cases where it can reasonably be expected that substantial harm will be done to the environment by discharges on or into navigable waters. We have spill prevention control and countermeasure plans in place for our oil and natural gas properties in each of the areas in which we operate and for each of the stockpoints operated by our drilling and completion fluids business. Failure to comply with ongoing requirements or inadequate cooperation during a spill event may subject a responsible party, such as us, to civil or criminal actions. Although the liability for owners and operators is the same under the Federal Water Pollution Act, the damages recoverable under the Oil Pollution Act are potentially much greater and can include natural resource damages.
      Our operations are also subject to Federal, state and local regulations for the control of air emissions. The Federal Clean Air Act, as amended, and various state and local laws impose certain air quality requirements on us. Amendments to the Clean Air Act revised the definition of “major source” such that emissions from both wellhead and associated equipment involved in oil and natural gas production may be added to determine if a source is a “major source.” As a consequence, more facilities may become major sources and thus would be required to obtain operating permits. This permitting process may require capital expenditures in order to comply with permit limits.
Risks and Insurance
      Our operations are subject to the many hazards inherent in the drilling business, including:
  •  accidents at the work location,
 
  •  blow-outs,
 
  •  cratering,

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  •  fires, and
 
  •  explosions.
      These hazards could cause:
  •  personal injury or death,
 
  •  suspension of drilling operations, or
 
  •  serious damage or destruction of the equipment involved and, in addition to environmental damage, could cause substantial damage to producing formations and surrounding areas.
      Damage to the environment, including property contamination in the form of either soil or ground water contamination, could also result from our operations, particularly through:
  •  oil or produced water spillage,
 
  •  natural gas leaks, and
 
  •  fires.
      In addition, we could become subject to liability for reservoir damages. The occurrence of a significant event, including pollution or environmental damages, could materially affect our operations and financial condition.
      As a protection against operating hazards, we maintain insurance coverage we believe to be adequate, including:
  •  all-risk physical damages,
 
  •  employer’s liability,
 
  •  commercial general liability, and
 
  •  workers compensation insurance.
      We believe that we are adequately insured for public liability and property damage to others with respect to our operations. However, such insurance may not be sufficient to protect us against liability for all consequences of:
  •  personal injury,
 
  •  well disasters,
 
  •  extensive fire damage,
 
  •  damage to the environment, or
 
  •  other hazards.
      We also carry insurance coverage for major physical damage to our drilling rigs. However, we do not carry insurance against loss of earnings resulting from such damage. In view of the difficulties that may be encountered in renewing such insurance at reasonable rates, no assurance can be given that:
  •  we will be able to maintain the type and amount of coverage that we believe to be adequate at reasonable rates, or
 
  •  any particular types of coverage will be available.
      In addition to insurance coverage, we also attempt to obtain indemnification from our customers for certain risks. These indemnity agreements typically require our customers to hold us harmless in the event of loss of production or reservoir damage. These contractual indemnifications may not be supported by adequate insurance maintained by the customer.

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Employees
      We employed approximately 8,600 full-time persons (450 office personnel and 8,150 field personnel) at December 31, 2005. The number of field employees fluctuates depending on the current and expected demand for our services. We consider our employee relations to be satisfactory. None of our employees are represented by a union.
Seasonality
      Seasonality does not significantly affect our overall operations. However, our pressure pumping division in Appalachia and our drilling operations in Canada are subject to slow periods of activity during the Spring thaw. In addition, our drilling operations in Canada are subject to slow periods of activity during the Fall.
Raw Materials and Subcontractors
      We use many suppliers of raw materials and services. These materials and services have historically been available, although there is no assurance that such materials and services will continue to be available on favorable terms or at all. We also utilize numerous independent subcontractors from various trades.
Incorporation by Reference
      The various factors disclosed under the caption “Risk Factors,” beginning on page 11 of this Report, are incorporated by this reference into Items 1 and 2 of this Report. Readers of this Report should review those factors in conjunction with their review of this Report.
Item 1A. Risk Factors.
      From time to time, we make written or oral forward-looking statements, including statements contained in this Annual Report on Form 10-K, our other filings with the SEC, press releases and reports to stockholders. These forward-looking statements are made pursuant to the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995. These statements include, without limitation, statements relating to liquidity, financing of operations, sources and sufficiency of funds and impact of inflation. The words “believes,” “budgeted,” “expects,” “project,” “will,” “could,” “may,” “plans,” “intends,” “strategy,” or “anticipates,” and similar expressions are used to identify our forward-looking statements. We do not undertake to update, revise, or correct any of our forward-looking information.
      We include the following cautionary statement in accordance with the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995 for any forward-looking statement made by us, or on our behalf. The factors identified in this cautionary statement are important factors (but not necessarily all of the important factors) that could cause actual results to differ materially from those expressed in any forward-looking statement made by us, or on our behalf. Where any such forward-looking statement includes a statement of the assumptions or bases underlying such forward-looking statement, we caution that, while we believe such assumptions or bases to be reasonable and make them in good faith, assumed facts or bases almost always vary from actual results. The differences between assumed facts or bases and actual results can be material, depending upon the circumstances.
      Where, in any forward-looking statement, we express an expectation or belief as to the future results, such expectation or belief is expressed in good faith and believed to have a reasonable basis. However, there can be no assurance that the statement of expectation or belief will result, or be achieved or accomplished.

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Taking this into account, the following are identified as important risk factors currently applicable to, or which could readily be applicable to, us:
We are Dependent on the Oil and Natural Gas Industry and Market Prices for Oil and Natural Gas. Declines in Oil and Natural Gas Prices Have Adversely Affected Our Operations.
      Our revenue, profitability and rate of growth are substantially dependent upon prevailing prices for oil and natural gas. For many years, oil and natural gas prices and, therefore, the level of drilling, exploration, development and production, have been extremely volatile. Prices are affected by:
  •  market supply and demand,
 
  •  international military, political and economic conditions, and
 
  •  the ability of the Organization of Petroleum Exporting Countries, commonly known as OPEC, to set and maintain production and price targets.
      All of these factors are beyond our control. Natural gas prices fell from an average of $6.23 per Mcf in the first quarter of 2001 to an average of $2.51 per Mcf for the same period in 2002. During this same period, the average number of our rigs operating dropped by approximately 50%. The average market price of natural gas improved from $3.36 in 2002 to $8.98 in 2005 resulting in an increase in demand for our drilling services. Our average number of rigs operating increased from 126 in 2002 to 276 in 2005. We expect oil and natural gas prices to continue to be volatile and to affect our financial condition and operations and ability to access sources of capital. A significant decrease in expected market prices for natural gas could result in a material decrease in demand for drilling rigs and reduction in our operating results.
A General Excess of Operable Land Drilling Rigs Adversely Affects Our Profit Margins Particularly in Times of Weaker Demand.
      The North American land drilling industry has experienced periods of downturn in demand over the last decade. During these periods, there have been substantially more drilling rigs available than necessary to meet demand. As a result, drilling contractors have had difficulty sustaining profit margins during the downturn periods.
      In addition to adverse effects that future declines in demand could have on us, ongoing factors which could adversely affect utilization rates and pricing, even in an environment of high oil and natural gas prices and increased drilling activity, include:
  •  movement of drilling rigs from region to region,
 
  •  reactivation of land-based drilling rigs, or
 
  •  construction of new drilling rigs.
      We cannot predict either the future level of demand for our contract drilling services or future conditions in the oil and natural gas contract drilling business.
Shortages of Drill Pipe, Replacement Parts and Other Related Rig Equipment Adversely Affects Our Operating Results.
      During periods of increased demand for drilling services, the industry has experienced shortages of drill pipe, replacement parts and other related rig equipment. These shortages can cause the price of these items to increase significantly and require that orders for the items be placed well in advance of expected use. These price increases and delays in delivery may require us to increase capital and repairs expenditures in our contract drilling segment. Severe shortages could impair our ability to operate our drilling rigs.

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The Various Business Segments in Which We Operate Are Highly Competitive with Excess Capacity which may Adversely Affect Our Operating Results.
      Our land drilling and pressure pumping businesses are highly competitive. While not the conditions at present, often times, available land drilling rigs and pressure pumping equipment exceed the demand for such equipment. This excess capacity has resulted in substantial competition for drilling and pressure pumping contracts. The fact that drilling rigs and pressure pumping equipment are mobile and can be moved from one market to another in response to market conditions heightens the competition in the industry.
      We believe that price competition for drilling and pressure pumping contracts will continue for the foreseeable future due to the existence of available rigs and pressure pumping equipment.
      In recent years, many drilling and pressure pumping companies have consolidated or merged with other companies. Although this consolidation has decreased the total number of competitors, we believe the competition for drilling and pressure pumping services will continue to be intense.
      The drilling and completion fluids services industry is highly competitive. Price is generally the most important factor. Other competitive factors include the availability of chemicals and experienced personnel, the reputation of the fluids services provider in the drilling industry and relationships with customers. Some of our competitors have substantially more resources and longer operating histories than we have.
Labor Shortages Adversely Affect Our Operating Results.
      During periods of increasing demand for contract drilling services, the industry experiences shortages of qualified drilling rig personnel. During these periods, our ability to attract and retain sufficient qualified personnel to market and operate our drilling rigs is adversely affected which negatively impacts both our operations and profitability. Operationally, it is more difficult to hire qualified personnel which adversely affects our ability to mobilize inactive rigs in response to the increased demand for our contract drilling services. Additionally, wage rates for drilling personnel are likely to increase, resulting in greater operating costs.
Continued Growth Through Rig Acquisition is Not Assured.
      We have increased our drilling rig fleet over the past several years through mergers and acquisitions. The land drilling industry has experienced significant consolidation over the past several years, and there can be no assurance that acquisition opportunities will continue to be available. Additionally, we are likely to continue to face intense competition from other companies for available acquisition opportunities.
      There can be no assurance that we will:
  •  have sufficient capital resources to complete additional acquisitions,
 
  •  successfully integrate acquired operations and assets,
 
  •  effectively manage the growth and increased size,
 
  •  successfully deploy idle or stacked rigs,
 
  •  maintain the crews and market share to operate drilling rigs acquired, or
 
  •  successfully improve our financial condition, results of operations, business or prospects in any material manner as a result of any completed acquisition.
      We may incur substantial indebtedness to finance future acquisitions and also may issue equity securities or convertible securities in connection with any such acquisitions. Debt service requirements could represent a significant burden on our results of operations and financial condition and the issuance of additional equity would be dilutive to existing stockholders. Also, continued growth could strain our management, operations, employees and other resources.

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The Nature of our Business Operations Presents Inherent Risks of Loss that, if not Insured or Indemnified Against, Could Adversely Affect Our Operating Results.
      Our operations are subject to many hazards inherent in the contract drilling, pressure pumping, and drilling and completion fluids businesses, which in turn could cause personal injury or death, work stoppage, or serious damage to our equipment. Our operations could also cause environmental and reservoir damages. We maintain insurance coverage and have indemnification agreements with many of our customers. However, there is no assurance that such insurance or indemnification agreements would adequately protect us against liability or losses from all consequences of the hazards. Additionally, there can be no assurance that insurance would be available to cover any or all of these risks, or, even if available, that insurance premiums or other costs would not rise significantly in the future, so as to make such insurance prohibitive.
      We have elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. For example, we maintain a $1.0 million per occurrence deductible on our workers’ compensation insurance and our general liability insurance coverages. These levels of self-insurance expose us to increased operating costs and risks.
Violations of Environmental Laws and Regulations Could Materially Adversely Affect Our Operating Results.
      The drilling of oil and natural gas wells is subject to various Federal, state, foreign, and local laws, rules and regulations. The cost of compliance with these laws and regulations could be substantial. Failure to comply with these requirements could expose us to substantial civil and criminal penalties. In addition, Federal law imposes a variety of regulations on “responsible parties” related to the prevention of oil spills and liability for damages from such spills. As an owner and operator of land-based drilling rigs, we may be deemed to be a responsible party under Federal law. Our operations and facilities are subject to numerous state and Federal environmental laws, rules and regulations, including, without limitation, laws concerning the containment and disposal of hazardous substances, oil field waste and other waste materials, the use of underground storage tanks and the use of underground injection wells.
Some of Our Contract Drilling Services are Done Under Turnkey and Footage Contracts, Which are Financially Risky.
      A portion of our contract drilling is performed under turnkey and footage contracts, which involve significant risks. Under turnkey drilling contracts, we contract to drill a well to a certain depth under specified conditions at a fixed price. Under footage contracts, we contract to drill a well to a certain depth under specified conditions at a fixed price per foot. The risk to us under these types of drilling contracts are greater than on a well drilled on a daywork basis. Unlike daywork contracts, we must bear the cost of services until the target depth is reached. In addition, we must assume most of the risk associated with the drilling operations, generally assumed by the operator of the well on a daywork contract, including blowouts, loss of hole from fire, machinery breakdowns and abnormal drilling conditions. Accordingly, if severe drilling problems are encountered in drilling wells under such contracts, we could suffer substantial losses.
Anti-takeover Measures in Our Charter Documents and Under State Law Could Discourage an Acquisition and Thereby Affect the Related Purchase Price.
      We are a Delaware corporation subject to the Delaware General Corporation Law, including Section 203, an anti-takeover law enacted in 1988. We have also enacted certain anti-takeover measures, including a stockholders’ rights plan. In addition, our Board of Directors has the authority to issue up to one million shares of preferred stock and to determine the price, rights (including voting rights), conversion ratios, preferences and privileges of that stock without further vote or action by the holders of the common stock. As a result of these measures and others, potential acquirers might find it more difficult or be discouraged from attempting to effect an acquisition transaction with us. This may deprive holders of our securities of certain opportunities to sell or otherwise dispose of the securities at above-market prices pursuant to any such transactions.

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Item 1B. Unresolved Staff Comments.
      None.
Item 2. Properties
      Our corporate headquarters are located in Snyder, Texas. We also have a number of offices, yards and stockpoint facilities located in our various operating areas.
      Our corporate headquarters are located at 4510 Lamesa Highway, Snyder, Texas, and our telephone number at that address is (325) 574-6300. There are a number of improvements at our headquarters, including:
  •  office buildings with approximately 37,000 square feet of office space and storage,
 
  •  a shop facility with approximately 7,000 square feet used for drilling equipment repairs and metal fabrication,
 
  •  a truck shop facility with approximately 10,000 square feet used to maintain, overhaul and repair our truck fleet,
 
  •  a truck fabrication and rigup shop with approximately 3,000 square feet used to prepare new trucks for service,
 
  •  an engine shop facility with approximately 20,000 square feet used to overhaul and repair the engines that power our drilling rigs, and
 
  •  an open-ended metal storage facility with approximately 10,000 square feet.
      We have regional administrative offices, yards and stockpoint facilities in many of the areas in which we operate. The facilities are primarily used to support day-to-day operations, including the repair and maintenance of equipment as well as the storage of equipment, inventory and supplies and to facilitate administrative responsibilities and sales.
      Contract Drilling Operations — Our drilling services are supported by several administrative offices and yard facilities located throughout our areas of operations including:
  •  Texas,
 
  •  New Mexico,
 
  •  Oklahoma,
 
  •  Colorado,
 
  •  Utah,
 
  •  Wyoming, and
 
  •  Western Canada.
      Pressure Pumping — Our pressure pumping services are supported by several offices and yard facilities located throughout our areas of operations including:
  •  Pennsylvania,
 
  •  Ohio,
 
  •  West Virginia,
 
  •  Kentucky,
 
  •  Tennessee, and
 
  •  Wyoming.

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      Drilling and Completion Fluids — Our drilling and completion fluids services are supported by several administrative offices and stockpoint facilities located throughout our areas of operations including:
  •  Texas,
 
  •  Louisiana,
 
  •  New Mexico, and
 
  •  Oklahoma.
      Oil and Natural Gas — Our oil and natural gas operations are supported by administrative and field offices in Texas.
      We own our headquarters in Snyder, Texas, as well as several of our other facilities. We also lease a number of facilities and we do not believe that any one of the leased facilities is individually material to our operations. We believe that our existing facilities are suitable and adequate to meet our needs.
Item 3. Legal Proceedings.
      In December 2005, two purported derivative actions were filed in Texas state court in Scurry County, Texas, against our directors, alleging that the directors breached their fiduciary duties to us as a result of alleged failure to timely discover the embezzlement by Nelson, and against our principal accounting firm, PricewaterhouseCoopers LLP, alleging that such firm committed negligence and malpractice as a result of alleged failure to timely discover the embezzlement. The Board of Directors formed a special litigation committee to review and inquire about these allegations and recommend our response, if any. Further legal proceedings in these suits have been stayed pending completion of the work of the special litigation committee. The lawsuits seek recovery on behalf of and for us and do not seek recovery from us.
      We are party to various other legal proceedings arising in the normal course of our business. We do not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on our financial condition.
Item 4. Submission of Matters to a Vote of Security Holders.
      None.

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PART II
Item 5. Market for Registrant’s Common Equity and Related Stockholder Matters and Issuer Purchases of Equity Securities.
     (a)  Market Information
      Our common stock, par value $0.01 per share, is publicly traded on the Nasdaq National Market and is quoted under the symbol “PTEN.” Our common stock is included in the S&P MidCap 400 Index and several other market indexes. The following table provides high and low sales prices of our common shares for the periods indicated, adjusted to reflect the two-for-one stock split on June 30, 2004:
                 
    High   Low
         
2005:
               
First quarter
  $ 26.66     $ 17.15  
Second quarter
    29.33       22.38  
Third quarter
    36.79       27.79  
Fourth quarter
    36.73       28.45  
2004:
               
First quarter
  $ 19.20     $ 15.75  
Second quarter
    19.56       14.52  
Third quarter
    19.88       15.69  
Fourth quarter
    20.45       17.85  
     (b)  Holders
      As of March 10, 2006, there were approximately 2,174 holders of record and approximately 92,452 beneficial holders of our common shares.
     (c)  Dividends and Buyback Program
      On April 28, 2004, our Board of Directors approved the initiation of a quarterly cash dividend of $0.02 on each share of our common stock which was paid on June 2, 2004. Quarterly cash dividends in the amount of $0.02 per share were also paid on September 1, 2004 and December 1, 2004. Total cash dividends paid in 2004 were approximately $10 million. In February 2005, our Board of Directors approved an increase in the quarterly cash dividend on our common stock to $0.04 per share from $0.02 per share. Quarterly cash dividends in the amount of $0.04 per share were paid on March 4, 2005, June 1, 2005, September 1, 2005 and December 1, 2005. Total cash dividends in 2005 were approximately $27.3 million. The next quarterly cash dividend is to be paid to holders of record on March 15, 2006 and paid on March 30, 2006. The amount and timing of all future dividend payments is subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial conditions, terms of our credit facilities and other factors.
      On April 28, 2004, our Board of Directors authorized a two-for-one stock split in the form of a stock dividend which was distributed on June 30, 2004.

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      The table below sets forth the information with respect to purchases of our common stock made by or on our behalf during the quarter ended December 31, 2005.
                                 
            Total number   Maximum number
            of shares (or   (or approximate dollar
            units) purchased   value) of shares
    Total number       as part of publicly   (or units) that may
    of shares   Average price   announced plans   yet be purchased under
Period covered   purchased(1)   paid per share   or programs(2)   the plans or programs(2)
                 
October 1–31, 2005
        $           $ 28,518,216  
November 1–30, 2005
    355,000     $ 34.23       355,000     $ 16,364,873  
December 1–31, 2005
        $           $ 16,364,873  
                         
Total
    355,000     $ 34.23       355,000     $ 16,364,873  
                         
 
(1)  All of the reported shares were purchased in open-market transactions.
 
(2)  On June 7, 2004, our Board of Directors authorized a stock buyback program for the purchase of up to $30 million of our outstanding common stock, which repurchases may be made from time to time as, in the opinion of management, market conditions warrant, in the open market or in privately negotiated transactions. On March 27, 2006, our Board of Directors increased the stock buyback program to allow the future purchases of up to $200 million of our outstanding common stock.
     (d)  Securities Authorized for Issuance Under Equity Compensation Plans
      Equity compensation to our employees, officers and directors as of December 31, 2005 follows:
                           
    Equity Compensation Plan Information
     
        Number of
    Number of       Securities
    Securities to   Weighted-   Remaining Available
    be Issued upon   Average Exercise   for Future Issuance
    Exercise of   Price of   under Equity
    Outstanding   Outstanding   Compensation Plans
    Options,   Options,   (Excluding
    Warrants and   Warrants and   Securities Reflected
Plan Category   Rights   Rights   in Column(a))
             
    (a)   (b)   (c)
Equity compensation plans approved by security holders
    5,449,739     $ 15.11       5,464,217 (1)
Equity compensation plans not approved by security holders(2)
    888,304     $ 9.87        
                   
 
Total
    6,338,043     $ 14.37       5,464,217  
                   
 
(1)  The Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (the “2005 Plan”) provides for awards of incentive stock options, non-incentive stock options, tandem and freestanding stock appreciation rights, restricted stock awards, other stock unit awards, performance share awards, performance unit awards and dividend equivalents to key employees, officers and directors, which are subject to certain vesting and forfeiture provisions. All options are granted with an exercise price equal to or greater than the fair market value of the common stock at the time of grant. The vesting schedule and term are set by the Compensation Committee of the Board of Directors. All securities remaining available for future issuance under equity compensation plans approved by security holders in column (c) are available under this plan.

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(2)  The Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (the “2001 Plan”) was approved by the Board of Directors in July 2001. In connection with the approval of the 2005 Plan, the Board of Directors approved a resolution that no further options, restricted stock or other awards would be granted under any equity compensation plan, other than the 2005 Plan. The terms of the 2001 Plan provided for grants of stock options, stock appreciation rights, shares of restricted stock and performance awards to eligible employees other than officers and directors. No Incentive Stock Options could be awarded under the Plan. All options were granted with an exercise price equal to or greater than the fair market value of the common stock at the time of grant. The vesting schedule and term were set by the Compensation Committee of the Board of Directors.

