FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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 *   SCF IV LP 2. Date of Event Requiring Statement (Month/Day/Year) 04/20/2006 3. Issuer Name and Ticker or Trading Symbol Complete Production Services, Inc. [CPX] (Last) (First) (Middle) 600 TRAVIS, SUITE 6600 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) __X__ Other (specify below) Member of a group 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) HOUSTON, TX 77002 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 39,396,756 D (1) Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SCF IV LP 600 TRAVIS SUITE 6600 HOUSTON, TX 77002	Â	  X	Â	Member of a group
SIMMONS L E 600 TRAVIS SUITE 6600 HOUSTON, TX 77002	Â	  X	Â	Member of a group
SCF IV GP LTD PARTNERSHIP 600 TRAVIS SUITE 6600 HOUSTON, TX 77002	Â	  X	Â	Member of a group
SIMMONS L E & ASSOCIATES INC 600 TRAVIS SUITE 6600 HOUSTON, TX 77002	Â	  X	Â	Member of a group

Signatures

By: SCF-IV, L.P., By: SCF-IV, G.P., L.P., its general partner, By: L.E. Simmons & Associates Incorporated, its general partner, By: L.E. Simmons, its sole stockholder and director /s/ Anthony DeLuca (attorney-in-fact) for L.E. Simmons		04/20/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	This Form 3 is being filed by more than one reporting person. SCF-IV, L.P., a Delaware limited partnership ("SCF-IV"), directly owns the shares of the common stock of the Issuer. SCF-IV, G.P., Limited Partnership, a Delaware limited partnership ("SCF-IV GP") is the sole general partner of SCF-IV. L.E. Simmons & Associates, Incorporated, a Delaware corporation ("Simmons & Associates"), is the sole general partner of SCF-IV GP. L.E. Simmons is the sole stockholder and director of Simmons & Associates. SCF-IV GP, Simmons & Associates, and L.E. Simmons are indirect beneficial owners of the reported securities.

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