Ownership Submission
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 *
  Riverstone/Carlyle Energy Partners IV, L.P.
 2. Date of Event Requiring Statement (Month/Day/Year)
04/17/2012		 3. Issuer Name and Ticker or Trading Symbol
SANDRIDGE ENERGY INC [SD]
(Last)
(First)
(Middle)
712 FIFTH AVENUE, 51ST FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10019		 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 51,370,888
I
See Footnotes (1) (2)

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
Riverstone/Carlyle Energy Partners IV, L.P.
712 FIFTH AVENUE, 51ST FLOOR
NEW YORK, NY 10019		     X    
R/C Energy GP IV, LLC
712 FIFTH AVENUE, 51ST FLOOR
NEW YORK, NY 10019		     X    

Signatures

/s/ Tom Walker, Managing Director of R/C Energy GP IV, LLC, the general partner of the reporting person 04/19/2012
**Signature of Reporting Person Date
/s/ Tom Walker, Managing Director of the reporting person 04/19/2012
**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 is filed jointly by R/C Energy GP IV, LLC ("Ultimate GP"), the general partner of Riverstone/Carlyle Energy Partners IV, L.P. ("GP").
(2) These securities are directly held by R/C Dynamic Holdings, L.P. ("R/C"). GP is the general partner of R/C. GP and Ultimate GP may be deemed to have indirect ownership of these securities through R/C. R/C has filed a separate Form 3 with respect to these securities.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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