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Item 6. Selected Financial Data.
      Our selected consolidated financial data as of December 31, 2005, 2004, 2003, 2002 and 2001, and for each of the five years then ended should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the Consolidated Financial Statements and related Notes thereto, included as Items 7 and 8, respectively, of this Report. The historical financial data presented below was previously reported as restated to provide for (i) the retroactive effect of the merger with UTI Energy Corp., on May 8, 2001 accounted for as a pooling of interest; (ii) the retroactive application of the equity method of accounting for our investment in TMBR and (iii) a two-for-one stock split that occurred in 2004. The current and historical financial data presented below has been further restated to provide for, net of related tax effects, (i) the effects of losses incurred as a result of the embezzlement and (ii) the effects of the correction of other errors that are immaterial both individually and in the aggregate. See additional information about the embezzlement and restatement in footnote (1) to the restated selected financial data below. Certain reclassifications have been made to the historical financial data to conform with the 2004 presentation.
                                             
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003   2002   2001
                     
    (In thousands)
Income Statement Data:
                                       
Operating revenues:
                                       
 
Contract drilling
  $ 1,485,684     $ 809,691     $ 639,694     $ 410,295     $ 839,931  
 
Pressure pumping
    93,144       66,654       46,083       32,996       39,600  
 
Drilling and completion fluids
    122,011       90,557       69,230       69,943       94,456  
 
Oil and natural gas
    39,616       33,867       21,163       14,723       15,988  
                               
   
Total
    1,740,455       1,000,769       776,170       527,957       989,975  
                               
Operating costs and expenses:
                                       
 
Contract drilling
    776,313       556,869       475,224       318,201       487,343  
 
Pressure pumping
    54,956       37,561       26,184       19,802       21,146  
 
Drilling and completion fluids
    98,530       76,503       61,424       60,762       80,034  
 
Oil and natural gas
    9,566       7,978       4,808       3,956       5,190  
 
Depreciation, depletion, amortization and impairment
    156,393       122,800       100,834       92,778       86,035  
 
Selling, general and administrative
    39,110       31,983       27,685       26,116       28,462  
 
Bad debt expense
    1,231       897       259       320       2,045  
 
Merger costs
                            5,943  
 
Restructuring and other charges
                            7,202  
 
Embezzled funds and related expenses
    20,043       19,122       17,849       8,574       7,674  
 
Other (including gain or loss on sale of assets)
    3,017       (1,411 )     (4,379 )     4,340       (820 )
                               
   
Total
    1,159,159       852,302       709,888       534,849       730,254  
                               
Operating income (loss)
    581,296       148,467       66,282       (6,892 )     259,721  
Other income (expense)
    3,463       680       2,694       803       (677 )
                               
Income (loss) before income taxes and cumulative effect of change in accounting principle
    584,759       149,147       68,976       (6,089 )     259,044  
Income tax expense (benefit)
    212,019       54,801       25,320       (1,949 )     99,472  
                               
Income (loss) before cumulative effect of change in accounting principle
    372,740       94,346       43,656       (4,140 )     159,572  
Cumulative effect of change in accounting principle, net of related income tax benefit of approximately $287
                (469 )            
                               
Net income (loss)
  $ 372,740     $ 94,346     $ 43,187     $ (4,140 )   $ 159,572  
                               

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    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003   2002   2001
                     
    (In thousands, except per share amounts)
Net income (loss) per common share:
                                       
 
Basic:
                                       
   
Income (loss) before cumulative effect of change in accounting principle
  $ 2.19     $ 0.57     $ 0.27     $ (0.03)     $ 1.04  
                               
   
Cumulative effect of change in accounting principle
  $     $     $     $     $  
                               
   
Net income (loss)
  $ 2.19     $ 0.57     $ 0.27     $ (0.03)     $ 1.04  
                               
 
Diluted:
                                       
   
Income (loss) before cumulative effect of change in accounting principle
  $ 2.15     $ 0.56     $ 0.27     $ (0.03)     $ 1.01  
                               
   
Cumulative effect of change in accounting principle
  $     $     $     $     $  
                               
   
Net income (loss)
  $ 2.15     $ 0.56     $ 0.26     $ (0.03)     $ 1.01  
                               
Cash dividends per common share
  $ 0.16     $ 0.06     $     $     $  
                               
Weighted average number of common shares outstanding:
                                       
 
Basic
    170,426       166,258       161,272       157,410       152,814  
                               
 
Diluted
    173,767       169,211       164,572       157,410       158,394  
                               
Balance Sheet Data:
                                       
Total assets
  $ 1,795,781     $ 1,256,785     $ 1,039,521     $ 919,374     $ 856,855  
Stockholders’ equity
    1,367,011       961,501       789,814       724,248       680,341  
Working capital
    382,448       235,480       198,399       166,885       109,566  
 
(1)  On November 3, 2005, we announced the resignation of our CFO, Jonathan D. Nelson. On November 10, 2005, we announced that, based on information received by Company senior management on November 9, 2005, the Audit Committee of our Board of Directors began an investigation into an apparent embezzlement from us by Nelson.
  On December 22, 2005, upon recommendation of Company management and the Audit Committee of our Board of Directors, we announced that based on the results to date of the internal investigation into the facts and circumstances surrounding the embezzlement by Nelson, we would restate previously issued financial statements and amend our previously issued Annual Report on Form 10-K for the year ended December 31, 2004 and Quarterly Reports on Form 10-Q for the periods ended March 31, June 30 and September 30, 2005. These restatements reflect losses incurred as a result of payments made to or for the benefit of Nelson that had been recognized in our accounting records and previously issued financial statements as payments for assets and services that we did not receive. Previously issued financial statements have also been restated for the effects of the correction of other errors that are immaterial both individually and in the aggregate. These other adjustments relate primarily to previously reported property and equipment balances that resulted from our review of our property and equipment records and the underlying physical assets in connection with investigation of the embezzlement. We have restated such financial statements, and on March 17, 2006, we filed our amended Annual Report on Form 10-K/A and on March 27, 2006, we filed our amended Quarterly Reports on Form 10-Q/A with the SEC.

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Most of the embezzled funds result from Nelson causing the wiring of Company funds aggregating approximately $72.3 million, to, or for the benefit of, entities owned and controlled by him. Nelson was originally able to initiate these wire transfers by requesting the wire transfers himself in telephone calls to one of the Company’s banks. After changes to the Company’s internal controls and procedures in 2004, Nelson initiated the wire transfers through instructions to one of his subordinates and by the creation of fraudulent invoices containing forged senior management approvals. This false documentation was created by Nelson to conceal the true nature of these transactions from the Company and its independent registered public accountants.
Nelson also instructed certain former employees, who worked under his supervision, to alter management reports related to property and equipment expenditures. Nelson also created fictitious property and equipment approval forms with forged signatures.
  The total amount embezzled was approximately $77.5 million in cash, excluding any tax effects, beginning with the year ended December 31, 1998 through November 3, 2005 as follows (in thousands):
             
       From 1998 to December 31, 2004
  $ 58,961  
       From January 1, 2005 to September 30, 2005(1)
    12,193  
       
 
      Total through September 30, 2005
    71,154  
       From October 1, 2005 to November 3, 2005 (net of $1,500 repayment)(1)
    6,350  
       
   
        Total embezzlement
  $ 77,504  
       
 
(1)  The total amount embezzled during 2005 was $18,543,000 and the Company incurred $1,500,000 of professional fees and expenses as a result of the embezzlement. Accordingly, the total embezzled funds and related expenses in 2005 were $20,043,000.
  The effects of the restatement due to the embezzlement and other adjustments on operating income as previously reported for 2004 and prior years follow:
                                   
    Years Ended December 31,
     
    2004   2003   2002   2001
                 
    (In thousands)
Operating income (loss):
                               
 
As previously reported
  $ 171,214     $ 87,190     $ 3,398     $ 267,172  
 
Adjustment for effects of embezzlement
    (18,637 )     (17,375 )     (8,249 )     (7,461 )
 
Other adjustments
    (4,110 )     (3,533 )     (2,041 )     10  
                         
 
As restated
  $ 148,467     $ 66,282     $ (6,892 )   $ 259,721  
                         

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  The effects of the restatement due to the embezzlement and other adjustments on net income as previously reported for 2004 and prior years follow:
                                         
    Years Ended December 31,
     
    2004   2003   2002   2001
                 
    (In thousands, except per share data)
Net income (loss):
                               
   
As previously reported
  $ 108,733     $ 56,419     $ 2,374     $ 164,162  
                         
   
Adjustments:
                               
     
Embezzled funds expense
    (19,122 )     (17,849 )     (8,574 )     (7,674 )
     
Embezzlement amounts previously expensed as depreciation and selling, general and administrative
    485       474       325       213  
                         
     
Embezzlement expense, net of amounts previously expensed
    (18,637 )     (17,375 )     (8,249 )     (7,461 )
     
Other adjustments
    (4,110 )     (3,533 )     (2,041 )     10  
     
Tax benefits
    8,360       7,676       3,776       2,861  
                         
       
Net adjustment
    (14,387 )     (13,232 )     (6,514 )     (4,590 )
                         
   
Net income (loss) as restated
  $ 94,346     $ 43,187     $ (4,140 )   $ 159,572  
                         
Net income (loss) per common share:
                               
 
Basic:
                               
   
As previously reported
  $ 0.65     $ 0.35     $ 0.02     $ 1.07  
   
Adjustment for effects of embezzlement
  $ (0.07 )   $ (0.07 )   $ (0.03 )   $ (0.03 )
   
Other adjustments
  $ (0.02 )   $ (0.01 )   $ (0.01 )   $  
   
As restated
  $ 0.57     $ 0.27     $ (0.03 )   $ 1.04  
 
Diluted:
                               
   
As previously reported
  $ 0.64     $ 0.34     $ 0.01     $ 1.04  
   
Adjustment for effects of embezzlement
  $ (0.07 )   $ (0.07 )   $ (0.03 )   $ (0.03 )
   
Other adjustments
  $ (0.02 )   $ (0.01 )   $ (0.01 )   $  
   
As restated
  $ 0.56     $ 0.26     $ (0.03 )   $ 1.01  

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  The effects of the restatement due to the embezzlement and other adjustments on selected balance sheet data as previously reported for 2004 and prior years follow:
                                     
    December 31,
     
    2004   2003   2002   2001
                 
    (In thousands)
Total assets:
                               
 
As previously reported
  $ 1,322,911     $ 1,084,114     $ 942,823     $ 869,642  
 
Adjustment for effects of embezzlement:
                               
   
Property and equipment and other
    (56,133 )     (37,496 )     (20,121 )     (11,872 )
   
Income taxes receivable
          (1,044 )     (807 )     (531 )
                         
      (56,133 )     (38,540 )     (20,928 )     (12,403 )
 
Other adjustments:
                               
   
Property and equipment and other
    (9,993 )     (5,883 )     (2,350 )     (309 )
   
Income taxes receivable
          (170 )     (171 )     (75 )
                         
      (9,993 )     (6,053 )     (2,521 )     (384 )
 
As restated
  $ 1,256,785     $ 1,039,521     $ 919,374     $ 856,855  
                         
Stockholders’ equity:
                               
 
As previously reported
  $ 1,007,539     $ 819,749     $ 737,731     $ 687,142  
 
Adjustment for effects of embezzlement
    (35,285 )     (23,496 )     (12,499 )     (7,373 )
 
Other adjustments
    (10,753 )     (6,439 )     (984 )     572  
                         
 
As restated
  $ 961,501     $ 789,814     $ 724,248     $ 680,341  
                         
Working capital:
                               
 
As previously reported
  $ 236,957     $ 199,613     $ 167,863     $ 110,172  
 
Adjustment for effects of embezzlement
    (1,311 )     (1,044 )     (807 )     (531 )
 
Other adjustments
    (166 )     (170 )     (171 )     (75 )
                         
 
As restated
  $ 235,480     $ 198,399     $ 166,885     $ 109,566  
                         

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
      This Item 7 contains forward-looking statements, which are made pursuant to the “Safe Harbor” provisions of the Private Securities Litigation Reform Act of 1995.
      The financial statements and related financial information for 2004 and all prior years presented herein have been amended and restated on our Annual Report on Form 10-K/ A for the year ended December 31, 2004, filed on March 17, 2006. The determination to restate these financial statements and other information was made as a result of management’s identification of an embezzlement. Further information on the restatement can be found in Note 2 to Consolidated Financial Statements included as a part of Item 8 of this Annual Report on Form 10-K.
      Management Overview — We are a leading provider of contract services to the North American oil and natural gas industry. Our services primarily involve the drilling, on a contract basis, of land-based oil and natural gas wells and to a lesser extent, we provide pressure pumping services and drilling and completion fluid services. In addition to the aforementioned contract services, we also engage in the development, exploration, acquisition and production of oil and natural gas. For the three years ended December 31, 2005, our operating revenues consisted of the following (dollars in thousands):
                                                 
    2005   2004   2003
             
Contract drilling
  $ 1,485,684       86 %   $ 809,691       81 %   $ 639,694       82 %
Pressure pumping
    93,144       5       66,654       7       46,083       6  
Drilling and completion fluids
    122,011       7       90,557       9       69,230       9  
Oil and natural gas
    39,616       2       33,867       3       21,163       3  
                                     
    $ 1,740,455       100 %   $ 1,000,769       100 %   $ 776,170       100 %
                                     
      We provide our contract services to oil and natural gas operators in many of the oil and natural gas producing regions of North America. Our contract drilling operations are focused in various regions of Texas, New Mexico, Oklahoma, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, South Dakota and Western Canada while our pressure pumping services are focused primarily in the Appalachian Basin. Our drilling and completion fluids services are provided to operators in Texas, Southeastern New Mexico, Oklahoma, the Gulf Coast region of Louisiana and the Gulf of Mexico. Our oil and natural gas operations are primarily focused in West and South Texas, Southeastern New Mexico, Utah and Mississippi.
      We have been a leading consolidator of the land-based contract drilling industry over the past several years increasing our drilling fleet to 403 rigs as of December 31, 2005. Based on publicly available information, we believe we are the second largest owner of land-based drilling rigs in North America. Our most significant transaction occurred in May 2001 when we merged with UTI Energy Corp. in a merger of equals which basically doubled our drilling fleet and added the pressure pumping services business. Growth by acquisition has been a corporate strategy intended to expand both revenues and profits.
      The profitability of our business is most readily assessed by two primary indicators: our average number of rigs operating and our average revenue per operating day. During 2005, our average number of rigs operating increased to 276 from 211 in 2004 and our average revenue per operating day increased to $14,770 from $10,470 in 2004. Primarily due to these improvements, we experienced an increase of approximately $278 million, or 295%, in consolidated net income in 2005.
      Our revenues, profitability and cash flows are highly dependent upon the market prices of oil and natural gas. During periods of improved commodity prices, the capital spending budgets of oil and natural gas operators tend to expand, which results in increased demand for our contract services. Conversely, in periods of time when these commodity prices deteriorate, the demand for our contract services generally weakens and we experience downward pressure on pricing for our services. In addition, our operations are highly impacted by competition, the availability of excess equipment, labor issues and various other factors which are more fully described as risk factors contained in Item 1A of this Report.

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      Management believes that the liquidity of our balance sheet as of December 31, 2005, which includes approximately $382 million in working capital (including $136 million in cash), no long term debt and $144 million available under a $200 million line of credit (availability of $56 million is reserved for outstanding letters of credit) provides us with the ability to pursue acquisition opportunities, expand into new regions, make improvements to our assets and survive downturns in our industry.
      Embezzlement and Restatements — On November 3, 2005, we announced the resignation of our CFO, Jonathan D. Nelson. On November 10, 2005, we announced that, based on information received by Company senior management on November 9, 2005, the Audit Committee of our Board of Directors began an investigation into an apparent embezzlement from us by Nelson.
      On December 22, 2005, upon recommendation of Company management and the Audit Committee of our Board of Directors, we announced that based on the results to date of the internal investigation into the facts and circumstances surrounding the embezzlement by Nelson, we would restate previously issued financial statements and amend our previously issued Annual Report on Form 10-K for the year ended December 31, 2004 and Quarterly Reports on Form 10-Q for the periods ended March 31, June 30 and September 30, 2005. These restatements reflect losses incurred as a result of payments made to or for the benefit of Nelson that had been recognized in our accounting records and previously issued financial statements as payments for assets and services that we did not receive. Previously issued financial statements have also been restated for the effects of the correction of other errors that are immaterial both individually and in the aggregate. These other adjustments relate primarily to previously reported property and equipment balances that resulted from our review of our property and equipment records and the underlying physical assets in connection with investigation of the embezzlement. We have restated such financial statements, and on March 17, 2006, we filed our amended Annual Report on Form 10-K/A and on March 27, 2006, we filed our amended Quarterly Reports on Form 10-Q/A with the SEC.
      Most of the embezzled funds result from Nelson causing the wiring of Company funds aggregating approximately $72.3 million, to, or for the benefit of, entities owned and controlled by him. Nelson was originally able to initiate these wire transfers by requesting the wire transfers himself in telephone calls to one of the Company’s banks. After changes to the Company’s internal controls and procedures in 2004, Nelson initiated the wire transfers through instructions to one of his subordinates and by the creation of fraudulent invoices containing forged senior management approvals. This false documentation was created by Nelson to conceal the true nature of these transactions from the Company and its independent registered public accountants.
      Nelson also instructed certain former employees, who worked under his supervision, to alter management reports related to property and equipment expenditures. Nelson also created fictitious property and equipment approval forms with forged signatures.
      The total amount embezzled was approximately $77.5 million in cash, excluding any tax effects, beginning with the year ended December 31, 1998 through November 3, 2005 as follows (in thousands):
             
      From 1998 to December 31, 2004
  $ 58,961  
      From January 1, 2005 to September 30, 2005(1)
    12,193  
       
 
        Total through September 30, 2005
    71,154  
      From October 1, 2005 to November 3, 2005 (net of $1,500 repayment)(1)
    6,350  
       
   
           Total embezzlement
  $ 77,504  
       
 
(1)  The total amount embezzled during 2005 was $18,543,000 and the Company incurred $1,500,000 of professional fees and expenses as a result of the embezzlement. Accordingly, the total embezzled funds and related expenses in 2005 were $20,043,000.
      Commitments and Contingencies — We maintain letters of credit in the aggregate amount of approximately $56 million for the benefit of various insurance companies as collateral for retrospective premiums and retained losses which could become payable under the terms of the underlying insurance contracts. These

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letters of credit expire at various times during each calendar year. No amounts have been drawn under the letters of credit.
      We have signed non-cancelable commitments to purchase $118 million of equipment to be received throughout 2006.
      Net income for the years ended December 31, 2005, 2004 and 2003 include embezzled funds and related expenses of $20.0 million, $19.1 million and $17.8 million, respectively. On November 16, 2005, the SEC obtained a freeze order on Nelson’s assets (including assets held by entities controlled by him) and a Receiver was appointed to collect those assets. The Company understands that the Receiver will ultimately liquidate the assets and propose a plan to distribute the proceeds. While the Company believes it has a claim for at least the full amount embezzled, other creditors have or may assert claims on the assets held by the Receiver. As a result, recovery by the Company from the Receiver is uncertain as to timing and amount, if any. Recoveries, if any, will be recognized when they are considered collectable. Net income for the year ended December 31, 2002, includes a charge of $4.7 million related to the financial failure in 2002 of a workers’ compensation insurance carrier that had provided coverage for us in prior years. Net income for the year ended December 31, 2005, includes a charge of $4.2 million to increase this reserve.
      In December 2005, two purported derivative actions were filed in Texas state court in Scurry County, Texas, against our directors, alleging that the directors breached their fiduciary duties to us as a result of alleged failure to timely discover the embezzlement. The Board of Directors formed a special litigation committee to review and inquire about these allegations and recommend our response, if any. Further legal proceedings in these suits have been stayed pending completion of the work of the special litigation committee. The lawsuits seek recovery on behalf of and for us and do not seek recovery from us.
      Trading and investing — We have not engaged in trading activities that include high-risk securities, such as derivatives and non-exchange traded contracts. We invest cash primarily in highly liquid, short-term investments such as overnight deposits, money markets and highly rated municipal and commercial bonds.
      Description of business — We conduct our contract drilling operations in Texas, New Mexico, Oklahoma, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, South Dakota and Western Canada. As of December 31, 2005, we owned 403 drilling rigs. We provide pressure pumping services to oil and natural gas operators primarily in the Appalachian Basin. These services consist primarily of well stimulation and cementing for completion of new wells and remedial work on existing wells. We provide drilling fluids, completion fluids and related services to oil and natural gas operators in Texas, Southeastern New Mexico, Oklahoma, the Gulf Coast region of Louisiana and the Gulf of Mexico. Drilling and completion fluids are used by oil and natural gas operators during the drilling process to control pressure when drilling oil and natural gas wells. We are also engaged in the development, exploration, acquisition and production of oil and natural gas. Our oil and natural gas operations are focused primarily in producing regions in West and South Texas, Southeastern New Mexico, Utah and Mississippi.
      The North American land drilling industry has experienced many downturns in demand over the last decade. During these periods, there have been substantially more drilling rigs available than necessary to meet demand. As a result, drilling contractors have had difficulty sustaining profit margins during the downturn periods.
      In addition to adverse effects that future declines in demand could have on us, ongoing factors which could adversely affect utilization rates and pricing, even in an environment of stronger oil and natural gas prices and increased drilling activity, include:
  •  movement of drilling rigs from region to region,
 
  •  reactivation of land-based drilling rigs, and
 
  •  new construction of drilling rigs.
      We cannot predict either the future level of demand for our contract drilling services or future conditions in the oil and natural gas contract drilling business.

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Critical Accounting Policies
      In addition to established accounting policies, our consolidated financial statements are impacted by certain estimates and assumptions made by management. The following is a discussion of our critical accounting policies pertaining to property and equipment, oil and natural gas properties, goodwill, revenue recognition and the use of estimates.
      Property and equipment — Property and equipment, including betterments which extend the useful life of the asset, are stated at cost. Maintenance and repairs are charged to expense when incurred. We provide for the depreciation of our property and equipment using the straight-line method over the estimated useful lives. Our method of depreciation does not change when equipment becomes idle; we continue to depreciate idled equipment on a straight-line basis. No provision for salvage value is considered in determining depreciation of our property and equipment. We review our assets for impairment when events or changes in circumstances indicate that the carrying values of certain assets either exceed their respective fair values or may not be recovered over their estimated remaining useful lives. The cyclical nature of our industry has resulted in fluctuations in rig utilization over periods of time. Management believes that the contract drilling industry will continue to be cyclical and rig utilization will fluctuate. Based on management’s expectations of future trends, we estimate future cash flows in our assessment of impairment assuming the following four-year industry cycle: one year projected with low utilization, one year projected as a recovery period with improving utilization and the remaining two years projecting higher utilization. Provisions for asset impairment are charged to income when estimated future cash flows, on an undiscounted basis, are less than the asset’s net book value. Impairment charges are recorded based on discounted cash flows. There were no impairment charges to property and equipment during the years 2005, 2004 or 2003.
      Oil and natural gas properties — Oil and natural gas properties are accounted for using the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to expense when such determination is made. In accordance with Statement of Financial Accounting Standards No. 19, “Financial Accounting and Reporting by Oil and Gas Producing Companies,” (“SFAS No. 19”) costs of exploratory wells are initially capitalized to wells in progress until the outcome of the drilling is known. We review wells in progress quarterly to determine the related reserve classification. If the reserve classification is uncertain after one year following the completion of drilling, we consider the costs of the well to be impaired and recognize the costs as expense. Geological and geophysical costs, including seismic costs and costs to carry and retain undeveloped properties, are charged to expense when incurred. The capitalized costs of both developmental and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates of proved oil and natural gas reserves of each respective field. We review our proved oil and natural gas properties for impairment when an event occurs such as downward revisions in reserve estimates or decreases in oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are provided by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between its net book value and discounted cash flow. Unproved oil and natural gas properties are reviewed quarterly to determine impairment. Our intent to drill, lease expiration and abandonment of area are considered. Assessment of impairment is made on a lease-by-lease basis. If an unproved property is determined to be impaired, then costs related to that property are expensed. Impairment expense of approximately $4.4 million, $3.2 million and $1.4 million for the years ended December 31, 2005, 2004 and 2003, respectively, is included in depreciation, depletion and impairment in the accompanying financial statements.
      Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. As such, we assess impairment of our goodwill annually or on an interim basis if events or circumstances indicate that the fair value of the asset has decreased below its carrying value.

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      Revenue recognition — Revenues are recognized when services are performed, except for revenues earned under turnkey contract drilling arrangements which are recognized using the completed contract method of accounting, as described below. We follow the percentage-of-completion method of accounting for footage contract drilling arrangements. Under the percentage-of-completion method, management estimates are relied upon in the determination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling arrangements and risks therein, we follow the completed contract method of accounting for such arrangements. Under this method, revenues and expenses related to a well in progress are deferred and recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses are expected to exceed estimated total revenues.
      In accordance with Emerging Issues Task Force Issue No. 00-14, we recognize reimbursements received from third parties for out-of-pocket expenses incurred as revenues and account for out-of-pocket expenses as direct costs.
      Use of estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates.
      Key estimates used by management include:
  •  allowance for doubtful accounts,
 
  •  total expenses to be incurred on footage and turnkey drilling contracts,
 
  •  depreciation and depletion,
 
  •  asset impairment,
 
  •  reserves for self-insured levels of insurance coverages, and
 
  •  fair values of assets and liabilities assumed in acquisitions.
      For additional information on our accounting policies, see Note 1 of Notes to Consolidated Financial Statements included as a part of Item 8 of this Report.
Related Party Transactions
      We operate certain oil and natural gas properties in which certain of our affiliated persons have participated, either individually or through entities they control, in the prospects or properties in which we have an interest. These participations, which have been on a working interest basis, have been in prospects or properties we originated or acquired. At December 31, 2005, affiliated persons were working interest owners in 254 of 305 total wells we operated. We make sales of working interests to reduce our economic risk in the properties. Generally, it is more efficient for us to sell the working interests to these affiliated persons than to market them to unrelated third parties. Sales of working interests were made at cost, including our costs of acquiring and preparing the working interests for sale. These costs were paid by the working interest owners on a pro rata basis based upon their working interest ownership percentage. The price at which working interests were sold to affiliated persons was the same price at which working interests were sold to unaffiliated persons.
      Production revenues and joint interest costs of each of the affiliated persons during 2005 for all wells operated by us in which the affiliated persons have working interests are presented in the table below. These amounts do not necessarily represent their profits or losses from these interests because the joint interest costs do not include the parties’ related drilling and leasehold acquisition costs incurred prior to January 1, 2005. These activities resulted in a payable to the affiliated persons of approximately $1.5 million and $1.2 million

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and a receivable from the affiliated persons of approximately $1.2 million and $856,000 at December 31, 2005 and 2004, respectively.
                     
