Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SIEGEL MARK S
   2. Issuer Name and Ticker or Trading Symbol
PATTERSON UTI ENERGY INC [PTEN] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chairman of the Board
(Last)
(First)
(Middle)
1801 CENTURY PARK EAST, SUITE 1111		 3. Date of Earliest Transaction (Month/Day/Year)
08/01/2005
(Street)

LOS ANGELES, CA 90067		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, $.01 par value per share (1) 08/01/2005   M   47,600 A $ 7.925 347,600 D  
Common Stock, $.01 par value per share (1) 08/01/2005   M   191,000 A $ 13.195 538,600 D  
Common Stock, $.01 par value per share 08/01/2005   S   238,600 D $ 32.815 (2) 300,000 D  
Common Stock, $.01 par value per share 08/01/2005   S   659,600 (3) D $ 32.815 (2) 2,628,748 I See footnote (3)
Common Stock, $.01 par value per share (1) 08/02/2005   M   195,100 A $ 13.195 495,100 D  
Common Stock, $.01 par value per share 08/02/2005   S   195,100 D $ 32.9711 (4) 300,000 D  
Common Stock, $.01 par value per share 08/02/2005   S   539,700 (3) D $ 32.9711 (4) 2,089,048 I See footnote (3)
Common Stock, $.01 par value per share (1) 08/03/2005   M   38,000 A $ 13.195 338,000 D  
Common Stock, $.01 par value per share 08/03/2005   S   198,000 D $ 33.1915 (5) 140,000 D  
Common Stock, $.01 par value per share 08/03/2005   S   547,500 (3) D $ 33.1915 (5) 1,541,548 I See footnote (3)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (Right to Buy) $ 7.925 08/01/2005   M     47,600 07/20/2005(6) 07/19/2011 Common Stock 47,600 $ 0 100,000 D  
Stock Options (Right to Buy) $ 13.195 08/01/2005   M     191,000 01/18/2004(6) 07/17/2012 Common Stock 191,000 $ 0 409,000 D  
Stock Options (Right to Buy) $ 13.195 08/02/2005   M     195,100 10/18/2004(6) 07/17/2012 Common Stock 195,100 $ 0 213,900 D  
Stock Options (Right to Buy) $ 13.195 08/03/2005   M     38,000 12/18/2004(6) 07/17/2012 Common Stock 38,000 $ 0 175,900 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SIEGEL MARK S
1801 CENTURY PARK EAST
SUITE 1111
LOS ANGELES, CA 90067		   X     Chairman of the Board  

Signatures

 * Signed by Jonathan D. Nelson pursuant to a Limited Power of Attorney filed with the SEC on 4/30/2004 /s/ Jonathan D. Nelson   08/03/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Acquired upon exercise of option.
(2) Weighted average price: Actual sales prices ranged from $32.79 to $32.882.
(3) Shares owned by Remy Capital Partners III, L.P. Mr. Siegel is the sole stockholder of the general partner of Remy Capital Partners III, L.P.
(4) Weighted average price: Actual sales prices ranged from $32.84 to $33.14.
(5) Weighted average price: Actual sales prices ranged from $33.09 to $33.36.
(6) Currently vested.

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