    Year Ended
    December 31, 2005
     
        Joint
    Production   Interest
Name   Revenues(1)   Costs(2)
         
Cloyce A. Talbott
  $ 195,491     $ 49,668  
Anita Talbott(3)
    88,824       21,389  
Jana Talbott, Executrix to the Estate of Steve Talbott(3)
    19,373       2,871  
Stan Talbott(3)
    7,639       3,163  
John Evan Talbott Trust(3)
    3,725       987  
Lisa Beck and Stacy Talbott(3)
    1,158,657       492,839  
SSI Oil & Gas, Inc.(4)
    210,825       97,152  
IDC Enterprises, Ltd.(5)
    13,432,098       8,460,393  
             
 
Subtotal
    15,116,632       9,128,462  
             
A. Glenn Patterson
    122,348       29,075  
Robert Patterson(6)
    7,719       4,396  
Thomas M. Patterson(6)
    7,719       4,396  
             
 
Subtotal
    137,786       37,867  
             
Jonathan D. Nelson, former Chief Financial Officer
    290,506       381,506  
             
   
Total
  $ 15,544,924     $ 9,547,835  
             
 
(1)  Revenues for production of oil and natural gas, net of state severance taxes.
 
(2)  Includes leasehold costs, tangible equipment costs, intangible drilling costs and lease operating expense billed during that period. All joint interest costs have been paid on a timely basis.
 
(3)  Anita Talbott is the wife of Cloyce A. Talbott. Stan Talbott, Lisa Beck and Stacy Talbott are Mr. Talbott’s adult children. Steve Talbott is the deceased son of Mr. Talbott. John Evan Talbott is Mr. Talbott’s grandson.
 
(4)  SSI Oil & Gas, Inc. is beneficially owned 50% by Cloyce A. Talbott and directly owned 50% by A. Glenn Patterson.
 
(5)  IDC Enterprises, Ltd. is 50% owned by Cloyce A. Talbott and 50% owned by A. Glenn Patterson.
 
(6)  Robert and Thomas M. Patterson are A. Glenn Patterson’s adult children.
      In 2005, 2004 and 2003, we paid approximately $424,000, $914,000 and $740,000, respectively, to TMP Truck and Trailer LP (“TMP”), during the period it was owned by Thomas M. Patterson (son of A. Glenn Patterson), for certain equipment and metal fabrication services. Purchases from TMP were at current market prices.
      In 2005 and 2004, we paid approximately $273,000 and $39,000, respectively, to Melco Services (“Melco”) for dirt contracting services and $59,000 and $44,000, respectively, to L&N Transportation (“L&N”) for water hauling services. Both entities are owned by Lance D. Nelson, brother of Jonathan D. Nelson. Purchases from Melco and L&N were at current market prices.
      See Note 2 of Notes to Consolidated Financial Statements included as a part of Item 8 of this Report for information pertaining to fraudulent payments made to or for the benefit of Jonathan D. Nelson, our former CFO.

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Liquidity and Capital Resources
      As of December 31, 2005, we had working capital of $382 million including cash and cash equivalents of $136 million. For 2005, our sources of cash flow included:
  •  $460 million from operations,
 
  •  $43 million from the exercise of stock options, and
 
  •  $13 million from sales of property and equipment.
      We used $74 million to purchase land drilling assets from Key Energy Services, Inc. and six additional land-based drilling rigs, $27 million to pay dividends on our common stock, $12 million to buy 355,000 shares of our common stock pursuant to the stock buyback program authorized by our Board of Directors on June 7, 2004 and $380 million:
  •  to make capital expenditures for the betterment and refurbishment of our drilling rigs,
 
  •  to acquire and procure drilling equipment,
 
  •  to fund capital expenditures for our pressure pumping and drilling and completion fluids divisions, and
 
  •  to fund leasehold acquisition and exploration and development of oil and natural gas properties.
      As of December 31, 2005, $400,000 of cash was pledged as collateral for losses which could become payable under the terms of our workers’ compensation insurance contracts and was therefore restricted as to use.
      In January 2005, we purchased land drilling assets of Key Energy Services, Inc. for $61.8 million. The assets acquired included 25 active and 10 stacked land-based drilling rigs, related drilling equipment, yard facilities and a rig moving fleet consisting of approximately 45 trucks and 100 trailers. In June 2005, we acquired one land-based drilling rig for $3.6 million. In September 2005, we acquired five land-based drilling rigs and related drilling equipment for $8.2 million. The transactions were accounted for as acquisitions of asset and the respective purchase prices were allocated among the assets acquired based on their estimated fair market values.
      We replaced our prior credit facility in December 2004 with a five-year, $200 million unsecured revolving line of credit (“LOC”). Interest is to be paid on outstanding LOC balances at a floating rate ranging from LIBOR plus 0.625% to 1.0% or the prime rate. This arrangement includes various fees, including a commitment fee on the average daily unused amount (0.15% at December 31, 2005). There are customary restrictions and covenants associated with the LOC. Financial covenants provide for a maximum debt to capitalization ratio and a minimum interest coverage ratio. We do not expect that the restrictions and covenants will restrict our ability to operate or react to opportunities that might arise. Availability under the LOC is reduced by outstanding letters of credit which totaled $56 million at December 31, 2005. There were no outstanding borrowings under the LOC at December 31, 2005.
      In February 2005, our Board of Directors approved an increase in the quarterly cash dividend on our common stock to $0.04 per share from $0.02 per share. The next quarterly cash dividend is to be paid to holders of record on March 15, 2006 and paid on March 30, 2006.
      On June 7, 2004, our Board of Directors authorized a stock buyback program for the purchase of up to $30 million of our outstanding common stock. During the second quarter of 2004, we purchased 100,000 shares of our common stock in the open market for approximately $1.5 million (adjusted to reflect the two-for-one stock split on June 30, 2004). During the fourth quarter of 2005, we purchased 355,000 shares of our common stock in the open market for approximately $12.2 million. These shares are included in treasury stock. On March 27, 2006, our Board of Directors increased the stock buyback program to allow the future purchases of up to $200 million of our outstanding common stock.
      We believe that the current level of cash and short-term investments, together with cash generated from operations, should be sufficient to meet our capital needs. From time to time, acquisition opportunities are

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evaluated. The timing, size or success of any acquisition and the associated capital commitments are unpredictable. Should opportunities for growth requiring capital arise, we believe we would be able to satisfy these needs through a combination of working capital, cash generated from operations, our existing credit facility and additional debt financing or equity financing. However, there can be no assurance that such capital would be available.
Results of Operations
Comparison of the years ended December 31, 2005 and 2004
      A summary of operations by business segment for the years ended December 31, 2005 and 2004 follows:
                         
    Years Ended December 31,
     
        Restated    
        (See Note 2)    
Contract Drilling   2005   2004   % Change
             
    (Dollars in thousands)
Revenues
  $ 1,485,684     $ 809,691       83.5 %
Direct operating costs
  $ 776,313     $ 556,869       39.4 %
Selling, general and administrative
  $ 5,069     $ 4,417       14.8 %
Depreciation
  $ 131,740     $ 101,779       29.4 %
Operating income
  $ 572,562     $ 146,626       290.5 %
Operating days
    100,591       77,355       30.0 %
Average revenue per operating day
  $ 14.77     $ 10.47       41.1 %
Average direct operating costs per operating day
  $ 7.72     $ 7.20       7.2 %
Number of owned rigs at end of period
    403       361       11.6 %
Average number of rigs owned during period
    397       359       10.6 %
Average rigs operating
    276       211       30.8 %
Rig utilization percentage
    69 %     59 %     16.9 %
Capital expenditures
  $ 329,073     $ 140,945       133.5 %
      The market price of natural gas remained high in 2005. In fact, the average market price of natural gas improved to $8.98 per Mcf in 2005 compared to $5.95 per Mcf in 2004, resulting in an increase in demand for our contract drilling services. Our average number of rigs operating increased to 276 in 2005 from 211 in 2004. The average market price of natural gas and our average rigs operating for each of the fiscal quarters in 2005 and 2004 follow:
                                 
    1st   2nd   3rd   4th
    Quarter   Quarter   Quarter   Quarter
                 
2005:
                               
Average natural gas price
  $ 6.62     $ 7.14     $ 9.82     $ 12.64  
Average rigs operating
    263       265       283       292  
2004:
                               
Average natural gas price
  $ 5.64     $ 6.13     $ 5.62     $ 6.42  
Average rigs operating
    197       203       216       229  
      Revenues and direct operating costs increased as a result of the increased number of operating days, as well as an increase in the average revenue and average direct operating costs per operating day. Operating days and average rigs operating increased as a result of the increased demand for our contract drilling services, the acquisition of land drilling assets from Key Energy Services, Inc. in January 2005 and activation of refurbished stacked rigs. Average revenue per operating day increased as a result of increased demand and pricing for our drilling services. Significant capital expenditures were incurred during 2005 to activate additional drilling rigs to meet increased demand, to modify and upgrade our existing drilling rigs and to acquire additional related equipment such as drill pipe, drill collars, engines, fluid circulating systems, rig hoisting systems and safety

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enhancement equipment. Increased depreciation expense in 2005 was due to acquisitions and capital expenditures in 2004 and 2005.
                         
    Years Ended December 31,
     
Pressure Pumping   2005   2004   % Change
             
    (Dollars in thousands)
Revenues
  $ 93,144     $ 66,654       39.7 %
Direct operating costs
  $ 54,956     $ 37,561       46.3 %
Selling, general and administrative
  $ 9,430     $ 7,234       30.4 %
Depreciation
  $ 7,094     $ 5,112       38.8 %
Operating income
  $ 21,664     $ 16,747       29.4 %
Total jobs
    9,615       7,444       29.2 %
Average revenue per job
  $ 9.69     $ 8.95       8.3 %
Average direct operating costs per job
  $ 5.72     $ 5.05       13.3 %
Capital expenditures
  $ 25,508     $ 17,705       44.1 %
      Revenues and direct operating costs for our pressure pumping operations increased as a result of the increased number of jobs, as well as an increase in the average revenue and average direct operating costs per job. The increase in jobs in 2005 was largely due to our expanded operations in the Appalachian regions of Kentucky, Tennessee and West Virginia, as well as increased demand for our services resulting from the improved industry conditions as discussed in “Contract Drilling” above. Increased average revenue per job was due primarily to increased pricing for our services. Selling, general and administrative expenses increased largely as a result of the expanding operations of the pressure pumping segment. Increased depreciation expense during 2005 was largely due to the expansion of the pressure pumping segment from 2003 through 2005 and related expenditures to acquire necessary equipment to facilitate the growth. Capital expenditures increased in 2005 compared to 2004 due to further expansion of services into Tennessee and Wyoming as well as modifications and upgrades to existing equipment and facilities.
                         
    Years Ended December 31,
     
        Restated    
        (See Note 2)    
Drilling and Completion Fluids   2005   2004   % Change
             
    (Dollars in thousands)
Revenues
  $ 122,011     $ 90,557       34.7 %
Direct operating costs
  $ 98,530     $ 76,503       28.8 %
Selling, general and administrative
  $ 8,912     $ 7,696       15.8 %
Depreciation
  $ 2,368     $ 2,156       9.8 %
Other operating
  $ 254     $       N/A %
Operating income
  $ 11,947     $ 4,202       184.3 %
Total jobs
    1,980       2,205       (10.2 )%
Average revenue per job
  $ 61.62     $ 41.07       50.0 %
Average direct operating costs per job
  $ 49.76     $ 34.70       43.4 %
Capital expenditures
  $ 3,042     $ 1,488       104.4 %
      Revenues and direct operating costs increased as a result of an increase in the average revenue and direct operating costs per job. Average revenue and direct operating costs per job increased primarily as a result of an increase in the size of our offshore jobs. Selling, general and administrative expense increased primarily due to increased incentive compensation resulting from higher profitability levels. Other expense from operations

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includes a charge of $254,000 representing the deductible portion of the Company’s insurance coverage for damage caused by the hurricanes in August and September 2005.
                         
    Years Ended December 31,
     
Oil and Natural Gas Production and Exploration   2005   2004   % Change
             
    (Dollars in thousands)
Revenues
  $ 39,616     $ 33,867       17.0 %
Direct operating costs
  $ 9,566     $ 7,978       19.9 %
Selling, general and administrative
  $ 2,189     $ 1,816       20.5 %
Depreciation, depletion and impairment
  $ 14,456     $ 13,309       8.6 %
Operating income
  $ 13,405     $ 10,764       24.5 %
Capital expenditures
  $ 17,163     $ 14,451       18.8 %
Average net daily oil production (Bbls)
    860       1,071       (19.7 )%
Average net daily gas production (Mcf)
    7,016       7,429       (5.6 )%
Average oil sales price (per Bbl)
  $ 54.30     $ 39.12       38.8 %
Average gas sales price (per Mcf)
  $ 7.64     $ 5.81       31.5 %
      Revenues increased due to increased market prices for oil and natural gas. Direct operating costs increased as a result of higher oilfield service cost and production taxes. Average net daily oil production decreased as a result of production declines and the sale of certain oil properties during 2005. Average net daily gas production also decreased as a result of the sale of certain natural gas properties, however, this decrease was partially offset by an increase in production. Depreciation, depletion and impairment expense includes approximately $4.4 million and $3.2 million of expenses incurred during 2005 and 2004, respectively, to impair certain oil and natural gas properties.
                         
    Years Ended December 31,
     
        Restated    
        (See Note 2)    
Corporate and Other   2005   2004   % Change
             
    (Dollars in thousands)
Selling, general and administrative
  $ 13,510     $ 10,820       24.9 %
Bad debt expense
  $ 1,231     $ 897       37.2 %
Depreciation
  $ 735     $ 444       65.5 %
Other operating (including gain or loss on sale of assets)
  $ 2,763     $ (1,411 )     N/A %
Embezzled funds and related expenses
  $ 20,043     $ 19,122       4.8 %
Interest income
  $ 3,551     $ 1,140       211.5 %
Interest expense
  $ 516     $ 695       (25.8 )%
Other income
  $ 428     $ 235       82.1 %
Capital expenditures
  $ 5,308     $       N/A %
      Selling, general and administrative expenses increased primarily as a result of payroll taxes attributable to the exercise of employee stock options, increased professional fees and additional compensation expense related to the issuance of restricted shares to certain key employees in 2004 and 2005. Embezzled funds and related expenses includes fraudulent payments made to or for the benefit of Jonathan D. Nelson, our former CFO, for assets and services that were not received by the Company and professional fees and expenses incurred as a result of the embezzlement. Other expense from operations in 2005 includes a charge of $4.2 million to increase reserves related to the financial failure of a workers’ compensation insurance carrier used previously by the Company.

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Comparison of the years ended December 31, 2004 and 2003
      A summary of operations by business segment for the years ended December 31, 2004 and 2003 follows:
                         
    Restated (See Note 2)
     
    Years Ended December 31,
     
Contract Drilling   2004   2003   % Change
             
    (Dollars in thousands)
Revenues
  $ 809,691     $ 639,694       26.6 %
Direct operating costs
  $ 556,869     $ 475,224       17.2 %
Selling, general and administrative
  $ 4,417     $ 4,401       0.4 %
Depreciation
  $ 101,779     $ 87,255       16.6 %
Operating income
  $ 146,626     $ 72,814       101.4 %
Operating days
    77,355       68,798       12.4 %
Average revenue per operating day
  $ 10.47     $ 9.30       12.6 %
Average direct operating costs per operating day
  $ 7.20     $ 6.91       4.2 %
Number of owned rigs at end of period
    361       343       5.2 %
Average number of rigs owned during period
    359       336       6.8 %
Average rigs operating
    211       188       12.2 %
Rig utilization percentage
    59 %     56 %     5.4 %
Capital expenditures
  $ 140,945     $ 77,350       82.2 %
      The market price of natural gas remained high in 2004. In fact, the average market price of natural gas improved to $5.95 per Mcf in 2004 compared to $5.45 per Mcf in 2003, resulting in an increase in demand for our contract drilling services. Our average number of rigs operating increased to 211 in 2004 from 188 in 2003. The average market price of natural gas and our average rigs operating for each of the fiscal quarters in 2004 and 2003 follow:
                                 
    1st   2nd   3rd   4th
    Quarter   Quarter   Quarter   Quarter
                 
2004:
                               
Average natural gas price
  $ 5.64     $ 6.13     $ 5.62     $ 6.42  
Average rigs operating
    197       203       216       229  
2003:
                               
Average natural gas price
  $ 5.91     $ 5.70     $ 4.88     $ 5.29  
Average rigs operating
    176       195       192       191  
      Revenues and direct operating costs increased as a result of the increased number of operating days, as well as an increase in the average revenue and direct operating costs per operating day in 2004. Average revenue per operating day increased as a result of increased demand and pricing for our contract drilling services. Significant capital expenditures were incurred during 2004 to activate additional drilling rigs to meet increased demand, to modify and upgrade our existing drilling rigs and to acquire additional related equipment such as drill pipe, drill collars, engines, fluid circulating systems, rig hoisting systems and safety enhancement

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equipment. Increased depreciation expense in 2004 was due primarily to capital expenditures in 2003 and 2004, as well as acquisitions.
                         
    Years Ended December 31,
     
Pressure Pumping   2004   2003   % Change
             
    (Dollars in thousands)
Revenues
  $ 66,654     $ 46,083       44.6 %
Direct operating costs
  $ 37,561     $ 26,184       43.5 %
Selling, general and administrative
  $ 7,234     $ 5,683       27.3 %
Depreciation
  $ 5,112     $ 3,774       35.5 %
Operating income
  $ 16,747     $ 10,442       60.4 %
Total jobs
    7,444       5,667       31.4 %
Average revenue per job
  $ 8.95     $ 8.13       10.1 %
Average direct operating costs per job
  $ 5.05     $ 4.62       9.3 %
Capital expenditures
  $ 17,705     $ 10,524       68.2 %
      Revenues and direct operating costs for our pressure pumping operations increased as a result of the increased number of jobs, as well as an increase in the average revenue and average direct operating costs per job. The increase in jobs in 2004 was largely due to our expanded operations in the Appalachian regions of Kentucky, Tennessee and West Virginia, as well as increased demand for our services resulting from the improved industry conditions as discussed in “Contract Drilling” above. Increased average revenue per job was due primarily to increased pricing for our services. Selling, general and administrative expenses increased largely as a result of the expanding operations of the pressure pumping segment. Increased depreciation expense during 2004 was largely due to the expansion of the pressure pumping segment during 2004 and 2003 and related expenditures to acquire necessary equipment to facilitate the growth. Capital expenditures increased in 2004 compared to 2003 due to further expansion of services into Tennessee and Wyoming as well as modifications and upgrades to existing equipment and facilities.
                         
    Years Ended December 31,
     
    Restated (See Note 2)
     
Drilling and Completion Fluids   2004   2003   % Change
             
    (Dollars in thousands)
Revenues
  $ 90,557     $ 69,230       30.8 %
Direct operating costs
  $ 76,503     $ 61,424       24.5 %
Selling, general and administrative
  $ 7,696     $ 7,447       3.3 %
Depreciation
  $ 2,156     $ 2,279       (5.4 )%
Operating income (loss)
  $ 4,202     $ (1,920 )     N/A %
Total jobs
    2,205       1,931       14.2 %
Average revenue per job
  $ 41.07     $ 35.85       14.6 %
Average direct operating costs per job
  $ 34.70     $ 31.81       9.1 %
Capital expenditures
  $ 1,488     $ 912       63.2 %
      The number of jobs increased as a result of the improved industry conditions as discussed in “Contract Drilling” above, as well as increased drilling activity in the Gulf of Mexico. Revenues and direct operating costs increased in 2004 primarily as a result of the increased number of jobs, as well as an increase in the

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average revenue and direct operating costs per job. Average revenue and direct operating costs per job increased primarily as a result of an increase in the number of larger jobs completed in the Gulf of Mexico.
                         
    Years Ended December 31,
     
Oil and Natural Gas Production and Exploration   2004   2003   % Change
             
    (Dollars in thousands)
Revenues
  $ 33,867     $ 21,163       60.0 %
Direct operating costs
  $ 7,978     $ 4,808       65.9 %
Selling, general and administrative
  $ 1,816     $ 1,489       22.0 %
Depreciation, depletion and impairment
  $ 13,309     $ 7,082       87.9 %
Operating income
  $ 10,764     $ 7,784       38.3 %
Capital expenditures
  $ 14,451     $ 10,015       44.3 %
Average net daily oil production (Bbls)
    1,071       788       35.9 %
Average net daily gas production (Mcf)
    7,429       5,656       31.3 %
Average oil sales price (per Bbl)
  $ 39.12     $ 30.54       28.1 %
Average gas sales price (per Mcf)
  $ 5.81     $ 4.97       16.9 %
      Oil and gas revenues and direct operating costs increased in 2004 compared to 2003, primarily due to the oil and natural gas properties acquired in the acquisition of TMBR during February 2004 and increased market prices received for oil and natural gas during 2004. Direct operating costs further increased as a result of approximately $600,000 of dry hole costs incurred during 2004. Depreciation, depletion and impairment expense increased in 2004 primarily as a result of increased production and an increase of approximately $1.8 million of expenses incurred to impair certain oil and natural gas properties.
                         
    Years Ended December 31,
     
    Restated (See Note 2)
     
Corporate and Other   2004   2003   % Change
             
    (Dollars in thousands)
Selling, general and administrative
  $ 10,820     $ 8,665       24.9 %
Bad debt expense
  $ 897     $ 259       246.3 %
Depreciation
  $ 444     $ 444       %
Other operating (including gain or loss on sale of assets)
  $ (1,411 )   $ (4,379 )     67.8 %
Embezzled funds expense
  $ 19,122     $ 17,849       7.1 %
Interest income
  $ 1,140     $ 1,116       2.2 %
Interest expense
  $ 695     $ 292       138.0 %
Other income
  $ 235     $ 1,870       (87.4 )%
      Selling, general and administrative expenses increased primarily as a result of increased professional expenses (including expenses incurred during 2004 to comply with the requirements of Section 404 of the Sarbanes-Oxley Act of 2002) and additional compensation expense related to the issuance of restricted shares to certain key employees. Embezzled funds expense includes fraudulent payments made to or for the benefit of Jonathan D. Nelson, our former CFO, for assets and services that were not received by the Company. Interest expense in 2004 included approximately $445,000 of termination fees and other related charges incurred as a result of the replacement of our credit facility. Restructuring and other charges in 2003 includes a $2.5 million payment received as settlement for contract drilling services previously provided in Mexico by our wholly-owned subsidiary, Norton Drilling Company Mexico, Inc. The receivable had been reserved as uncollectible at the time of our acquisition of Norton Drilling Company Mexico, Inc. in 1999. Other income in 2003 includes approximately $1.7 million representing our pro rata share of the net income of TMBR using the equity method of accounting.

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Income Taxes
                         
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003
             
    (Dollars in thousands)
Income before income tax
  $ 584,759     $ 149,147     $ 68,976  
Income tax expense
    212,019       54,801       25,320  
Effective tax rate
    36.3 %     36.7 %     36.7 %
      The significance of the impact of the permanent differences to our effective income tax rate in 2005 was largely attributable to the new Domestic Production Activities Deduction. The deduction was enacted as part of the American Jobs Creation Act of 2004 effective for taxable years after December 31, 2004. The act allows a deduction of 3% in 2005 or 2006, 6% in 2007, 2008 or 2009, and 9% 2010 and after on the lesser of qualified production activities income or taxable income. Our effective income tax rate of 36.7% for 2004 and 2003 is primarily attributable to a Federal rate of 35.0% and state income tax rates of 1.6% and 1.5%, respectively. The impact of permanent differences was not significant in 2004 or 2003.
      For tax purposes, we have available at December 31, 2005, Federal net operating loss carryforwards of approximately $11 million and $118,000 of alternative minimum tax credit carryforwards. These carryforwards are attributable to the acquisition of TMBR in February 2004.
      The net operating loss carryforwards, if unused, are scheduled to expire as follows: 2006 — $1 million, 2011 — $2 million, 2018 — $4 million and 2019 — $4 million. The alternative minimum tax credit may be carried forward indefinitely.
      We record deferred Federal income taxes based primarily on the relationship between the amount of our unused Federal net operating loss carryforwards and the temporary differences between the book basis and tax basis in our assets. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which those temporary differences are expected to be settled. As a result of fully recognizing the benefit of our deferred income taxes, we incur deferred income tax expense as these benefits are utilized. We incurred deferred income tax expense of approximately $17.1 million, $14.8 million and $10.0 million for 2005, 2004 and 2003, respectively.
Volatility of Oil and Natural Gas Prices
      Our revenue, profitability and rate of growth are substantially dependent upon prevailing prices for oil and natural gas, with respect to all of our operating segments. For many years, oil and natural gas prices and markets have been volatile. Prices are affected by market supply and demand factors as well as international military, political and economic conditions, and the ability of OPEC, to set and maintain production and price targets. All of these factors are beyond our control. Natural gas prices fell from an average of $6.23 per Mcf in the first quarter of 2001 to an average of $2.51 per Mcf for the same period in 2002. During this same period, the average number of our rigs operating dropped by approximately 50%. The average market price of natural gas improved from $3.36 in 2002 to and $8.98 in 2005, resulting in an increase in demand for our drilling services. Our average number of rigs operating increased from 126 in 2002 to 276 in 2005. We expect oil and natural gas prices to continue to be volatile and to affect our financial condition and operations and ability to access sources of capital. A significant decrease in expected market prices for natural gas could result in a material decrease in demand for drilling rigs and reduction in our operation results.
      The North American land drilling industry has experienced many downturns in demand over the last decade. During these periods, there have been substantially more drilling rigs available than necessary to meet demand. As a result, drilling contractors have had difficulty sustaining profit margins during the downturn periods.

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Impact of Inflation
      We believe that inflation will not have a significant near-term impact on our financial position.
Recently-Issued Accounting Standards
      The Financial Accounting standards Board (“FASB”) issued Staff Position FIN 47, Accounting for Conditional Asset Retirement Obligations (“FIN 47”), an interpretation of FASB Statement No. 143, in March 2005. The statement clarifies the term “conditional asset retirement obligation” as used in FASB 143. The provisions of FIN 47, which the Company adopted on December 31, 2005, did not have a material impact on the Company’s financial position or results of operations.
      The FASB issued Statement of Financial Accounting Standard No. 123 (revised 2004), Share-Based Payment (“SFAS 123(R)”) in December 2004; it replaces FASB Statement of Financial Accounting Standards No. 123, Accounting for Stock-Based Compensation, and supersedes Accounting Principles Board Opinion No. 25, Accounting for Stock Issued to Employees. Under SFAS 123(R), companies would have been required to implement the standard as of the beginning of the first interim reporting period that begins after June 15, 2005. However, in April 2005, the SEC announced the adoption of an Amendment to Rule 4-01(a) of Regulation S-X regarding the compliance date for SFAS 123(R) that amends the compliance dates and allows companies to implement SFAS 123(R) beginning with the first annual reporting period beginning on or after June 15, 2005. The Company intends to adopt SFAS 123(R) on January 1, 2006.
      We currently use the intrinsic value method to value stock options, and accordingly, no compensation expense has been recognized for stock options since we grant stock options with exercise prices equal to our common stock market price on the date of the grant. SFAS 123(R) requires the expensing of all stock-based compensation, including stock options and restricted shares, using the fair value method. We intend to expense stock options using the Modified Prospective Transition method as described in SFAS 123(R). This method will require expense to be recognized for stock options over their respective remaining vesting periods. No expense will be recognized for stock options vested in periods prior to the adoption of SFAS 123(R). We are evaluating the impact of the adoption of SFAS 123(R) on our results of operations and financial position. Adoption is not expected to have a material effect on our financial position or results of operations.
      The FASB issued Statement of Financial Accounting Standard No. 151, Inventory Costs — an amend of ARB No. 43, Chapter 4 (“SFAS 151”). SFAS 151 is effective, and will be adopted, for inventory costs incurred during fiscal years beginning after June 15, 2005 and is to be applied prospectively. SFAS 151 amends the guidance in ARB No. 43, Chapter 4, Inventory Pricing, to require current period recognition of abnormal amounts of idle facility expense, freight, handling costs and wasted material (spoilage). Adoption is not expected to have a material effect on our financial position or results of operations.
      The FASB issued Statement of Financial Accounting Standard No. 153, Exchanges of Nonmonetary Assets — an amendment of APB Opinion No. 29 (“SFAS 153”). FAS 153 is effective, and will be adopted, for nonmonetary asset exchanges occurring in fiscal periods beginning after June 15, 2005 and is to be applied prospectively. SFAS 153 eliminates the exception for fair value treatment of nonmonetary exchanges of similar productive assets and replaces it with a general exception for exchanges of nonmonetary assets that do not have commercial substance. A nonmonetary exchange has commercial substance if the future cash flows of the entity are expected to change significantly as a result of the exchange. Adoption is not expected to have a material effect on our financial position or results of operations.
      The FASB issued Statement of Financial Accounting standards No. 154, Accounting changes and Error Corrections — a replacement of APB Opinion No. 20 and FASB Statement No. 3 (“SFAS 145”). SFAS 154 is effective, and will be adopted for accounting changes made in fiscal years beginning after December 15, 2005 and is to be applied retrospectively. SFAS 154 requires that retroactive application of a change in accounting principle be limited to the direct effects of the change. Adoption is not expected to have a material effect on the Company’s financial position or results of operations.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk
      We currently have no exposure to interest rate market risk as we have no outstanding balance under our credit facility. Should we incur a balance in the future, we would have exposure associated with the floating rate of the interest charged on that balance. The revolving credit facility calls for periodic interest payments at a floating rate ranging from LIBOR plus 0.625% to 1.0% or at the prime rate. The applicable rate above LIBOR is based upon our debt to capitalization ratio. Our exposure to interest rate risk due to changes in LIBOR is not expected to be material.
      We conduct some business in Canadian dollars through our Canadian land-based drilling operations. The exchange rate between Canadian dollars and U.S. dollars has fluctuated during the last several years. If the value of the Canadian dollar against the U.S. dollar weakens, revenues and earnings of our Canadian operations will be reduced and the value of our Canadian net assets will decline when they are translated to U.S. dollars.
Item 8. Financial Statements and Supplementary Data.
      Financial Statements are filed as a part of this Report at the end of Part IV hereof beginning at page F-1, Index to Consolidated Financial Statements, and are incorporated herein by this reference.
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.
      None.
Item 9A. Controls and Procedures.
Background to the Fraud and Restatement
      In November 2005, the Company discovered that its former Chief Financial Officer, Jonathan D. Nelson (“Nelson”), had fraudulently diverted approximately $78 million in Company funds for his own benefit. Nelson’s fraudulent diversions began in 1998 and continued until the fourth quarter of 2005 when he resigned from the Company. The funds fraudulently diverted were recorded as payments for assets or services that were not actually received by the Company.
      Beginning in 1998, and continuing until late 2000, Nelson wrote a series of checks aggregating approximately $4.9 million to himself and to, or for the benefit of, a company owned and controlled by him. During this time, Nelson had check writing authority on the Company’s principal funding account, and also had the ability to intercept bank statement information sent to the Company. When Nelson intercepted that information, he removed the cancelled checks reflecting the embezzled funds from the bank statements and then provided false information to other Company employees regarding those checks. Company employees used the false information Nelson provided in recording the transactions.
      In 1999, Nelson gained access to a form authorizing his salary increase and improperly added a provision to it that created an additional expense allowance benefit of $2,000 per month, along with a provision making the salary increase and unauthorized expense allowance retroactive for several months. Nelson added these provisions himself and then forged the initials of the Company’s Chief Executive Officer on the form as authorization for these non-approved payments.
      Beginning in December 2000 and continuing until October 2005, Nelson caused the wiring of Company funds aggregating approximately $70.2 million to, or for the benefit of, entities owned and controlled by him. Nelson was originally able to initiate these wire transfers by requesting the wire transfers himself in telephone calls to one of the Company’s banks. After changes to the Company’s internal controls and procedures in 2004, Nelson initiated the wire transfers through instructions to one of his subordinates and by the creation of fraudulent invoices containing forged senior management approvals.
      In connection with an acquisition by the Company in early 2004, Nelson also used a wire transfer to fraudulently divert funds from the Company. At the time of the acquisition, Nelson initiated a wire transfer for approximately $2.1 million by sending an email to one of his subordinates in which he falsely represented that

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the wired funds were to be used to pay off the seller’s obligation for an aircraft maintenance agreement relating to the acquired business. In reality, Nelson used the funds to purchase an airplane for his personal use.
      Finally, in October 2004, Nelson diverted Company funds of approximately $1.6 million to finance an investment in a company. Nelson accomplished the fraudulent diversion of Company funds by improperly directing the bank to fund Nelson’s personal investment.
      After Nelson resigned from the Company in November 2005, the Company became aware that Nelson had fraudulently diverted Company funds. As a result, the Audit Committee of the Board of Directors commenced an investigation into Nelson’s activities. The Audit Committee retained independent counsel and independent forensic accountants to assist with the investigation.
      The investigation confirmed the above facts and revealed that Nelson exploited the reliance placed on him to create an environment at the Company which discouraged routine communication concerning financial and business information within the organization between senior management (other than Nelson) and those employees engaged in the Company’s financial reporting and accounting functions (other than Nelson). Nelson also discouraged communication between employees involved in financial reporting and accounting functions and those involved in operational activities. The control environment at the Company resulted in Company employees placing trust in Nelson and placed Nelson at the center of information flows about financial reporting and accounting matters.
      The control environment allowed Nelson to override certain of the Company’s internal controls and procedures, and contributed to the failure of Company employees charged with certain financial and accounting duties to exercise appropriate judgment, skepticism and objectivity, such that prevention or detection of the override of established policies, procedures, controls and Nelson’s inappropriate transactions did not occur while Nelson was employed by the Company. This allowed Nelson to make unauthorized payments for assets that were not, in fact, ordered by or delivered to the Company, and for services that were not actually provided to the Company and to conceal the fraudulent transactions within the Company’s accounting and financial records and reports.
      On December 22, 2005, the Company announced that the Audit Committee of the Board of Directors had concluded that it was necessary to restate its previously reported consolidated financial statements for the years ended December 31, 2004, 2003 and 2002. The Company also restated its previously reported consolidated financial statements for the first three quarters of 2005 and all quarters in 2004 and 2003. The Company filed an Annual Report on Form 10-K/A on March 17, 2006, and Quarterly Reports on Form 10-Q/A on March 27, 2006 that included these restated consolidated financial statements. Restatement adjustments are further described in Note 2 of the Notes to the Consolidated Financial Statements.
Disclosure Controls and Procedures
      Under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and current Chief Financial Officer (CFO), we conducted an evaluation of the effectiveness of our disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) promulgated under the Securities and Exchange Act of 1934, as amended (the Exchange Act), as of the end of the period covered by this Annual Report on Form 10-K. Disclosure controls and procedures are designed to ensure that the information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized, and reported on a timely basis and that such information is accumulated and reported to management, including our CEO and CFO, as appropriate, to allow timely decisions regarding required disclosures.
      At the time of the filing of our Annual Report on Form 10-K for the year ended December 31, 2004, our CEO and former CFO concluded that our disclosure controls and procedures were effective as of December 31, 2004. Subsequent to that evaluation, our CEO and current CFO concluded that our disclosure controls and procedures were not effective at a reasonable level of assurance, as of December 31, 2004, because of the material weaknesses discussed in the Annual Report on Form 10-K/A filed March 17, 2006. As described below under “Management’s Report on Internal Control Over Financial Reporting,” the Company continues

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to report material weaknesses in internal control over financial reporting as of December 31, 2005. The Company’s CEO and current CFO have concluded that, as of the end of the period covered by this Annual Report on Form 10-K, the Company’s disclosure controls and procedures were not effective at a reasonable level of assurance. Based upon the substantial work performed during the restatement process, management has concluded that the Company’s consolidated financial statements for the periods covered by and included in this Annual Report on Form 10-K are fairly stated in all material respects.
Management’s Report on Internal Control Over Financial Reporting
      Our management is responsible for establishing and maintaining adequate internal control over financial reporting as such term is defined in Exchange Act Rule 13a-15(f). Our management, including our CEO and current CFO, conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2005 using the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission in Internal Control-Integrated Framework (COSO framework). Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with policies or procedures may deteriorate.
      A material weakness is a control deficiency, or combination of control deficiencies, that results in more than a remote likelihood that a material misstatement of the annual or interim financial statements will not be prevented or detected.
      Our current management identified the following material weaknesses in our internal control over financial reporting as of December 31, 2005:
        1. Control environment. We did not maintain an effective control environment based on the criteria established in the COSO framework. Specifically, the Company did not maintain a control environment adequate to encourage the prevention or detection of the override of our controls or intentional misconduct, including misappropriation of assets and the preparation of false management reports, accounting records, financial statements and documents together with forged approval signatures. This lack of an effective control environment allowed our former CFO to take inappropriate actions that resulted in certain transactions not being properly reflected in our consolidated financial statements for the years ended December 31, 2004, 2003 and 2002, each of the quarters of 2004 and 2003, and the first three quarters of 2005. This intentional misconduct by our former CFO included the preparation of false accounting records and documents to deceive accounting personnel under his supervision, other members of senior management, our Board of Directors and our independent registered public accountants. Additionally, the lack of an effective control environment allowed our lines of communication among, and our monitoring of, our operations and accounting personnel, including our former CFO, to not be effective in preventing or detecting these instances of intentional misconduct. Taken as a whole, our control environment did not adequately emphasize appropriate judgment, skepticism and objectivity, and our former CFO intentionally exploited this environment for his personal benefit, specifically with respect to our controls over cash, payroll and property and equipment as follows:
        a. Cash. Our former CFO manipulated the process over the initiation and approval of cash wire transfers. This action was taken in order to accomplish the fraudulent diversion of cash from the Company to entities owned by our former CFO for goods and services which the Company neither requested nor received. False documentation was created by our former CFO to conceal the true nature of these transactions from the Company and its independent registered public accountants.
 
        b. Payroll. In 1999, our former CFO intentionally altered his payroll records to indicate that appropriate authorization had been given for a retroactive increase in his compensation and related benefits when in fact no such authorization had been provided. This false documentation was created by our former CFO to provide for an unauthorized increase to his compensation and to conceal the unauthorized compensation increase from the Company and its independent registered public accountants.

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        c. Property and Equipment. Our former CFO instructed certain former employees, who worked under his supervision, to alter management reports related to property and equipment expenditures. Additionally, our former CFO created fictitious property and equipment approval forms with forged signatures. These actions had the effect of concealing his inappropriate and fraudulent diversion of cash. The activities by our former CFO deceived the Company and its independent registered public accountants as to the true nature of the Company’s cash transfers and property and equipment expenditures.
      This control environment material weakness contributed to the embezzlement occurring, which in turn resulted in the restatement of our consolidated financial statements for the years ended December 31, 2004, 2003 and 2002, each of the quarters of 2004 and 2003, and the first three quarters of 2005. Additionally, this control environment material weakness could result in misstatements of any of our financial statement accounts that would result in a material misstatement to the annual or interim consolidated financial statements that would not be prevented or detected. Accordingly, our management has determined that this control deficiency constitutes a material weakness.
      The material weakness in our control environment contributed to the existence of the following additional material weakness in controls over property and equipment as described below:
        2. Controls over property and equipment. We did not maintain effective controls over the completeness and accuracy of our accounting for property and equipment. Specifically, our controls were not adequate to ensure (i) the timely and accurate depreciation of all property and equipment, (ii) the identification and recording of all property and equipment retirements when they occurred, and (iii) that property and equipment transferred between our locations was accurately and completely reflected in our accounting records. This control deficiency resulted in certain inaccuracies in our accounting for property and equipment and in the restatement of our consolidated financial statements for the years ended December 31, 2004, 2003 and 2002; each of the quarters of 2004 and 2003; and the first three quarters of 2005. Additionally, this control deficiency could result in a misstatement of our property and equipment and related depreciation expense accounts that would result in a material misstatement to the annual or interim consolidated financial statements that would not be prevented or detected. Accordingly, our management has determined that this control deficiency constitutes a material weakness.
      Our management, including our CEO and current CFO, have concluded that as a result of the material weaknesses described above, we did not maintain effective internal control over financial reporting as of December 31, 2005, based on the criteria in Internal Control-Integrated Framework issued by the COSO.
      Our assessment of the effectiveness of our internal control over financial reporting as of December 31, 2005 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which begins on page F-2 of this Annual Report on Form 10-K.
Changes in Internal Control Over Financial Reporting
      Management is committed to remediating each of the material weaknesses identified above by implementing changes to the Company’s internal control over financial reporting. Management has implemented, or is in the process of implementing, the following changes to the Company’s internal control systems and procedures:
        We are strengthening our tracking system for property and equipment to improve the tracking of those assets between our yards and rigs and to trigger the timely commencement of depreciation of assets placed in service.
 
        We are implementing procedures and processes to reinforce with our employees their responsibilities to exercise independence and judgment and to comply with the Company’s compliance programs, including:
  •  formal certifications of information contained in SEC filings relating to their areas of responsibility;

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  •  annual written questionnaires from senior employees and accounting staff with respect to awareness as to questionable business practices;
 
  •  improved education and training programs for all employees covering ethics, compliance, financial reporting and good business practices;
 
  •  additional guidelines with respect to senior management’s responsibilities for SEC filings, financial reports, budgets and maintenance of controls over assets and expenditures; and
 
  •  annual reporting to the Audit Committee with respect to these processes and procedures.
        In addition, we will initiate a search for an in-house counsel whose responsibilities will include an active role in corporate compliance and governance.
 
        We have initiated structural changes and processes and procedures to increase communications between the financial reporting and accounting functions and operations and between the financial reporting and accounting functions and senior management.
      Additionally, management is committed to continued improvements in controls. In this regard, we are revising our internal audit reporting structure to further enhance its direct reporting to the audit committee and its program of monitoring controls.
      During the fourth quarter of 2005, we changed our wire transfer approval policies to require additional and more secure authorizations for wires to ensure that all wire transfers are to approved vendors, and to ensure that all such transactions are reflected in the Company’s accounts payable system and have appropriate supporting documentation. We also revised our property and equipment expenditure requirements to provide for improved controls over the authorization of fixed asset acquisitions. We have evaluated the design of these new procedures, placed them in operation for a sufficient period of time, and subjected them to appropriate tests in order to conclude that they are operating effectively. These changes remediated the material weakness in controls over cash that was reported in Management’s Report on Internal Control Over Financial Reporting included in the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2004 (“Management’s 2004 Report”). In addition, these changes remediated the control failure over the authorization of property and equipment acquisitions as reported in Management’s 2004 Report.
      Other than the changes described above, there have been no other changes in our internal control over financial reporting during the most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. The remaining remediation activities noted above were initiated in the fourth quarter of 2005 and the remaining controls will be implemented in 2006.
Item 9B.     Other Information
      None.

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PART III
      The information required by Part III is omitted from this Report because we will file a definitive proxy statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 no later than 120 days after the end of the fiscal year covered by this Report and certain information included therein is incorporated herein by reference.
Item 10. Directors and Executive Officers of the Registrant.
      The information required by this Item is incorporated herein by reference to the Proxy Statement.
Item 11. Executive Compensation.
      The information required by this Item is incorporated herein by reference to the Proxy Statement.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.
      The information required by this Item is incorporated herein by reference to the Proxy Statement.
Item 13. Certain Relationships and Related Transactions.
      The information required by this Item is incorporated herein by reference to the Proxy Statement.
Item 14. Principal Accountant Fees and Services.
      The information required by this Item is incorporated herein by reference to the Proxy Statement.

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PART IV
Item 15. Exhibits and Financial Statement Schedule.
      (a)(1) Financial Statements
      See Index to Consolidated Financial Statements on page F-1 of this Report.
      (a)(2) Financial Statement Schedule
      Schedule II — Valuation and qualifying accounts is filed herewith on page S-1.
      All other financial statement schedules have been omitted because they are not applicable or the information required therein is included elsewhere in the financial statements or notes thereto.
      (a)(3) Exhibits
      The following exhibits are filed herewith or incorporated by reference herein.
         
  3 .1   Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
  3 .2   Amendment to Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
  3 .3   Amended and Restated Bylaws (filed March 19, 2002 as Exhibit 3.2 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
  4 .1   Rights Agreement dated January 2, 1997, between Patterson Energy, Inc. and Continental Stock Transfer & Trust Company (filed January 14, 1997 as Exhibit 2 to the Company’s Registration Statement on Form 8-A and incorporated herein by reference).
  4 .2   Amendment to Rights Agreement dated as of October 23, 2001 (filed October 31, 2001 as Exhibit 3.4 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2001 and incorporated herein by reference).
  4 .3   Restated Certificate of Incorporation, as amended (See Exhibits 3.1 and 3.2).
  4 .4   Registration Rights Agreement with Bear, Stearns and Co. Inc., dated March 25, 1994, as assigned by REMY Capital Partners III, L.P.(filed March 19, 2002 as Exhibit 4.3 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
  10 .1   For additional material contracts, see Exhibits 4.1, 4.2 and 4.4.
  10 .2   Patterson-UTI Energy, Inc., 1993 Stock Incentive Plan, as amended (filed March 13, 1998 as Exhibit 10.1 to the Company’s Registration Statement on Form S-8 (File No. 333-47917) and incorporated herein by reference).*
  10 .3   Patterson-UTI Energy, Inc. Non-Employee Directors’ Stock Option Plan, as amended (filed November 4, 1997 as Exhibit 10.1 to the Company’s Registration Statement on Form S-8 (File No. 333-39471) and incorporated herein by reference).*
  10 .4   Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (filed November 27, 2002 as Exhibit 4.4 to Post Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8 (File No. 333-60470) and incorporated herein by reference).*
  10 .5   Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed July 28, 2003 as Exhibit 4.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 and incorporated herein by reference).*
  10 .6   Amendment to the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed August 9, 2004 as Exhibit 10.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*

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  10 .7   Amended and Restated Patterson-UTI Energy, Inc. Non-Employee Director Stock Option Plan(filed July 28, 2003 as Exhibit 4.8 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 and incorporated herein by reference).*
  10 .8   Amended and Restated Patterson-UTI Energy, Inc. 1996 Employee Stock Option Plan (filed July 25, 2001 as Exhibit 4.4 to Post-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8 (File No. 333-60466) and incorporated herein by reference).*
  10 .9   1997 Stock Option Plan of DSI Industries, Inc. (filed July 25, 2001 as Exhibit 4.4 to Post-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8 (File No. 333-60470) and incorporated herein by reference).*
  10 .10   Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, including Form of Executive Officer Restricted Stock Award Agreement, Form of Executive Officer Stock Option Agreement, Form of Non-Employee Director Restricted Stock Award Agreement and Form of Non-Employee Director Stock Option Agreement (filed June 15, 2005 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference).*
  10 .11   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed August 9, 2004 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .12   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and Cloyce A. Talbott (filed August 9, 2004 as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .13   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and A. Glenn Patterson (filed August 9, 2004 as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .14   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed August 9, 2004 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .15   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed August 9, 2004 as Exhibit 10.6 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .16   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed on February 4, 2004 as Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .17   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and A. Glenn Patterson (filed on February 4, 2004 as Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .18   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Cloyce A. Talbott (filed on February 4, 2004 as Exhibit 10.4 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .19   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed on February 4, 2004 as Exhibit 10.5 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .20   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed on February 4, 2004 as Exhibit 10.7 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .21   Form of Letter Agreement regarding termination, effective as of January 29, 2004, entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Kenneth N. Berns and John E. Vollmer III (filed on February 25, 2005 as Exhibit 10.23 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).*

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  10 .22   Form of Indemnification Agreement entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Cloyce A. Talbott, A. Glenn Patterson, Kenneth N. Berns, Robert C. Gist, Curtis W. Huff, Terry H. Hunt, Kenneth R. Peak, Nadine C. Smith and John E. Vollmer III (filed April 28, 2004 as Exhibit 10.11 to the Company’s Annual Report on Form 10-K, as amended, for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .23   Credit Agreement dated as of December 17, 2004 among Patterson-UTI Energy, Inc., as the Borrower, Bank of America, N.A., as administrative agent, L/ C Issuer and a Lender and the other lenders and agents party thereto (filed on December 23, 2004 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
  10 .24   Summary Description of 2005 Bonus Compensation Program (filed on April 29, 2005 in the Company’s Current Report on Form 8-K and incorporated herein by reference).*
  10 .25   Summary Description of Director Compensation (filed on February 25, 2005 as Exhibit 10.27 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).*
  14 .1   Patterson-UTI Energy, Inc. Code of Business Conduct and Ethics for Senior Financial Executives (filed on February 4, 2004 as Exhibit 14.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).
  21 .1   Subsidiaries of the Registrant.
  23 .1   Consent of Independent Registered Public Accounting Firm.
  31 .1   Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.
  31 .2   Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.
  32 .1   Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 USC Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
 
Management Contract or Compensatory Plan identified as required by Item 15(a)(3) of Form 10-K.

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INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
         
    Page
     
Report of Independent Registered Public Accounting Firm
    F-2  
Consolidated Financial Statements:
       
Consolidated Balance Sheets as of December 31, 2005 and 2004
    F-5  
Consolidated Statements of Income for the years ended December 31, 2005, 2004 and 2003
    F-6  
Consolidated Statements of Changes In Stockholders’ Equity for the years ended December 31, 2005, 2004 and 2003
    F-7  
Consolidated Statements of Changes In Cash Flows for the years ended December 31, 2005, 2004 and 2003
    F-8  
Notes to Consolidated Financial Statements
    F-9  
Financial Statement Schedule
    S-1  

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Report of Independent Registered Public Accounting Firm
To the Board of Directors and Stockholders of
Patterson-UTI Energy, Inc.
      We have completed integrated audits of Patterson-UTI Energy, Inc.’s 2005 and 2004 consolidated financial statements and of its internal control over financial reporting as of December 31, 2005, and an audit of its 2003 consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Our opinions, based on our audits, are presented below.
Consolidated financial statements and financial statement schedule
      In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of Patterson-UTI Energy, Inc. and its subsidiaries at December 31, 2005 and 2004, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2005 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. These financial statements and financial statement schedule are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements and financial statement schedule based on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit of financial statements includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
      As discussed in Note 2 to the consolidated financial statements, the Company restated its 2004 and 2003 consolidated financial statements.
Internal control over financial reporting
      Also, we have audited management’s assessment, included in Management’s Report on Internal Control Over Financial Reporting appearing under Item 9A, that Patterson-UTI Energy, Inc. did not maintain effective internal control over financial reporting as of December 31, 2005, because the Company did not maintain (1) an effective control environment and (2) effective controls over property and equipment, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express opinions on management’s assessment and on the effectiveness of the Company’s internal control over financial reporting based on our audit.
      We conducted our audit of internal control over financial reporting in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. An audit of internal control over financial reporting includes obtaining an understanding of internal control over financial reporting, evaluating management’s assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we consider necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinions.
      A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over

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financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
      Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
      A material weakness is a control deficiency, or combination of control deficiencies, that results in more than a remote likelihood that a material misstatement of the annual or interim financial statements will not be prevented or detected. The following material weaknesses have been identified and included in management’s assessment as of December 31, 2005.
        1. Control environment. The Company did not maintain an effective control environment based on the criteria established in the COSO framework. Specifically, the Company did not maintain a control environment adequate to encourage the prevention or detection of the override of controls or intentional misconduct, including misappropriation of assets and the preparation of false management reports, accounting records, financial statements and documents together with forged approval signatures. This lack of an effective control environment allowed the Company’s former CFO to take inappropriate actions that resulted in certain transactions not being properly reflected in the Company’s consolidated financial statements for the years ended December 31, 2004, 2003 and 2002, each of the quarters of 2004 and 2003, and the first three quarters of 2005. This intentional misconduct by the Company’s former CFO included the preparation of false accounting records and documents to deceive accounting personnel under his supervision, other members of senior management, the Board of Directors and its independent registered public accountants. Additionally, the lack of an effective control environment allowed the Company’s lines of communication among, and their monitoring of, their operations and accounting personnel, including their former CFO, to not be effective in preventing or detecting these instances of intentional misconduct. Taken as a whole, the Company’s control environment did not adequately emphasize appropriate judgment, skepticism and objectivity, and their former CFO intentionally exploited this environment for his personal benefit, specifically with respect to the Company’s controls over cash, payroll and property and equipment as follows:
        a. Cash. The Company’s former CFO manipulated the process over the initiation and approval of cash wire transfers. This action was taken in order to accomplish the fraudulent diversion of cash from the Company to entities owned by their former CFO for goods and services which the Company neither requested nor received. False documentation was created by the Company’s former CFO to conceal the true nature of these transactions from the Company and its independent registered public accountants.
 
        b. Payroll. In 1999, the Company’s former CFO intentionally altered his payroll records to indicate that appropriate authorization had been given for a retroactive increase in his compensation and related benefits when in fact no such authorization had been provided. This false documentation was created by the Company’s former CFO to provide for an unauthorized increase to his compensation and to conceal the unauthorized compensation increase from the Company and its independent registered public accountants.
 
        c. Property and Equipment. The Company’s former CFO instructed certain former employees, who worked under his supervision, to alter management reports related to property and equipment expenditures. Additionally, the Company’s former CFO created fictitious property and equipment approval forms with forged signatures. These actions had the effect of concealing his

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  inappropriate and fraudulent diversion of cash. The activities by the Company’s former CFO deceived the Company and its independent registered public accountants as to the true nature of the Company’s cash transfers and property and equipment expenditures.
      The Company’s material weakness in its control environment contributed to the existence of the material weakness in controls over property and equipment as described below:
        2. Controls over property and equipment. The Company did not maintain effective controls over the completeness and accuracy of their accounting for property and equipment. Specifically, the Company’s controls were not adequate to ensure (i) the timely and accurate depreciation of all property and equipment, (ii) the identification and recording of all property and equipment retirements when they occurred, and (iii) that property and equipment transferred between Company locations was accurately and completely reflected in their accounting records. This control deficiency resulted in certain inaccuracies in the Company’s accounting for property and equipment.
      The control deficiencies described above resulted in the restatement of the Company’s consolidated financial statements for the years ended December 31, 2004, 2003 and 2002, each of the quarters of 2004 and 2003, and the first three quarters of 2005. Additionally, each of the control deficiencies described above could result in a misstatement in the aforementioned accounts or disclosures that would result in a material misstatement in the Company’s annual or interim consolidated financial statement that would not be prevented or detected. Accordingly, the Company’s management has determined that each of these control deficiencies constitute material weaknesses.
      These material weaknesses were considered in determining the nature, timing, and extent of audit tests applied in our audit of the 2005 consolidated financial statements, and our opinion regarding the effectiveness of the Company’s internal control over financial reporting does not affect our opinion on those consolidated financial statements.
      In our opinion, management’s assessment that Patterson-UTI Energy, Inc. did not maintain effective internal control over financial reporting as of December 31, 2005, is fairly stated, in all material respects, based on criteria established in Internal Control — Integrated Framework issued by the COSO. Also, in our opinion, because of the effects of the material weaknesses described above on the achievement of the objectives of the control criteria, Patterson-UTI Energy, Inc. has not maintained effective internal control over financial reporting as of December 31, 2005, based on criteria established in Internal Control — Integrated Framework issued by the COSO.
PricewaterhouseCoopers LLP
Houston, Texas
March 29, 2006

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
                       
    December 31,
     
        Restated
        (See Note 2)
    2005   2004
         
    (In thousands,
    except share data)
ASSETS
Current assets:
               
 
Cash and cash equivalents
  $ 136,398     $ 112,371  
 
Accounts receivable, net of allowance for doubtful accounts of $2,199 and $1,909 at December 31, 2005 and 2004, respectively
    422,002       214,097  
 
Inventory
    27,907       17,738  
 
Deferred tax assets, net
    26,382       15,991  
 
Other
    25,168       26,836  
             
     
Total current assets
    637,857       387,033  
Property and equipment, at cost, net
    1,053,845       765,019  
Goodwill
    99,056       99,056  
Other
    5,023       5,677  
             
     
Total assets
  $ 1,795,781     $ 1,256,785  
             
 
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
               
 
Accounts payable:
               
   
Trade
  $ 113,226     $ 54,553  
   
Accrued revenue distributions
    13,379       11,297  
   
Other
    5,294       2,309  
 
Accrued Federal and state income taxes payable
    11,034       4,231  
 
Accrued expenses
    112,476       79,163  
             
     
Total current liabilities
    255,409       151,553  
Deferred tax liabilities, net
    169,188       140,475  
Other
    4,173       3,256  
             
     
Total liabilities
    428,770       295,284  
             
Commitments and contingencies
           
Stockholders’ equity:
               
 
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued
           
 
Common stock, par value $.01; authorized 300,000,000 shares with 175,909,274 and 171,625,841 issued and 172,441,178 and 168,512,745 outstanding at December 31, 2005 and 2004, respectively
    1,759       1,716  
 
Additional paid-in capital
    672,151       597,280  
 
Deferred compensation
    (9,287 )     (5,420 )
 
Retained earnings
    719,113       373,712  
 
Accumulated other comprehensive income, net of tax
    8,565       7,350  
 
Treasury stock, at cost, 3,468,096 shares and 3,113,096 (affected by a two-for-one stock split) shares at December 31, 2005 and 2004, respectively
    (25,290 )     (13,137 )
             
     
Total stockholders’ equity
    1,367,011       961,501  
             
     
Total liabilities and stockholders’ equity
  $ 1,795,781     $ 1,256,785  
             
The accompanying notes are an integral part of these consolidated financial statements.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME
                             
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003
             
    (In thousands, except per share data)
Operating revenues:
                       
 
Contract drilling
  $ 1,485,684     $ 809,691     $ 639,694  
 
Pressure pumping
    93,144       66,654       46,083  
 
Drilling and completion fluids
    122,011       90,557       69,230  
 
Oil and natural gas
    39,616       33,867       21,163  
                   
      1,740,455       1,000,769       776,170  
                   
Operating costs and expenses:
                       
 
Contract drilling
    776,313       556,869       475,224  
 
Pressure pumping
    54,956       37,561       26,184  
 
Drilling and completion fluids
    98,530       76,503       61,424  
 
Oil and natural gas
    9,566       7,978       4,808  
 
Depreciation, depletion and impairment
    156,393       122,800       100,834  
 
Selling, general and administrative
    39,110       31,983       27,685  
 
Bad debt expense
    1,231       897       259  
 
Embezzled funds and related expenses
    20,043       19,122       17,849  
 
Other (including gain or loss on sale of assets)
    3,017       (1,411 )     (4,379 )
                   
      1,159,159       852,302       709,888  
                   
Operating income
    581,296       148,467       66,282  
                   
Other income (expense):
                       
 
Interest income
    3,551       1,140       1,116  
 
Interest expense
    (516 )     (695 )     (292 )
 
Other
    428       235       1,870  
                   
      3,463       680       2,694  
                   
Income before income taxes and cumulative effect of change in accounting principle
    584,759       149,147       68,976  
                   
Income tax expense (benefit):
                       
 
Current
    194,918       39,952       15,324  
 
Deferred
    17,101       14,849       9,996  
                   
      212,019       54,801       25,320  
                   
Income before cumulative effect of change in accounting principle
    372,740       94,346       43,656  
Cumulative effect of change in accounting principle, net of related income tax benefit of approximately $287
                (469 )
                   
Net income
  $ 372,740     $ 94,346     $ 43,187  
                   
Net income per common share:
                       
 
Basic:
                       
   
Income before cumulative effect of change in accounting principle
  $ 2.19     $ 0.57     $ 0.27  
                   
   
Cumulative effect of change in accounting principle
  $     $     $  
                   
   
Net income
  $ 2.19     $ 0.57     $ 0.27  
                   
 
Diluted:
                       
   
Income before cumulative effect of change in accounting principle
  $ 2.15     $ 0.56     $ 0.27  
                   
   
Cumulative effect of change in accounting principle
  $     $     $  
                   
   
Net income
  $ 2.15     $ 0.56     $ 0.26  
                   
 
Weighted average number of common shares outstanding:
                       
   
Basic
    170,426       166,258       161,272  
                   
   
Diluted
    173,767       169,211       164,572  
                   
The accompanying notes are an integral part of these consolidated financial statements.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY
                                                                   
                    Accumulated        
    Common Stock               Other        
        Additional           Comprehensive        
    Number       Paid-In   Deferred   Retained   Income   Treasury    
    of Shares   Amount   Capital   Compensation   Earnings   (Loss)   Stock   Total
                                 
December 31, 2002, as previously reported
    81,577     $ 816     $ 489,201     $     $ 261,208     $ (1,839 )   $ (11,655 )   $ 737,731  
 
Adjustment for effects of embezzlement (net of applicable income tax benefit of $7,622)(See Note 2)
                            (12,499 )                 (12,499 )
 
Other adjustments (net of applicable income tax benefit of $691) (See Note 2)
                            (1,659 )     675             (984 )
                                                 
December 31, 2002, as restated (See Note 2)
    81,577       816       489,201             247,050       (1,164 )     (11,655 )     724,248  
 
Exercise of stock options and warrants
    906       9       10,277                               10,286  
 
Tax benefit related to exercise of stock options
                6,540                               6,540  
 
Foreign currency translation adjustment, (net of tax of $3,220)
                                  5,553             5,553  
 
Net income, as restated (See Note 2)
                            43,187                   43,187  
                                                 
December 31, 2003, as restated (See Note 2)
    82,483       825       506,018             290,237       4,389       (11,655 )     789,814  
 
Issuance of common stock for acquisition
    1,388       14       49,462                               49,476  
 
Issuance of restricted stock
    189       2       6,640       (6,642 )                        
 
Amortization of deferred compensation expense
                      1,222                         1,222  
 
Exercise of stock options and warrants
    2,580       25       24,494                               24,519  
 
Tax benefit related to exercise of stock options
                10,666                               10,666  
 
Foreign currency translation adjustment, (net of tax of $1,716)
                                  2,961             2,961  
 
Purchase of treasury stock
                                        (1,482 )     (1,482 )
 
Payment of cash dividend (see Note 12)
                            (10,021 )                 (10,021 )
 
Effect of two-for-one stock split (see Note 12)
    84,986       850                   (850 )                  
 
Net income, as restated (See Note 2)
                            94,346                   94,346  
                                                 
December 31, 2004, as restated (See Note 2)
    171,626       1,716       597,280       (5,420 )     373,712       7,350       (13,137 )     961,501  
 
Issuance of restricted stock
    305       3       8,040       (8,043 )                        
 
Amortization of deferred compensation expense
                      2,825                         2,825  
 
Forfeitures of restricted shares
    (65 )           (1,351 )     1,351                          
 
Exercise of stock options
    4,043       40       43,434                               43,474  
 
Tax benefit related to exercise of stock options
                24,748                               24,748  
 
Foreign currency translation adjustment, (net of tax of $705)
                                  1,215             1,215  
 
Purchase of treasury stock
                                        (12,153 )     (12,153 )
 
Payment of cash dividend (see Note 12)
                            (27,339 )                 (27,339 )
 
Net income
                            372,740                   372,740  
                                                 
December 31, 2005
    175,909     $ 1,759     $ 672,151     $ (9,287 )   $ 719,113     $ 8,565     $ (25,290 )   $ 1,367,011  
                                                 
The accompanying notes are an integral part of these consolidated financial statements.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CHANGES IN CASH FLOWS
                               
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003
             
    (In thousands)
Cash flows from operating activities:
                       
 
Net income
  $ 372,740     $ 94,346     $ 43,187  
 
Adjustments to reconcile net income to net cash provided by operating activities:
                       
 
Depreciation, depletion and impairment
    156,393       122,800       100,834  
 
Provision for bad debts
    1,231       897       259  
 
Deferred income tax expense
    17,101       14,849       9,996  
 
Tax benefit related to exercise of stock options
    24,748       10,666       6,540  
 
Amortization of deferred compensation expense
    2,825       1,222        
 
Gain on sale of assets
    (1,253 )     (1,411 )     (1,927 )
 
Cumulative effect of change in accounting principle, net of tax
                (469 )
   
Changes in operating assets and liabilities, net of business acquired:
                       
     
Accounts receivable
    (208,248 )     (50,682 )     (55,791 )
     
Federal income taxes receivable
    7,068       15,734       11,155  
     
Inventory and other current assets
    (9,402 )     (13,556 )     (8,984 )
     
Accounts payable
    60,860       12,861       12,322  
     
Accrued expenses
    32,514       1,555       22,814  
     
Other liabilities
    3,902       (6,090 )     5,015  
                   
   
Net cash provided by operating activities
    460,479       203,191       144,951  
                   
Cash flows from investing activities:
                       
 
Acquisitions, net of cash acquired
    (73,577 )     (30,387 )     (40,832 )
 
Purchases of property and equipment
    (380,094 )     (174,589 )     (98,801 )
 
Proceeds from sales of property and equipment
    12,674       3,303       4,548  
 
Change in other assets
    1,766       (1,766 )     (1,693 )
                   
   
Net cash used in investing activities
    (439,231 )     (203,439 )     (136,778 )
                   
Cash flows from financing activities:
                       
 
Purchase of treasury stock
    (12,153 )     (1,482 )      
 
Dividends paid
    (27,339 )     (10,021 )      
 
Line of credit issuance costs
          (780 )      
 
Proceeds from exercise of stock options and warrants
    43,474       24,519       10,286  
                   
   
Net cash provided by financing activities
    3,982       12,236       10,286  
                   
   
Effect of foreign exchange rate changes on cash
    (1,203 )     (100 )     (130 )
                   
     
Net increase in cash and cash equivalents
    24,027       11,888       18,329  
Cash and cash equivalents at beginning of year
    112,371       100,483       82,154  
                   
Cash and cash equivalents at end of year
  $ 136,398     $ 112,371     $ 100,483  
                   
Supplemental disclosure of cash flow information:
                       
 
Net cash received (paid) during the year for:
                       
     
Interest expense
  $ (418 )   $ (245 )   $ (292 )
     
Income taxes
    (156,709 )     (12,500 )     2,730  
The accompanying notes are an integral part of these consolidated financial statements.

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
1. Description of Business and Summary of Significant Accounting Policies
A description of the business and basis of presentation follows:
      Description of business — Patterson-UTI Energy, Inc., together with its wholly-owned subsidiaries, (collectively referred to herein as “Patterson-UTI” or the “Company”) is a leading provider of onshore contract drilling services to major and independent oil and natural gas operators in Texas, New Mexico, Oklahoma, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, South Dakota and Western Canada. As of December 31, 2005, the Company owned 403 drilling rigs. The Company provides pressure pumping services to oil and natural gas operators primarily in the Appalachian Basin. The Company provides drilling fluids, completion fluids and related services to oil and natural gas operators offshore in the Gulf of Mexico and on land in Texas, Southeastern New Mexico, Oklahoma and the Gulf Coast region of Louisiana. The Company is also engaged in the development, exploration, acquisition and production of oil and natural gas. The Company’s oil and natural gas business operates primarily in producing regions of West and South Texas, Southeastern New Mexico, Utah and Mississippi.
      Embezzlement and Restatement — The Company’s former Chief Financial Officer (“CFO”) perpetrated an embezzlement over a period of more than five years. The accompanying 2004 and 2003 consolidated financial statements have been restated to reflect the effects of losses incurred as a result of the embezzlement in the periods of occurrence. Payments related to the embezzlement previously capitalized as property and equipment and goodwill acquired, and the related depreciation and other amounts expensed have been reversed from the Company’s accounting records. Embezzled payments have been recognized as expense in the periods they were embezzled. The cumulative effects of the embezzlement prior to 2002, have been recognized as a reduction of retained earnings. The accompanying consolidated financial statements have also been restated for the effects of the correction of other errors that are immaterial both individually and in the aggregate (See Note 2).
      Basis of presentation — As a result of the Company increasing its ownership of TMBR/Sharp Drilling, Inc. (“TMBR”) from 19.5% to 100% in 2004, the consolidated financial statements of Patterson-UTI Energy, Inc. and its wholly-owned subsidiaries have been restated in accordance with the requirements of accounting for business combinations accounted for as a purchase, to provide for the retroactive application of the equity method of accounting for the Company’s investment in TMBR (see Note 7).
      The U.S. dollar is the functional currency for all of the Company’s operations except for its Canadian operations, which use the Canadian dollar as their functional currency. The effects of exchange rate changes are reflected in accumulated other comprehensive income, which is a separate component of stockholders’ equity.
      On April 28, 2004, the Company’s Board of Directors authorized a two-for-one stock split in the form of a stock dividend which was distributed on June 30, 2004 to holders of record on June 14, 2004. At June 30, 2004, an adjustment was made to reclassify an amount from retained earnings to common stock to account for the par value of the common stock issued as a stock dividend. This adjustment had no overall effect on equity. Historical earnings per share amounts included in the Statements of Income and elsewhere in these financial statements have been restated as if the two-for-one stock split had occurred on January 1, 2003.
A summary of the significant accounting policies follows:
      Principles of consolidation — The consolidated financial statements include the accounts of Patterson-UTI and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. The Company has no controlling financial interests in any entity which would require consolidation.

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      Management estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from such estimates.
      Revenue recognition — Revenues are recognized when services are performed, except for revenues earned under turnkey contract drilling arrangements which are recognized using the completed contract method of accounting, as described below. The Company follows the percentage-of-completion method of accounting for footage contract drilling arrangements. Under the percentage-of-completion method, management estimates are relied upon in the determination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling arrangements and risks therein, the Company follows the completed contract method of accounting for such arrangements. Under this method, all drilling revenues and expenses related to a well in progress are deferred and recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses are expected to exceed estimated total revenues. The Company recognizes reimbursements received from third parties for out-of-pocket expenses incurred as revenues and accounts for these out-of-pocket expenses as direct costs.
      Accounts receivable — Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful accounts represents the Company’s estimate of the amount of probable credit losses existing in the Company’s accounts receivable. The Company reviews the adequacy of its allowance for doubtful accounts monthly. Significant individual accounts receivable balances and balances which have been outstanding greater than 90 days are reviewed individually for collectibility. Account balances, when determined to be uncollectible, are charged against the allowance.
      Inventories — Inventories consist primarily of chemical products to be used in conjunction with the Company’s drilling and completion fluids activities. The inventories are stated at the lower of cost or market, determined by the first-in, first-out method.
      Property and equipment — Property and equipment is carried at cost less accumulated depreciation. Depreciation is provided on the straight-line method over the estimated useful lives. The method of depreciation does not change when equipment becomes idle. The estimated useful lives, in years, are defined below.
         
    Useful Lives
     
Drilling rigs and related equipment
    2-15  
Office furniture
    3-10  
Buildings
    5-20  
Automotive equipment
    2-7  
Other
    3-7  
      Oil and natural gas properties — Oil and natural gas properties are accounted for using the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to expense when such determination is made. Costs of exploratory wells are initially capitalized to wells in progress until the outcome of the drilling is known. The Company reviews wells in progress quarterly to determine the related reserve classification. If the reserve classification is uncertain after one year following the completion of drilling, the Company considers the costs of the well to be impaired and recognizes the costs as expense. Geological and geophysical costs, including seismic costs, and costs to carry and retain undeveloped properties are charged to expense when incurred. The capitalized costs of both developmental

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates of proved oil and natural gas reserves of each respective field. The Company reviews its proved oil and natural gas properties for impairment when an event occurs such as downward revisions in reserve estimates or decreases in oil and natural gas prices. Proved properties are grouped by field and undiscounted cash flow estimates are provided by an independent petroleum engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the difference between its net book value and discounted cash flow. Unproved oil and natural gas properties are reviewed quarterly to determine impairment. The Company’s intent to drill, lease expiration and abandonment of area are considered. Assessment of impairment is made on a lease-by-lease basis. If an unproved property is determined to be impaired, costs related to that property are expensed.
      Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. As such, the Company assesses impairment of its goodwill annually or on an interim basis if events or circumstances indicate that the fair value of the asset has decreased below its carrying value.
      The following table summarizes depreciation, depletion and impairment expense for 2005, 2004 and 2003 (in millions):
                           
        Restated
        (See Note 2)
         
    2005   2004   2003
             
Depreciation expense
  $ 141.7     $ 109.4     $ 93.7  
Depletion expense
    10.3       10.1       5.6  
Amortization expense
          0.1       0.1  
Impairment of oil and natural gas properties
    4.4       3.2       1.4  
                   
 
Total
  $ 156.4     $ 122.8     $ 100.8  
                   
      Maintenance and repairs — Maintenance and repairs are charged to expense when incurred. Renewals and betterments which extend the life or improve existing property and equipment are capitalized.
      Retirements — Upon disposition or retirement of property and equipment, the cost and related accumulated depreciation are removed and any resulting gain or loss is credited or charged to operations.
      Investments in equity securities — Investments in equity securities are accounted for under the equity method of accounting.
      Earnings per share — The Company provides a dual presentation of its earnings per share; Basic Earnings per Share (“Basic EPS”) and Diluted Earnings per Share (“Diluted EPS”). Basic EPS is computed using the weighted average number of shares outstanding during the year. Diluted EPS includes common stock equivalents which are dilutive to earnings per share. For the years ended December 31, 2005, 2004 and 2003, dilutive securities, consisting of certain stock options and warrants (See Note 12), included in the calculation of Diluted EPS were 3.3 million shares, 3.0 million shares and 3.3 million shares, respectively. At December 31, 2005, there were no potentially dilutive securities and at December 31, 2004 and 2003, there were potentially dilutive securities of 640,000 and 1.9 million, respectively, excluded from the calculation of Diluted EPS as their exercise prices were greater than the average market price for the respective year.
      Income taxes — The asset and liability method is used in accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for operating loss and tax credit carryforwards and for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which those temporary differences

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of operations in the period that includes the enactment date. If applicable, a valuation allowance is recorded to reduce the carrying amounts of deferred tax assets unless it is more likely than not that such assets will be realized.
      Stock based compensation — During June 2005, the Company’s shareholders approved the Patterson-UTI Energy, Inc. 2005 long-Term Incentive Plan (the “2005 Plan”). In addition, the Board of Directors adopted a resolution that no future grants would be made under any of the previously existing equity plans of the Company. The Company accounts for activity under the 2005 Plan and previous activity of its other equity plans using the recognition and measurement principles of APB Opinion No. 25, Accounting for Stock Issued to Employees (“APB 25”), and related interpretations. During the second quarters of 2004 and 2005 and the third quarter of 2005, the company granted restricted shares of the Company’s common stock (the “Restricted Shares”) to certain key employees under the Patterson-UTI Energy, Inc. 1997 Long-Term Incentive Plan, as amended, and the 2005 Plan. As required by APB 25, the Restricted Shares were valued based upon the market price of the Company’s common stock on the date of the grant. The resulting value is being amortized over the vesting period of the stock. For the years ended December 31, 2005 and 2004, compensation expense of $1.8 million and $773,000, net of $327,000 and $5,000 of forfeitures and of $1.0 million and $449,000 of taxes, respectively, was included as a reduction in net income. Other than the restricted Shares discussed above, no additional stock-based employee compensation expense is reflected in net income, as all options granted under the plans discussed above had an exercise price equal to the market value of the underlying common stock on the date of grant. The following table illustrates the effect on net income and net income per share if the Company had applied the fair value recognition provisions of Financial Accounting Standards Board Statement No. 123, Accounting for Stock-Based Compensation (“SFAS 123”), to stock-based employee compensation (in thousands, except per share amounts):
                           
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003
             
Net income, as reported
  $ 372,740     $ 94,346     $ 43,187  
Add: Stock-based employee compensation expense recorded, net of forfeitures and taxes
    1,795       773        
Deduct: Total stock-based employee compensation expense determined under fair value based method for all awards, net of related tax effects(1)
    (11,119 )     (12,304 )     (10,506 )
                   
Pro forma net income
  $ 363,416     $ 82,815     $ 32,681  
                   
Earnings per share:
                       
 
Basic, as reported
  $ 2.19     $ 0.57     $ 0.27  
                   
 
Basic, pro forma
  $ 2.13     $ 0.50     $ 0.20  
                   
 
Diluted, as reported
  $ 2.15     $ 0.56     $ 0.26  
                   
 
Diluted, pro forma
  $ 2.11     $ 0.49     $ 0.20  
                   
Weighted-average fair value per share of options granted(1)
  $ 6.33     $ 6.25     $ 5.59  
 
(1)  See Note 13 for additional information regarding the computations presented here.
      Statement of cash flows — For purposes of reporting cash flows, cash and cash equivalents include cash on deposit, money market funds and investment grade municipal and commercial bonds with original maturities of 90 days or less.

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      Recently Issued Accounting Standards — The Financial Accounting standards Board (“FASB”) issued Staff Position FIN 47, Accounting for Conditional Asset Retirement Obligations (“FIN 47”), an interpretation of FASB Statement No. 143, in March 2005. The statement clarifies the term “conditional asset retirement obligation” as used in FASB 143. The provisions of FIN 47, which the Company adopted on December 31, 2005, did not have a material impact on the Company’s financial position or results of operations.
      The FASB issued Statement of Financial Accounting Standard No. 123 (revised 2004), Share-Based Payment (“SFAS 123(R)”) in December 2004; it replaces FASB Statement of Financial Accounting Standards No. 123, Accounting for Stock-Based Compensation, and supersedes Accounting Principles Board Opinion No. 25, Accounting for Stock Issued to Employees. Under SFAS 123(R), companies would have been required to implement the standard as of the beginning of the first interim reporting period that begins after June 15, 2005. However, in April 2005, the SEC announced the adoption of an Amendment to Rule 4-01(a) of Regulation S-X regarding the compliance date for SFAS 123(R) that amends the compliance dates and allows companies to implement SFAS 123(R) beginning with the first annual reporting period beginning on or after June 15, 2005. The Company intends to adopt SFAS 123(R) on January 1, 2006.
      We currently use the intrinsic value method to value stock options, and accordingly, no compensation expense has been recognized for stock options since we grant stock options with exercise prices equal to our common stock market price on the date of the grant. SFAS 123(R) requires the expensing of all stock-based compensation, including stock options and restricted shares, using the fair value method. We intend to expense stock options using the Modified Prospective Transition method as described in SFAS 123(R). This method will require expense to be recognized for stock options over their respective remaining vesting periods. No expense will be recognized for stock options vested in periods prior to the adoption of SFAS 123(R). We are evaluating the impact of the adoption of SFAS 123(R) on our results of operations and financial position. Adoption is not expected to have a material effect on our financial position or results of operations.
      The FASB issued Statement of Financial Accounting Standard No. 151, Inventory Costs — an amendment of ARB No. 43, Chapter 4 (“SFAS 151”). SFAS 151 is effective, and will be adopted, for inventory costs incurred during fiscal years beginning after June 15, 2005 and is to be applied prospectively. SFAS 151 amends the guidance in ARB No. 43, Chapter 4, Inventory Pricing, to require current period recognition of abnormal amounts of idle facility expense, freight, handling costs and wasted material (spoilage). Adoption is not expected to have a material effect on our financial position or results of operations.
      The FASB issued Statement of Financial Accounting Standard No. 153, Exchanges of Nonmonetary Assets — an amendment of APB Opinion No. 29 (“SFAS 153”). FAS 153 is effective, and will be adopted, for nonmonetary asset exchanges occurring in fiscal periods beginning after June 15, 2005 and is to be applied prospectively. SFAS 153 eliminates the exception for fair value treatment of nonmonetary exchanges of similar productive assets and replaces it with a general exception for exchanges of nonmonetary assets that do not have commercial substance. A nonmonetary exchange has commercial substance if the future cash flows of the entity are expected to change significantly as a result of the exchange. Adoption is not expected to have a material effect on our financial position or results of operations.
      The FASB issued Statement of Financial Accounting standards No. 154, Accounting changes and Error Corrections — a replacement of APB Opinion No. 20 and FASB Statement No. 3 (“SFAS 154”). SFAS 154 is effective, and will be adopted for accounting changes made in fiscal years beginning after December 15, 2005 and is to be applied retrospectively. SFAS 154 requires that retroactive application of a change in accounting principle be limited to the direct effects of the change. Adoption is not expected to have a material effect on the Company’s financial position or results of operations.
      Reclassifications — Certain reclassifications have been made to the 2004 and 2003 consolidated financial statements in order for them to conform with the 2005 presentation.

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
2. Embezzlement and Restatements
      On November 3, 2005, the Company announced the resignation of its CFO, Jonathan D. Nelson (“Nelson”). On November 10, 2005, the Company announced that, based on information received by Company senior management on November 9, 2005, the Audit Committee of the Company’s Board of Directors began an investigation into an apparent embezzlement from the Company by Nelson.
      On December 22, 2005, upon recommendation of Company management and the Audit Committee of its Board of Directors, the Company announced that based on the results to date of its internal investigation into the facts and circumstances surrounding the embezzlement by Nelson, the Company would restate previously issued financial statements and amend its previously issued Annual Report on Form 10-K for the year ended December 31, 2004 and Quarterly Reports on Form 10-Q for the periods ended March 31, June 30 and September 30, 2005. These restatements reflect losses incurred as a result of payments made to or for the benefit of Nelson that had been recognized in the Company’s accounting records and previously issued financial statements as payments for assets and services that were not received by the Company. Previously issued financial statements have also been restated for the effects of the correction of other errors that are immaterial both individually and in the aggregate. These other adjustments relate primarily to previously reported property and equipment balances that resulted from our review of our property and equipment records and the underlying physical assets in connection with investigation of the embezzlement. The Company has restated such financial statements, and on March 17, 2006, the Company filed its amended Annual Report on Form 10-K/A and on March 27, 2006, the Company filed its amended Quarterly Reports on Form 10-Q/A with the SEC.
      Most of the embezzled funds result from Nelson causing the wiring of Company funds aggregating approximately $72.3 million, to, or for the benefit of, entities owned and controlled by him. Nelson was originally able to initiate these wire transfers by requesting the wire transfers himself in telephone calls to one of the Company’s banks. After changes to the Company’s internal controls and procedures in 2004, Nelson initiated the wire transfers through instructions to one of his subordinates and by the creation of fraudulent invoices containing forged senior management approvals. This false documentation was created by our former CFO to conceal the true nature of these transactions from the Company and its independent registered public accountants.
      Nelson also instructed certain former employees, who worked under his supervision, to alter management reports related to property and equipment expenditures. Nelson also created fictitious property and equipment approval forms with forged signatures.
      The total amount embezzled was approximately $77.5 million in cash, excluding any tax effects, beginning with the year ended December 31, 1998 through November 3, 2005 as follows (in thousands):
             
From 1998 to December 31, 2004
  $ 58,961  
From January 1, 2005 to September 30, 2005(1)
    12,193  
       
 
Total through September 30, 2005
    71,154  
From October 1, 2005 to November 3, 2005 (net of $1,500 repayment)(1)
    6,350  
       
   
Total embezzlement
  $ 77,504  
       
 
(1)  The total amount embezzled during 2005 was $18,543,000 and the Company incurred $1,500,000 of professional fees and expenses as a result of the embezzlement. Accordingly, the total embezzled funds and related expenses in 2005 were $20,043,000.
      The Company promptly advised the United States Securities and Exchange Commission (“SEC”) when it became aware of the embezzlement. The SEC promptly obtained a freeze order on Nelson’s assets

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
(including assets held by entities controlled by him) and a Receiver was appointed to collect those assets. The United States attorney for the Northern District of Texas obtained an indictment against Nelson and investigation of this matter continues.
      The Company understands that the Receiver will ultimately liquidate the assets and propose a plan to distribute the proceeds. While the Company believes it has a claim for at least the full amount embezzled, other creditors have or may assert claims on the assets held by the Receiver. As a result, recovery by the Company from the Receiver is uncertain as to timing and amount, if any. Recoveries, if any, will be recognized when they are considered collectable.
      The financial statements and related financial and statistical data contained in this Report have been restated to provide for, net of related tax effects, (1) the effects of losses incurred as a result of the embezzlement and (2) the effects of the correction of other errors that are immaterial both individually and in the aggregate. The effects of the embezzlement and other adjustments on the company’s financial position follow:
                                     
    As of December 31,
     
        Effects of   Effects of    
    Previously   Adjustment for   Other    
    Reported   Embezzlement   Adjustments   Restated
                 
    (In thousands)
2004:
                               
 
Property and equipment:
                               
   
At cost
  $ 1,400,848     $ (55,211 )   $ (6,866 )   $ 1,338,771  
   
Accumulated depreciation
    (571,973 )     1,348       (3,127 )     (573,752 )
   
Net
    828,875       (53,863 )     (9,993 )     765,019  
 
Goodwill
    101,326       (2,270 )           99,056  
 
Total assets
    1,322,911       (56,133 )     (9,993 )     1,256,785  
 
Federal and state income taxes payable
    2,754       1,311       166       4,231  
 
Deferred tax liabilities, net
    162,040       (22,159 )     594       140,475  
 
Liabilities
    315,372       (20,848 )     760       295,284  
 
Retained earnings
    415,489       (35,285 )     (6,492 )     373,712  
 
Accumulated other comprehensive income
    11,611             (4,261 )     7,350  
 
Stockholders’ equity
    1,007,539       (35,285 )     (10,753 )     961,501  
2003:
                               
 
Federal and state income taxes receivable
  $ 12,667     $ (1,044 )   $ (170 )   $ 11,453  
 
Property and equipment:
                               
   
At cost
    1,161,536       (38,240 )     (4,992 )     1,118,304  
   
Accumulated depreciation
    (467,905 )     890       (891 )     (467,906 )
   
Net
    693,631       (37,350 )     (5,883 )     650,398  
 
Goodwill
    51,179       (146 )           51,033  
 
Total assets
    1,084,114       (38,540 )     (6,053 )     1,039,521  
 
Deferred tax liabilities, net
    143,309       (15,044 )     386       128,651  
 
Liabilities
    264,365       (15,044 )     386       249,707  
 
Retained earnings
    317,627       (23,496 )     (3,894 )     290,237  
 
Accumulated other comprehensive income
    6,934             (2,545 )     4,389  
 
Stockholders’ equity
    819,749       (23,496 )     (6,439 )     789,814  

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Table of Contents

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      The effects of the embezzlement and other adjustments on the Company’s results of operations and cash flows follow:
                                       
    Year Ended December 31,
     
        Effects of   Effects of    
    Previously   Adjustment for   Other    
    Reported   Embezzlement   Adjustments   Restated
                 
    (In thousands, except per share amounts)
2004:
                               
 
Depreciation, depletion, amortization and impairment
  $ 119,395     $ (461 )   $ 3,866     $ 122,800  
 
Selling, general and administrative
    32,007       (24 )           31,983  
 
Other (including gain or loss on sale of assets)
    1,655             (244 )     1,411  
 
Embezzled funds expense
          19,122             19,122  
 
Operating income
    171,214       (18,637 )     (4,110 )     148,467  
 
Income before income taxes
    171,894       (18,637 )     (4,110 )     149,147  
 
Income tax expense
    63,161       (6,848 )     (1,512 )     54,801  
 
Net income
    108,733       (11,789 )     (2,598 )     94,346  
   
Per common share:
                               
     
Basic
    0.65       (0.07 )     (0.02 )     0.57  
     
Diluted
    0.64       (0.07 )     (0.02 )     0.56  
 
Net cash provided by (used in):
                               
   
Operating activities
    222,289       (19,098 )           203,191  
   
Investing activities
    (222,537 )     19,098             (203,439 )
   
Acquisitions
    32,514       (2,127 )           30,387  
 
Purchases of property and equipment
    191,560       (16,971 )           174,589  

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
                                       
    Year Ended December 31,
     
        Effects of   Effects of    
    Previously   Adjustment for   Other    
    Reported   Embezzlement   Adjustments   Restated
                 
    (In thousands, except per share amounts)
2003:
                               
 
Depreciation, depletion, amortization and impairment
  $ 97,998     $ (450 )   $ 3,286     $ 100,834  
 
Selling, general and administrative
    27,709       (24 )           27,685  
 
Other (including gain or loss on sale of assets)
    4,626             (247 )     4,379  
 
Embezzled funds expense
          17,849             17,849  
 
Operating income
    87,190       (17,375 )     (3,533 )     66,282  
 
Income before income taxes and cumulative effect of change in accounting principle
    89,884       (17,375 )     (3,533 )     68,976  
 
Income tax expense
    32,996       (6,378 )     (1,298 )     25,320  
 
Income before cumulative effect of change in accounting principle
    56,888       (10,997 )     (2,235 )     43,656  
 
Net income
    56,419       (10,997 )     (2,235 )     43,187  
   
Per common share:
                               
     
Basic
    0.35       (0.07 )     (0.01 )     0.27  
     
Diluted
    0.34       (0.07 )     (0.01 )     0.26  
 
Net cash provided by (used in):
                               
   
Operating activities
    162,776       (17,825 )           144,951  
   
Investing activities
    (154,603 )     17,825             (136,778 )
 
Purchases of property and equipment
    116,626       (17,825 )           98,801  
3. Acquisitions
2005 Acquisitions
      Key Energy Services, Inc. — On January 15, 2005, the Company purchased land drilling assets from Key Energy Services, Inc. for $61.8 million. The assets included 25 active and 10 stacked land-based drilling rigs, related drilling equipment, yard facilities and a rig moving fleet consisting of approximately 45 trucks and 100 trailers. The transaction was accounted for as an acquisition of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
      Other — On June 17, 2005, the Company acquired one land-based drilling rig for $3.6 million and on September 29, 2005, the Company acquired five land-based drilling rigs and related drilling equipment for $8.2 million. The transactions were accounted for as acquisitions of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
2004 Acquisition
      TMBR/ Sharp Drilling, Inc. — On February 11, 2004, the Company completed its acquisition of TMBR, a Texas corporation, in which one of its wholly-owned subsidiaries acquired 100% of the remaining outstanding shares of TMBR. Operations of TMBR subsequent to February 11, 2004, are included in the Company’s consolidated financial statements. The transaction was accounted for as a business combination and the purchase price was allocated among the assets acquired and liabilities assumed based on their

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
estimated fair market values. The assets of TMBR included 18 land-based drilling rigs and related equipment, shop facilities, equipment yards and their oil and natural gas properties.
      The purchase price was calculated as follows (restated (See Note 2), in thousands, except per share data and exchange ratio):
           
Cash of $9.09 per share for the 4,447 TMBR shares outstanding at February 11, 2004, excluding the 1,059 TMBR shares owned by Patterson-UTI
  $ 40,423  
Patterson-UTI shares issued at $17.82 per share (4,447 TMBR shares X .624332 exchange ratio X $17.82)
    49,476  
1,059 TMBR shares previously acquired by the Company
    19,771  
Acquisition costs
    10,511  
Less: Cash acquired
    (7,909 )
       
 
Total purchase price
  $ 112,272  
       
      The purchase price was allocated among assets acquired and liabilities assumed based on their estimated fair market values as follows (restated (See Note 2), in thousands):
           
Current assets
  $ 7,181  
Fixed assets
    60,784  
Other long term assets
    172  
Deferred tax assets
    13,080  
Goodwill
    48,020  
Current liabilities
    (7,080 )
Other long term liabilities
    (1,090 )
Deferred tax liability
    (8,795 )
       
 
Total purchase allocation
  $ 112,272  
       
      The Company acquired TMBR to increase its productive asset base in the Permian Basin, which is one of the most active land drilling regions in the U.S. TMBR was well established in the contract drilling industry and maintained favorable customer relationships. Goodwill was recognized in the transaction as a result of these factors.
      The following represents pro-forma unaudited financial information as if the acquisition had been completed on January 1, 2003 (in thousands, except per share amounts):
                   
    Restated (See Note 2)
     
    2004   2003
         
Revenue
  $ 1,005,357     $ 818,774  
Income before cumulative effect of change in accounting principle
    94,047       45,430  
Net income
    94,047       44,961  
Earnings per share:
               
 
Basic
  $ 0.57     $ 0.28  
             
 
Diluted
  $ 0.56     $ 0.27  
             

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
2003 Acquisitions
      SEI Drilling Company — On January 31, 2003, the Company acquired four land-based drilling rigs and related equipment from SEI Drilling Company for $6.0 million in cash. The transaction was accounted for as an acquisition of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
      Mesa Drilling, Inc. — On February 7, 2003, the Company acquired three land-based drilling rigs, a yard and other related equipment from Mesa Drilling, Inc. and related entities for $10.5 million in cash. The transaction was accounted for as an acquisition of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
      Other — On April 28, 2003, the Company acquired two land-based drilling rigs for $3.9 million in cash. The transaction was accounted for as an acquisition of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
      Hexadyne Drilling Corporation — On May 30, 2003, the Company acquired seven land-based drilling rigs and related equipment from Hexadyne Drilling Corporation for $10.1 million in cash. The transaction was accounted for as an acquisition of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
      Fort Drilling LLC — On November 17, 2003, the Company acquired three land-based drilling rigs, a shop facility and related equipment from Fort Drilling LLC for $7.2 million in cash. The transaction was accounted for as an acquisition of assets and the purchase price was allocated among the assets acquired based on their estimated fair market values.
      Other — In addition to the above mentioned acquisitions, the Company spent approximately $3.1 million on other acquisitions of assets and costs associated with the acquisitions completed during 2003.
4. Comprehensive Income
      The following table illustrates the Company’s comprehensive income including the effects of foreign currency translation adjustments for the years ended December 31, 2005, 2004 and 2003 (in thousands):
                         
        Restated (See Note 2)
         
    2005   2004   2003
             
Net income
  $ 372,740     $ 94,346     $ 43,187  
Other comprehensive income:
                       
Foreign currency translation adjustment related to Canadian operations
    1,215       2,961       5,553  
                   
Comprehensive income
  $ 373,955     $ 97,307     $ 48,740  
                   

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
5. Property and Equipment
      Property and equipment consisted of the following at December 31, 2005 and 2004 (in thousands):
                 
        Restated
        (See Note 2)
    2005   2004
         
Equipment
  $ 1,633,911     $ 1,239,519  
Oil and natural gas properties
    79,079       82,711  
Buildings
    22,490       12,892  
Land
    5,611       3,649  
             
      1,741,091       1,338,771  
Less accumulated depreciation and depletion
    (687,246 )     (573,752 )
             
    $ 1,053,845     $ 765,019  
             
6. Goodwill
      Goodwill is evaluated to determine if the fair value of the asset has decreased below its carrying value. At December 31, 2005 the Company performed its annual goodwill evaluation and determined no adjustment to impair goodwill was necessary. Goodwill as of December 31, 2005 and 2004 are as follows (in thousands):
                         
        Restated
        (See Note 2)
    2005   2004
         
Drilling:
               
 
Goodwill at beginning of period
  $ 89,092     $ 41,069  
   
Goodwill in TMBR
          48,020  
   
Other
          3  
             
     
Goodwill at end of period
    89,092       89,092  
             
Drilling and completion fluids:
               
 
Goodwill at beginning of period
    9,964       9,964  
   
Changes to goodwill
           
             
     
Goodwill at end of period
    9,964       9,964  
             
       
Total goodwill
  $ 99,056     $ 99,056  
             
7. Investment in Equity Securities
      As a result of the Company increasing its ownership of TMBR from 19.5% to 100% in 2004, the Company’s consolidated financial statements for 2003 were previously restated to provide for the retroactive application of the equity method of accounting for the investment in TMBR.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      The following tables present the effects of all restatements for the year ended December 31, 2003 (in thousands, except per share amounts):
                                           
    Previously   Effects of            
    Reported   Adjustment   Effects of   Effects of    
    on Cost   to Equity   Adjustment for   Other    
    Basis   Method   Embezzlement   Adjustments   Restated
                     
Other income (loss)
  $ 143     $ 1,727     $     $     $ 1,870  
Deferred income tax expense
  $ 17,274     $ 634     $ (6,615 )   $ (1,297 )   $ 9,996  
Net income
  $ 55,326     $ 1,093     $ (10,997 )   $ (2,235 )   $ 43,187  
Comprehensive income, net of tax
  $ 65,689     $ (497 )   $ (10,997 )   $ (5,455 )   $ 48,740  
Net income per common share:
                                       
 
Basic
  $ 0.34     $ 0.01     $ (0.07 )   $ (0.01 )   $ 0.27  
 
Diluted
  $ 0.34     $ 0.01     $ (0.07 )   $ (0.01 )   $ 0.26  
8. Accrued Expenses
      Accrued expenses consisted of the following at December 31, 2005 and 2004 (in thousands):
                 
    2005   2004
         
Salaries, wages, payroll taxes and benefits
  $ 33,816     $ 21,245  
Workers’ compensation liability
    47,107       38,677  
Sales, use and other taxes
    9,484       5,863  
Insurance, other than workers’ compensation
    11,365       7,061  
Other
    10,704       6,317  
             
    $ 112,476     $ 79,163  
             
9. Asset Retirement Obligation
      Statement of Financial Accounting Standards No. 143, “Accounting for Asset Retirement Obligations,” (“SFAS 143”), requires that the Company record a liability for the estimated costs to be incurred in connection with the abandonment of oil and natural gas properties in the future. The following table describes the changes to the Company’s asset retirement obligations during 2005 and 2004 (in thousands):
                 
    2005   2004
         
Balance at beginning of year
  $ 2,358     $ 1,163  
Liabilities incurred*
    101       1,277  
Liabilities settled
    (808 )     (153 )
Accretion expense
    74       71  
             
Asset retirement obligation at end of year
  $ 1,725     $ 2,358  
             
 
The 2004 amount includes $1,091 of liabilities assumed in the acquisition of TMBR.
      As a result of the Company’s adoption of SFAS 143, a cumulative effect of change in accounting principle of approximately $469,000, net of tax, was recorded in the first quarter of 2003.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
10. Notes Payable
      The Company replaced its prior credit facility in December 2004 with a five-year, $200 million unsecured revolving line of credit (“LOC”). Interest is to be paid on outstanding LOC balances at a floating rate ranging from LIBOR plus 0.625% to 1.0% or the prime rate. This arrangement includes various fees, including a commitment fee on the average daily unused amount (0.15% at December 31, 2005). There are customary restrictions and covenants associated with the LOC. Financial covenants provide for a maximum debt to capitalization ratio and a minimum interest coverage ratio. The Company does not expect that the restrictions and covenants will restrict its ability to operate or react to opportunities that might arise. Availability under the LOC is reduced by outstanding letters of credit which totaled $56 million at December 31, 2005. There were no outstanding borrowings under the LOC at December 31, 2005. Costs of approximately $445,000 were expensed in 2004 to terminate the previous $100 million credit facility.
11. Commitments, Contingencies and Other Matters
      The Company maintains letters of credit in the aggregate amount of $56.0 million for the benefit of various insurance companies as collateral for retrospective premiums and retained losses which may become payable under the terms of the underlying insurance contracts. These letters of credit expire variously during each calendar year. No amounts have been drawn under the letters of credit.
      Contingencies — The Company’s contract services and oil and natural gas exploration and production operations are subject to inherent risks, including blowouts, cratering, fire and explosions which could result in personal injury or death, suspended drilling operations, damage to, or destruction of equipment, damage to producing formations and pollution or other environmental hazards.
      As a protection against these hazards, the Company maintains general liability insurance coverage of $2.0 million per occurrence with $4.0 million of aggregate coverage and excess liability and umbrella coverages up to $75.0 million per occurrence and in the aggregate. The Company maintains a $1.0 million per occurrence deductible on its workers’ compensation insurance and its general liability insurance coverages. These levels of self-insurance expose the Company to increased operating costs and risks.
      We have signed non-cancelable commitments to purchase $118 million of equipment to be received throughout 2006.
      Net income for the year ended December 31, 2005 includes a charge of $4.2 million related to the financial failure of a workers’ compensation insurance carrier that had provided coverage for the Company in prior years.
      The Company believes it is adequately insured for public liability and property damage to others with respect to its operations. However, such insurance may not be sufficient to protect the Company against liability for all consequences of well disasters, extensive fire damage, or damage to the environment. The Company also carries insurance to cover physical damage to, or loss of, its rigs; however, it does not carry insurance against loss of earnings resulting from such damage or loss.
      In December 2005, two purported derivative actions were filed in Texas state court in Scurry County, Texas, against the directors of the Company, alleging that the directors breached their fiduciary duties to the Company as a result of alleged failure to timely discover the embezzlement. The Board of Directors formed a special litigation committee to review and inquire about these allegations and recommend the Company’s response, if any. Further legal proceedings in these suits have been stayed pending completion of the work of the special litigation committee. The lawsuits seek recovery on behalf of and for the Company and do not seek recovery from the Company.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      The Company is party to various other legal proceedings arising in the normal course of its business. The Company does not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on its financial condition.
      Other Matters — Effective January 29, 2004, the Company entered into Change in Control Agreements with its Chairman of the Board, Chief Executive Officer, President, two Senior Vice Presidents and Nelson (the “Key Employees”). On November 3, 2005, Nelson resigned, which resulted in the expiration of his Change in Control Agreement. Each Change in Control Agreement generally has a three-year term with automatic twelve month renewals unless the Company notifies the Key Employee at least ninety days before the end of such renewal period that the term will not be extended. If a change in control of the Company occurs during the term of the agreement and the Key Employee’s employment is terminated (i) by the Company other than for cause or other than automatically as a result of death, disability or retirement or (ii) by the Key Employee for good reason (as those terms are defined in the Change in Control Agreements), then the Key Employee shall be entitled to, among other things,
  •  bonus payment equal to the greater of the highest bonus paid after the Change in Control Agreement was entered into and the average of the two annual bonuses earned in the two fiscal years immediately preceding a change in control (such bonus payment prorated for the portion of the fiscal year preceding the termination date);
 
  •  a payment equal to 2.5 times (in the case of the Chairman of the Board, Chief Executive Officer and President and Chief Operating Officer) or 1.5 times (in the case of the Senior Vice Presidents) of the sum of (i) the highest annual salary in effect for such Key Employee and (ii) the average of the three annual bonuses earned by the Key Employee for the three fiscal years preceding the termination date; and
 
  •  continued coverage under the Company’s welfare plans for up to three years (in the case of the Chairman of the Board, Chief Executive Officer and President and Chief Operating Officer) or two years (in the case of the Senior Vice Presidents).
      Each Change in Control Agreement provides the Key Employee with a full gross-up payment for any excise taxes imposed on payments and benefits received under the Change in Control Agreements or otherwise, including other taxes that may be imposed as a result of the gross-up payment.
12. Stockholders’ Equity
      During the second quarters of 2004 and 2005 and third quarter of 2005, the Company granted restricted shares of the Company’s common stock (the “Restricted Shares”) to certain key employees under the Patterson-UTI Energy, Inc. 1997 Long-Term Incentive Plan, as amended, and the 2005 Plan. As required by APB 25, the Restricted Shares were valued based upon the market price of the Company’s common stock on the date of the grant. The 2005 grants consisted of 305,000 restricted shares with a weighted average grant date fair value of $26.37 per share. The resulting value is being amortized over the vesting period of the stock. For the years ended December 31, 2005 and 2004, compensation expense of $1.8 million and $773,000, net of $327,000 and $5,000 of forfeitures and of $1.0 million and $449,000 of taxes, respectively, was included as a reduction in net income.
      On June 7, 2004, the Company’s Board of Directors authorized a stock buyback program for the purchase of up to $30 million of the Company’s outstanding common stock. During the second quarter of 2004, the Company purchased 100,000 shares of its common stock in the open market for approximately $1.5 million (adjusted to reflect the two-for-one stock split on June 30, 2004). During the fourth quarter of 2005, the Company purchased 355,000 shares of its common stock in the open market for approximately $12.2 million. These shares are included in treasury stock. On March 27, 2006, the Company’s Board of Directors increased the stock buyback program to allow the future purchases of up to $200 million of the Company’s outstanding common stock.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      On April 28, 2004, the Company’s Board of Directors authorized a two-for-one stock split in the form of a stock dividend which was distributed on June 30, 2004 to holders of record on June 14, 2004. In connection with the two-for-one stock split, an adjustment was made to reclassify an amount from retained earnings to common stock to account for the par value of the common stock issued as a stock dividend. This adjustment had no overall effect on equity. The prior year balance sheet was not restated as a result of this transaction; however, historical earnings per share amounts included in the Consolidated Statements of Income and elsewhere in this Report have been restated as if the two-for-one stock split had occurred on January 1, 2003.
      On April 28, 2004, the Company’s Board of Directors approved the initiation of a quarterly cash dividend of $0.02 on each share of its common stock which was paid on June 2, 2004. Quarterly dividends in the amount of $0.02 per share were also paid on September 1, 2004 and December 1, 2004. Total dividends paid in 2004 were approximately $10 million. In February 2005, the Company’s Board of Directors approved an increase in the quarterly cash dividend on the Company’s common stock to $0.04 per share from $0.02 per share. Quarterly cash dividends in the amount of $0.04 per share were paid on March 4, 2005, June 1, 2005, September 1, 2005 and December 1, 2005. Total cash dividends in 2005 were approximately $27.3 million. The next quarterly cash dividend is to be paid to holders of record on March 15, 2006 and paid on March 30, 2006. The amount and timing of all future dividend payments is subject to the discretion of the Board of Directors and will depend upon business conditions, results of operations, financial condition, terms of the Company’s credit facilities and other factors.
      In February 2004, the Company completed its acquisition of TMBR in which one of its wholly-owned subsidiaries acquired 100% of the remaining outstanding shares of TMBR for a net cash payment of $32.5 million ($40.4 million paid to TMBR shareholders less $7.9 million in cash acquired in the transaction) and the issuance of 2.78 million shares of the Company’s common stock valued at $17.82 per share (adjusted to reflect the two-for-one stock split on June 30, 2004). The assets of TMBR included 18 land-based drilling rigs and related equipment, shop facilities, equipment yards and their oil and natural gas properties. The transaction was accounted for as a business combination and the purchase price was allocated among the assets acquired and liabilities assumed based on their estimated fair market values (see Note 3).
13. Stock Options and Warrants
      Employee and Non-Employee Director Stock Option Plans — The Company has eight stock option plans of which one has shares available for grant. The remaining six plans are dormant and the Company does not

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
intend to grant any further options under such plans. At December 31, 2005, the Company’s stock option plans were as follows:
                         
    Options       Options
    Authorized   Options   Available
Plan Name   for Grant   Outstanding   for Grant
             
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (“2005 Plan”)(1)
    6,250,000             5,464,217  
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended (“1997 Plan”)
          5,010,603        
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (“2001 Plan”)
          888,304        
Amended and Restated Non-Employee Director Stock Option Plan of Patterson-UTI Energy, Inc. (“Non- Employee Director Plan”)
          200,000        
1997 Stock Option Plan of DSI Industries, Inc. (“DSI Plan”)
          536        
Amended and Restated Patterson-UTI Energy, Inc. 1996 Employee Stock Option Plan (“1996 Plan”)
          95,800        
Patterson-UTI Energy, Inc., 1993 Incentive Stock Plan, as amended (“1993 Plan”)
          142,800        
 
(1)  Plan is for the benefit of employees of the Company, including officers and directors of the Company.
      The Company’s active plan is the 2005 Plan. A summary of this plan is set forth below.
2005 Plan
  •  Administered by the Compensation Committee of the Board of Directors.
 
  •  All employees including officers and directors are eligible for awards.
 
  •  Vesting schedule is set by the Compensation Committee, however, typically awards vest over 4 years.
 
  •  The Compensation Committee sets the term of the award except that no option can have a term of longer than 10 years.
 
  •  The awards granted under the plan, unless otherwise stated in the grant thereof, do not vest upon a change of control as defined in the plan.
 
  •  All options granted under the plan are granted with an exercise price equal to or greater than the fair market value of the Company’s common stock at the time the option is granted.
 
  •  The plan provides for awards of incentive stock options, non-incentive stock options, tandem and freestanding stock appreciation rights, restricted stock awards, other stock unit awards, performance share awards, performance unit awards and dividend equivalents.
      1997 Plan — Options granted under the 1997 Plan vest over three or five years as dictated by the Compensation Committee. These options typically had terms of ten years. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant. Restricted Stock Awards granted under the 1997 Plan vest over four years.
      2001 Plan — Options granted under the 2001 Plan vest over five years as dictated by the Compensation Committee. These options had terms of ten years. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant. Restricted Stock Awards granted under the 2001 Plan vest over four years.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      Non-Employee Director Plan — Options granted under the Non-Employee Director Plan vest on the first anniversary of the option grant. Non-Employee Director Plan options have five year terms. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant.
      DSI Plan — Options granted under the DSI plan typically vested at a rate of 33% per year with ten year terms. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant.
      1996 Plan — Options granted under the 1996 plan vested over one, four and five years as dictated by the Compensation Committee. These options had terms of five and ten years as dictated by the Compensation Committee. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant.
      1993 Plan — Options granted under the 1993 Plan, typically had terms of 10 years and vested over five years in 20% increments beginning at the end of the first year. These options vest in the event of a change of control as defined in the plan. All options were granted with an exercise price equal to the fair market value of the Company’s common stock at the time of grant.
      A summary of the status of the Company’s stock options issued as of December 31, 2005, 2004 and 2003 and the changes during each of the years then ended are presented below (in thousands, except weighted average exercise price):
                                                   
    2005   2004   2003
             
    No. of   Weighted   No. of   Weighted   No. of   Weighted
    Shares of   Average   Shares of   Average   Shares of   Average
    Underlying   Exercise   Underlying   Exercise   Underlying   Exercise
    Options   Price   Options   Price   Options   Price
                         
Outstanding at beginning of year
    10,006     $ 12.24       12,276     $ 10.31       12,277     $ 8.81  
 
Granted
    675       24.63       640       19.19       1,830       16.24  
 
Exercised
    (4,044 )     10.75       (2,852 )     5.55       (1,736 )     5.92  
 
Surrendered/Expired
    (299 )     15.23       (58 )     8.76       (95 )     9.99  
                                     
Outstanding at end of year
    6,338     $ 14.37       10,006     $ 12.24       12,276     $ 10.31  
                                     
Exercisable at end of year
    4,809     $ 13.33       6,377     $ 11.68       5,972     $ 8.15  
                                     

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      The following table summarizes information about stock options outstanding at December 31, 2005:
                                         
    Options Outstanding   Options Exercisable
         
        Weighted        
        Average   Weighted       Weighted
        Remaining   Average       Average
    Number   Contracted   Exercise   Number   Exercise
Range of Exercise Prices   Outstanding   Life   Price   Exercisable   Prices
                     
$1.5625 to $ 2.50
    136,100       3.25     $ 2.24       136,100     $ 2.24  
$  2.51 to $ 5.00
    41,300       2.16     $ 4.94       41,300     $ 4.94  
$  5.01 to $ 7.50
    53,436       1.65     $ 7.36       53,436     $ 7.36  
$  7.51 to $10.00
    1,256,470       5.46     $ 8.01       879,170     $ 8.03  
$ 10.01 to $12.50
    42,500       2.05     $ 11.48       42,500     $ 11.48  
$ 12.51 to $15.00
    1,849,904       6.58     $ 13.43       1,680,771     $ 13.34  
$ 15.01 to $24.63
    2,958,333       7.68     $ 18.53       1,976,111     $ 16.81  
                               
      6,338,043       6.70     $ 14.37       4,809,388     $ 13.33  
                               
      Pro Forma Stock-Based Compensation Disclosure — Pro forma information in accordance with SFAS 123 regarding net income and earnings per share, as described in Note 1, has been determined as if the Company had accounted for its employee stock options under the fair value method as defined in that statement. The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option valuation model with the following weighted-average assumptions for grants in 1996 through 2005 respectively; dividend yield of 0.65% for all 2005 grants, 0.06% for all 2004 grants and 0.00% for all other grants; risk-free interest rates are different for each grant and range from 2.18% to 7.02%; the expected term ranges from 3 to 6 years; and a volatility of 38.68% for all 1996 grants, 35.97% for all 1997 grants, 51.08% for all 1998 grants, 61.97% for all 1999 grants, 67.71% for all 2000 grants, 68.33% for all 2001 grants, 63.02% for all 2002 grants, 44.04% for all 2003 grants, 36.84% for all 2004 grants and 26.95% for all 2005 grants. The effects of applying SFAS 123 in this pro forma disclosure are not indicative of future amounts. SFAS 123 does not apply to awards prior to 1996.
      Stock Purchase Warrants — In December 2001, the Company issued 650,000 warrants exercisable at $13.375 per share as partial consideration for the purchase of 17 drilling rigs and related equipment from Cleere Drilling Company. The warrants were fully exercisable at the date of issuance. All of the warrants were exercised in December 2004.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      Tabular Summary — The following table summarizes information regarding the Company’s stock options and warrants granted under the provisions of the aforementioned plans as well as stock options and warrants issued pursuant to transactions described above (in thousands, except weighted average exercise prices):
                   
        Weighted
        Average
    Shares   Exercise Price
         
Granted
               
 
2005
    675     $ 24.63  
 
2004
    640     $ 19.19  
 
2003
    1,830       16.24  
Exercised
               
 
2005
    4,044     $ 10.75  
 
2004
    3,502     $ 7.00  
 
2003
    1,941       6.46  
Surrendered
               
 
2005
    299     $ 15.23  
 
2004
    58     $ 8.76  
 
2003
    95       9.99  
Outstanding at Year End
               
 
2005
    6,338     $ 14.37  
 
2004
    10,006     $ 12.24  
 
2003
    12,926       10.47  
Exercisable at Year End
               
 
2005
    4,809     $ 13.33  
 
2004
    6,377     $ 11.68  
 
2003
    6,622       8.66  
14. Leases
      The Company incurred rent expense, consisting primarily of daily rental charges for the use of drilling equipment, of $10.5 million, $9.1 million and $8.6 million, for the years 2005, 2004 and 2003, respectively. The Company’s obligations under non-cancelable operating lease agreements are not material to the Company’s operations.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
15. Income Taxes
      Components of the income tax provision applicable for Federal, state and foreign income taxes are as follows (in thousands):
                           
        Restated (See Note 2)
         
    2005   2004   2003
             
Federal income tax expense (benefit):
                       
 
Current
  $ 174,635     $ 32,686     $ 14,073  
 
Deferred
    14,182       12,366       7,794  
                   
      188,817       45,052       21,867  
                   
State income tax expense (benefit):
                       
 
Current
    13,045       2,031       1,233  
 
Deferred
    1,431       1,555       (487 )
                   
      14,476       3,586       746  
                   
Foreign income tax expense (benefit):
                       
 
Current
    7,238       5,235       18  
 
Deferred
    1,488       928       2,689  
                   
      8,726       6,163       2,707  
                   
Total:
                       
 
Current
    194,918       39,952       15,324  
 
Deferred
    17,101       14,849       9,996  
                   
Total income tax expense
  $ 212,019     $ 54,801     $ 25,320  
                   
      The difference between the statutory Federal income tax rate and the effective income tax rate is summarized as follows:
                         
        Restated
        (See Note 2)
         
    2005   2004   2003
             
Statutory tax rate
    35.0 %     35.0 %     35.0 %
State income taxes
    1.8       1.6       1.5  
Permanent differences
    (0.6 )     0.4       0.8  
Other, net
    0.1       (0.3 )     (0.6 )
                   
Effective tax rate
    36.3 %     36.7 %     36.7 %
                   
      In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. The Company expects the deferred tax assets at December 31, 2005 to be realized as a result of the reversal during the carryforward period of existing taxable temporary differences giving rise to deferred tax liabilities and the generation of taxable income in the carryforward period; therefore, no valuation allowance is necessary.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes therein were as follows (in thousands):
                                                             
            Restated (See Note 2)
             
    December 31,   Net   December 31,   Net   December 31,   Net   January 1,
    2005   Change   2004   Change   2003   Change   2003
                             
Deferred tax assets:
                                                       
 
Current:
                                                       
   
Federal net operating loss carryforwards
  $ 1,870     $     $ 1,870     $ 1,870     $     $     $  
   
Workers’ compensation allowance
    19,461       4,584       14,877       1,545       13,332       6,159       7,173  
   
AMT credit
                      (602 )     602             602  
   
Other
    11,364       4,386       6,978       1,238       5,740       (1,775 )     7,515  
                                           
      32,695       8,970       23,725       4,051       19,674       4,384       15,290  
                                           
 
Non-current:
                                                       
   
Federal net operating loss carryforwards
    2,245       (1,870 )     4,115       4,115                    
   
AMT credit
    118             118       118                    
   
Federal benefit of foreign deferred tax liabilities
    8,196       1,488       6,708       933       5,775       2,019       3,756  
   
Federal benefit of state deferred tax liabilities
    4,232       717       3,515       421       3,094       1,275       1,819  
   
Embezzled funds expense
          (22,178 )     22,178       7,193       14,985       6,713       8,272  
   
Other
    937       174       763       763                    
                                           
      15,728       (21,669 )     37,397       13,543       23,854       10,007       13,847  
                                           
Total deferred tax assets
    48,423       (12,699 )     61,122       17,594       43,528       14,391       29,137  
                                           
Deferred tax liabilities:
                                                       
 
Current:
                                                       
   
Other
    (6,313 )     1,421       (7,734 )     (4,509 )     (3,225 )     (3,225 )      
                                           
 
Non-current:
                                                       
   
Property and equipment basis difference
    (179,725 )     (6,381 )     (173,344 )     (25,534 )     (147,810 )     (16,683 )     (131,127 )
   
Other
    (5,191 )     (663 )     (4,528 )     167       (4,695 )     (4,795 )     100  
                                           
      (184,916 )     (7,044 )     (177,872 )     (25,367 )     (152,505 )     (21,478 )     (131,027 )
                                           
Total deferred tax liabilities
    (191,229 )     (5,623 )     (185,606 )     (29,876 )     (155,730 )     (24,703 )     (131,027 )
                                           
Net deferred tax liability
  $ (142,806 )   $ (18,322 )   $ (124,484 )   $ (12,282 )   $ (112,202 )   $ (10,312 )   $ (101,890 )
                                           
      Management expects to deduct accumulated net embezzlement losses in the Company’s 2005 tax returns, which corresponds with the period in which the embezzlement was detected.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      Other deferred tax assets consist primarily of various allowance accounts and tax deferred expenses expected to generate future tax benefit of approximately $12 million. Other deferred tax liabilities consist primarily of receivables from insurance companies and tax deferred income not yet recognized for tax purposes.
      For tax purposes, the Company has available at December 31, 2005, Federal net operating loss carryforwards of approximately $11 million and $118,000 of alternative minimum tax credit carryforwards. These carryforwards are attributable to the acquisition of TMBR in February 2004.
      The net operating loss carryforwards, if unused, are scheduled to expire as follows: 2006 — $1 million, 2011 — $2 million, 2018 — $4 million and 2019 — $4 million. The alternative minimum tax credit may be carried forward indefinitely.
16. Employee Benefits
      The Company maintains a 401(k) plan for all eligible employees. The Company’s operating results include expenses of approximately $2.7 million in 2005, $2.2 million in 2004 and $1.5 million in 2003 for the Company’s discretionary contributions to the plan.
17. Business Segments
      The Company conducts its business through four distinct operating segments: contract drilling of oil and natural gas wells, pressure pumping services and drilling and completion fluids services to operators in the oil and natural gas industry, and the exploration, development, acquisition and production of oil and natural gas. Each of these segments represents a distinct type of business based upon the type and nature of services and products offered. These segments have separate management teams which report to the Company’s chief executive officer and have distinct and identifiable revenues and expenses.
      Contract Drilling — The Company markets its contract drilling services to major and independent oil and natural gas operators. As of December 31, 2005, the Company owned 403 drilling rigs, of which 156 of the drilling rigs were based in the Permian Basin region, 53 in South Texas, 42 in the Ark-La-Tex region and Mississippi, 88 in the Mid-Continent region, 46 in the Rocky Mountain region and 18 in Western Canada. The Company operated 307 of its drilling rigs in 2005.
      Pressure Pumping — The Company provides pressure pumping services primarily in the Appalachian Basin. Pressure pumping services consist primarily of well stimulation and cementing for the completion of new wells and remedial work on existing wells. Well stimulation involves processes inside a well designed to enhance the flow of oil, natural gas, or other desired substances from the well. Cementing is the process of inserting material between the hole and the pipe to center and stabilize the pipe in the hole.
      Drilling and Completion Fluids — The Company provides drilling fluids, completion fluids and related services to oil and natural gas operators offshore in the Gulf of Mexico and on land in Texas, Southeastern New Mexico, Oklahoma and the Gulf Coast region of Louisiana. Drilling and completion fluids are used by oil and natural gas operators during the drilling process to control pressure when drilling oil and natural gas wells. The drilling fluids operations were added by the Company during 1998 with its acquisition of two companies with operations in Texas, Southeastern New Mexico, Oklahoma and Colorado. The Company’s services were expanded to include completion fluids in October 2000 with the acquisition of the drilling and completion fluids division of Ambar, Inc., which had operations in the coastal areas of Texas, Louisiana and in the Gulf of Mexico.
      Oil and Natural Gas — The Company is engaged in the development, exploration, acquisition and production of oil and natural gas.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
      The following tables summarize selected financial information relating to the Company’s business segments (in thousands):
                             
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003
             
Revenues:
                       
 
Contract drilling(a)
  $ 1,488,485     $ 815,683     $ 640,788  
 
Pressure pumping
    93,144       66,654       46,083  
 
Drilling and completion fluids(b)
    122,309       90,858       69,286  
 
Oil and natural gas
    39,616       33,867       21,163  
                   
Total segment revenues
    1,743,554       1,007,062       777,320  
 
Elimination of intercompany revenues(a)(b)
    (3,099 )     (6,293 )     (1,150 )
                   
Total revenues
  $ 1,740,455     $ 1,000,769     $ 776,170  
                   
Income (loss) before income taxes:
                       
 
Contract drilling
  $ 572,562     $ 146,626     $ 72,814  
 
Pressure pumping
    21,664       16,747       10,442  
 
Drilling and completion fluids
    11,947       4,202       (1,920 )
 
Oil and natural gas
    13,405       10,764       7,784  
                   
      619,578       178,339       89,120  
 
Corporate and other
    (14,223 )     (10,750 )     (7,441 )
 
Other charges(c)
    (4,016 )           2,452  
 
Embezzled funds and related expenses(d)
    (20,043 )     (19,122 )     (17,849 )
 
Interest income
    3,551       1,140       1,116  
 
Interest expense
    (516 )     (695 )     (292 )
 
Other
    428       235       1,870  
                   
   
Income before income taxes
  $ 584,759     $ 149,147     $ 68,976  
                   
Identifiable assets:
                       
 
Contract drilling
  $ 1,421,779     $ 961,873     $ 766,039  
 
Pressure pumping
    72,536       49,145       35,066  
 
Drilling and completion fluids
    90,904       62,970       56,215  
 
Oil and natural gas
    60,785       62,984       37,111  
                   
      1,646,004       1,136,972       894,431  
 
Corporate and other(e)
    149,777       119,813       145,090  
                   
Total assets
  $ 1,795,781     $ 1,256,785     $ 1,039,521  
                   
Depreciation, depletion and impairment:
                       
 
Contract drilling(d)
  $ 131,740     $ 101,779     $ 87,255  
 
Pressure pumping
    7,094       5,112       3,774  
 
Drilling and completion fluids
    2,368       2,156       2,279  
 
Oil and natural gas
    14,456       13,309       7,082  
                   
      155,658       122,356       100,390  
 
Corporate and other
    735       444       444  
                   
Total depreciation, depletion and impairment
  $ 156,393     $ 122,800     $ 100,834  
                   

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
                           
    Years Ended December 31,
     
        Restated (See Note 2)
         
    2005   2004   2003
             
Capital expenditures:
                       
 
Contract drilling(d)
  $ 329,073     $ 140,945     $ 77,350  
 
Pressure pumping
    25,508       17,705       10,524  
 
Drilling and completion fluids
    3,042       1,488       912  
 
Oil and natural gas
    17,163       14,451       10,015  
 
Corporate and other
    5,308              
                   
Total capital expenditures
  $ 380,094     $ 174,589     $ 98,801  
                   
 
(a) Includes contract drilling intercompany revenues of approximately $2.8 million, $6.0 million and $1.1 million for the years ended December 31, 2005, 2004 and 2003, respectively.
 
(b) Includes drilling and completion fluids intercompany revenues of approximately $298,000, $301,000 and $56,000 for the years ended December 31, 2005, 2004 and 2003, respectively.
 
(c) Other charges relate to decisions of the executive management group regarding corporate strategy, credit risk, loss contingencies and restructuring activities. Due to the non-operating nature of these decisions, the related charges have been separately presented and excluded from the results of specific segments. These charges are primarily related to the contract drilling segment.
 
(d) The Company’s former CFO perpetrated an embezzlement over a period of more than five years. Embezzled funds expense includes adjustments to eliminate payments related to the embezzlement previously capitalized as property and equipment and goodwill acquired. The related depreciation and other amounts expensed have also been reversed from the Company’s accounting records (See Note 2).
 
(e) Corporate assets primarily include cash on hand managed by the parent corporation and certain deferred Federal income tax assets.
18. Quarterly Financial Information (unaudited)
      On December 22, 2005, upon recommendation of Company management and the Audit Committee of its Board of Directors, the Company announced that based on the results to date of its internal investigation into the facts and circumstances surrounding the embezzlement by Nelson, the Company would restate previously issued financial statements and amend its previously issued Annual Report on Form 10-K for the year ended December 31, 2004 and Quarterly Reports on Form 10-Q for the periods ended March 31, June 30 and September 30, 2005. These restatements reflect losses incurred as a result of payments made to or for the benefit of Nelson that had been recognized in the Company’s accounting records and previously issued financial statements as payments for assets and services that were not received by the Company. Previously issued financial statements have also been restated for the effects of the correction of other errors that are immaterial both individually and in the aggregate. These other adjustments relate primarily to previously reported property and equipment balances that resulted from our review of our property and equipment records and the underlying physical assets in connection with investigation of the embezzlement. The Company has restated such financial statements, and on March 17, 2006, the Company filed its amended Annual Report on Form 10-K/A and on March 27, 2006, the Company filed its amended Quarterly Reports on Form 10-Q/A with the SEC. Quarterly financial information and the

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
related effects of the restatement due to the embezzlement and other adjustments for the years ended December 31, 2005 and 2004 is as follows (in thousands, except per share amounts):
                                     
    Restated (See Note 2)    
         
    1st   2nd   3rd   4th
    Quarter   Quarter   Quarter   Quarter
                 
2005
                               
Operating revenues
  $ 350,593     $ 389,922     $ 468,739     $ 531,201  
Operating income:
                               
 
As previously reported
  $ 94,252     $ 122,416     $ 173,511     $  
 
Adjustment for effects of embezzlement
    (1,381 )     (4,717 )     (4,721 )      
 
Other adjustments
    (1,038 )     (1,048 )     (1,344 )      
                         
      $ 91,833     $ 116,651     $ 167,446     $ 205,366  
                         
Net income:
                               
 
As previously reported
  $ 59,748     $ 77,665     $ 110,135     $  
 
Adjustment for effects of embezzlement
    (872 )     (2,978 )     (2,981 )      
 
Other adjustments
    (656 )     (661 )     (849 )      
                         
      $ 58,220     $ 74,026     $ 106,305     $ 134,189  
                         
Earnings per share:
                               
 
Basic:
                               
   
As previously reported
  $ 0.35     $ 0.46     $ 0.64     $  
   
Adjustment for effects of embezzlement
  $ (0.01 )   $ (0.02 )   $ (0.02 )   $  
   
Other adjustments
  $     $     $     $  
        $ 0.34     $ 0.44     $ 0.62     $ 0.78  
 
Diluted:
                               
   
As previously reported
  $ 0.35     $ 0.45     $ 0.63     $  
   
Adjustment for effects of embezzlement
  $ (0.01 )   $ (0.02 )   $ (0.02 )   $  
   
Other adjustments
  $     $     $     $  
        $ 0.34     $ 0.43     $ 0.61     $ 0.77  
                                   
    Restated (See Note 2)
     
    1st   2nd   3rd   4th
    Quarter   Quarter   Quarter   Quarter
                 
2004
                               
Operating revenues
  $ 218,779     $ 234,510     $ 259,174     $ 288,306  
Operating income:
                               
 
As previously reported
  $ 32,510     $ 30,799     $ 47,408     $ 60,497  
 
Adjustment for effects of embezzlement
    (5,013 )     (3,470 )     (4,642 )     (5,512 )
 
Other adjustments
    (927 )     (1,002 )     (1,024 )     (1,157 )
                         
      $ 26,570     $ 26,327     $ 41,742     $ 53,828  
                         

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
                                     
    Restated (See Note 2)
     
    1st   2nd   3rd   4th
    Quarter   Quarter   Quarter   Quarter
                 
Net income:
                               
 
As previously reported
  $ 20,682     $ 19,607     $ 29,964     $ 38,480  
 
Adjustment for effects of embezzlement
    (3,164 )     (2,186 )     (2,921 )     (3,518 )
 
Other adjustments
    (585 )     (631 )     (645 )     (737 )
                         
      $ 16,933     $ 16,790     $ 26,398     $ 34,225  
                         
Earnings per share:
                               
 
Basic:
                               
   
As previously reported
  $ 0.12     $ 0.12     $ 0.18     $ 0.23  
   
Adjustment for effects of embezzlement
  $ (0.02 )   $ (0.01 )   $ (0.02 )   $ (0.02 )
   
Other adjustments
  $     $     $     $  
        $ 0.10     $ 0.10     $ 0.16     $ 0.20  
 
Diluted:
                               
   
As previously reported
  $ 0.12     $ 0.12     $ 0.18     $ 0.23  
   
Adjustment for effects of embezzlement
  $ (0.02 )   $ (0.01 )   $ (0.02 )   $ (0.02 )
   
Other adjustments
  $     $     $     $  
        $ 0.10     $ 0.10     $ 0.16     $ 0.20  
19. Concentrations of Credit Risk
      Financial instruments, which potentially subject the Company to concentrations of credit risk, consist primarily of demand deposits, temporary cash investments and trade receivables.
      The Company believes that it places its demand deposits and temporary cash investments with high credit quality financial institutions. At December 31, 2005 and 2004, the Company’s demand deposits and temporary cash investments consisted of the following (in thousands):
                 
    2005   2004
         
Deposits in FDIC and SIPC-insured institutions under $100,000
  $ 1,066     $ 2,023  
Deposits in FDIC and SIPC-insured institutions over $100,000
    153,261       131,427  
Deposits in Foreign Banks
    2,513        
             
      156,840       133,450  
Less outstanding checks and other reconciling items
    (20,442 )     (21,079 )
             
Cash and cash equivalents
  $ 136,398     $ 112,371  
             
      Concentrations of credit risk with respect to trade receivables are primarily focused on companies involved in the exploration and development of oil and natural gas properties. The concentration is somewhat mitigated by the diversification of customers for which the Company provides drilling services. As is general industry practice, the Company generally does not require customers to provide collateral. No significant losses from individual contracts were experienced during the years ended December 31, 2005, 2004, or 2003. The Company recognized bad debt expense for 2005, 2004 and 2003 of $1.2 million, $897,000 and $259,000, respectively.
      The carrying values of cash and cash equivalents, marketable securities and trade receivables approximate fair value due to the short-term maturity of these assets.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)
20. Related Party Transactions
      Joint Operation of Oil and Natural Gas Properties — The Company operates certain oil and natural gas properties in which certain of its affiliated persons have participated, either individually or through entities they control, in the prospects or properties in which the Company has an interest. These participations, which have been on a working interest basis, have been in prospects or properties originated or acquired by Patterson-UTI. At December 31, 2005, affiliated persons were working interest owners in 254 of 305 total wells operated by Patterson-UTI. Sales were made by Patterson-UTI at its cost, comprised of Patterson-UTI’s costs of acquiring and preparing the working interests for sale. These costs were paid by the working interest owners on a pro rata basis based upon their working interest ownership percentage. The price at which working interests were sold to affiliated persons was the same price at which working interests were sold to unaffiliated persons. The affiliated persons earned oil and natural gas production revenue (net of royalty) of $15.5 million, $13.8 million and $11.1 million from these properties in 2005, 2004 and 2003, respectively. These persons or entities in turn paid for joint operating costs (including drilling and other development expenses) of $9.5 million, $7.5 million and $7.9 million incurred in 2005, 2004 and 2003, respectively. These activities resulted in a payable to the affiliated persons of approximately $1.5 million and $1.2 million and a receivable from the affiliated persons of approximately $1.2 million and $856,000 at December 31, 2005 and 2004, respectively.
      Other — In 2005, 2004 and 2003, the Company paid approximately $424,000, $914,000 and $740,000, respectively, to TMP Truck and Trailer LP (“TMP”), during the period it was owned by Thomas M. Patterson (son of A. Glenn Patterson), for certain equipment and metal fabrication services. Purchases from TMP were at current market prices.
      In 2005 and 2004, the Company paid approximately $273,000 and $39,000, respectively, to Melco Services (“Melco”) for dirt contracting services and $59,000 and $44,000, respectively, to L&N Transportation (“L&N”) for water hauling services. Both entities are owned by Lance D. Nelson, brother of Jonathan D. Nelson, Patterson-UTI’s former CFO. Purchases from Melco and L&N were at current market prices.
      See Note 2 for information pertaining to fraudulent payments made to or for the benefit of Jonathan D. Nelson, our former CFO.

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PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
                                   
        Charged to        
    Beginning   Costs and       Ending
Description   Balance   Expenses(1)   Deductions(2)   Balance
                 
    (In thousands)
Year Ended December 31, 2005
                               
Deducted from asset accounts:
                               
 
Allowance for doubtful accounts
  $ 1,909     $ 1,231     $ 941     $ 2,199  
Year Ended December 31, 2004
                               
Deducted from asset accounts:
                               
 
Allowance for doubtful accounts
  $ 2,133     $ 897     $ 1,121     $ 1,909  
Year Ended December 31, 2003
                               
Deducted from asset accounts:
                               
 
Allowance for doubtful accounts
  $ 3,144     $ 259     $ 1,270     $ 2,133  
 
(1)  Net of recoveries.
 
(2)  Uncollectible accounts written off.

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SIGNATURES
      Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Patterson-UTI Energy, Inc. has duly caused this Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.
  PATTERSON-UTI ENERGY, INC.
  By:  /s/ CLOYCE A. TALBOTT
 
 
  Cloyce A. Talbott
  Chief Executive Officer
Date: March 30, 2006
      Pursuant to the requirements of the Securities Exchange Act of 1934, this Report on Form 10-K has been signed by the following persons on behalf of Patterson-UTI Energy, Inc. and in the capacities indicated as of March 30, 2006.
         
Signature   Title
     
 
/s/ MARK S. SIEGEL

Mark S. Siegel
  Chairman of the Board
 
/s/ CLOYCE A. TALBOTT

Cloyce A. Talbott
(Principal Executive Officer)
  Chief Executive Officer and Director
 
/s/ A. GLENN PATTERSON

A. Glenn Patterson
  President, Chief Operating Officer and Director
 
/s/ KENNETH N. BERNS

Kenneth N. Berns
  Senior Vice President and Director
 
/s/ JOHN E. VOLLMER III

John E. Vollmer III
(Principal Financial and Accounting Officer)
  Senior Vice President — Corporate Development,
Chief Financial Officer, Secretary and Treasurer
 
/s/ ROBERT C. GIST

Robert C. Gist
  Director
 
/s/ CURTIS W. HUFF

Curtis W. Huff
  Director
 
/s/ TERRY H. HUNT

Terry H. Hunt
  Director
 
/s/ KENNETH R. PEAK

Kenneth R. Peak
  Director
 
/s/ NADINE C. SMITH

Nadine C. Smith
  Director


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EXHIBIT INDEX
         
  3 .1   Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
  3 .2   Amendment to Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).
  3 .3   Amended and Restated Bylaws (filed March 19, 2002 as Exhibit 3.2 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
  4 .1   Rights Agreement dated January 2, 1997, between Patterson Energy, Inc. and Continental Stock Transfer & Trust Company (filed January 14, 1997 as Exhibit 2 to the Company’s Registration Statement on Form 8-A and incorporated herein by reference).
  4 .2   Amendment to Rights Agreement dated as of October 23, 2001 (filed October 31, 2001 as Exhibit 3.4 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2001 and incorporated herein by reference).
  4 .3   Restated Certificate of Incorporation, as amended (See Exhibits 3.1 and 3.2).
  4 .4   Registration Rights Agreement with Bear, Stearns and Co. Inc., dated March 25, 1994, as assigned by REMY Capital Partners III, L.P.(filed March 19, 2002 as Exhibit 4.3 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
  10 .1   For additional material contracts, see Exhibits 4.1, 4.2 and 4.4.
  10 .2   Patterson-UTI Energy, Inc., 1993 Stock Incentive Plan, as amended (filed March 13, 1998 as Exhibit 10.1 to the Company’s Registration Statement on Form S-8 (File No. 333-47917) and incorporated herein by reference).*
  10 .3   Patterson-UTI Energy, Inc. Non-Employee Directors’ Stock Option Plan, as amended (filed November 4, 1997 as Exhibit 10.1 to the Company’s Registration Statement on Form S-8 (File No. 333-39471) and incorporated herein by reference).*
  10 .4   Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (filed November 27, 2002 as Exhibit 4.4 to Post Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8 (File No. 333-60470) and incorporated herein by reference).*
  10 .5   Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed July 28, 2003 as Exhibit 4.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 and incorporated herein by reference).*
  10 .6   Amendment to the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed August 9, 2004 as Exhibit 10.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .7   Amended and Restated Patterson-UTI Energy, Inc. Non-Employee Director Stock Option Plan(filed July 28, 2003 as Exhibit 4.8 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003 and incorporated herein by reference).*
  10 .8   Amended and Restated Patterson-UTI Energy, Inc. 1996 Employee Stock Option Plan (filed July 25, 2001 as Exhibit 4.4 to Post-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8 (File No. 333-60466) and incorporated herein by reference).*
  10 .9   1997 Stock Option Plan of DSI Industries, Inc. (filed July 25, 2001 as Exhibit 4.4 to Post-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8 (File No. 333-60470) and incorporated herein by reference).*
  10 .10   Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, including Form of Executive Officer Restricted Stock Award Agreement, Form of Executive Officer Stock Option Agreement, Form of Non-Employee Director Restricted Stock Award Agreement and Form of Non-Employee Director Stock Option Agreement (filed June 15, 2005 as Exhibit 10.1 to the Company’s Current Report on Form 8-K, and incorporated herein by reference).*
  10 .11   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed August 9, 2004 as Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*


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  10 .12   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and Cloyce A. Talbott (filed August 9, 2004 as Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .13   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and A. Glenn Patterson (filed August 9, 2004 as Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .14   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed August 9, 2004 as Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .15   Restricted Stock Award Agreement dated April 28, 2004 between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed August 9, 2004 as Exhibit 10.6 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by reference).*
  10 .16   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed on February 4, 2004 as Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .17   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and A. Glenn Patterson (filed on February 4, 2004 as Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .18   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Cloyce A. Talbott (filed on February 4, 2004 as Exhibit 10.4 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .19   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed on February 4, 2004 as Exhibit 10.5 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .20   Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed on February 4, 2004 as Exhibit 10.7 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .21   Form of Letter Agreement regarding termination, effective as of January 29, 2004, entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Kenneth N. Berns and John E. Vollmer III (filed on February 25, 2005 as Exhibit 10.23 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).*
  10 .22   Form of Indemnification Agreement entered into by Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Cloyce A. Talbott, A. Glenn Patterson, Kenneth N. Berns, Robert C. Gist, Curtis W. Huff, Terry H. Hunt, Kenneth R. Peak, Nadine C. Smith and John E. Vollmer III (filed April 28, 2004 as Exhibit 10.11 to the Company’s Annual Report on Form 10-K, as amended, for the year ended December 31, 2003 and incorporated herein by reference).*
  10 .23   Credit Agreement dated as of December 17, 2004 among Patterson-UTI Energy, Inc., as the Borrower, Bank of America, N.A., as administrative agent, L/ C Issuer and a Lender and the other lenders and agents party thereto (filed on December 23, 2004 as Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
  10 .24   Summary Description of 2005 Bonus Compensation Program (filed on April 29, 2005 in the Company’s Current Report on Form 8-K and incorporated herein by reference).*
  10 .25   Summary Description of Director Compensation (filed on February 25, 2005 as Exhibit 10.27 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 and incorporated herein by reference).*
  14 .1   Patterson-UTI Energy, Inc. Code of Business Conduct and Ethics for Senior Financial Executives (filed on February 4, 2004 as Exhibit 14.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).
  21 .1   Subsidiaries of the Registrant.
  23 .1   Consent of Independent Registered Public Accounting Firm.


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  31 .1   Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.
  31 .2   Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended.
  32 .1   Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 USC Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
 
Management Contract or Compensatory Plan identified as required by Item 15(a)(3) of Form 10-K.