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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
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 q/4MQoJJhdMLuG+0mbfd/w==

<SEC-DOCUMENT>0001209191-07-007342.txt : 20070202
<SEC-HEADER>0001209191-07-007342.hdr.sgml : 20070202
<ACCEPTANCE-DATETIME>20070202210416
ACCESSION NUMBER:		0001209191-07-007342
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070131
FILED AS OF DATE:		20070202
DATE AS OF CHANGE:		20070202

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PRIMEENERGY CORP
		CENTRAL INDEX KEY:			0000056868
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				840637348
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE LANDMARK SQ
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06901
		BUSINESS PHONE:		2033585700

	MAIL ADDRESS:	
		STREET 1:		ONE LANDMARK SQ
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06901

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KRM PETROLEUM CORP
		DATE OF NAME CHANGE:	19900614

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MCJUNKIN CORP
		CENTRAL INDEX KEY:			0001016497
		STATE OF INCORPORATION:			WV
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-07406
		FILM NUMBER:		07578187

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 513
		CITY:			CHARLESTON
		STATE:			WV
		ZIP:			25322
		BUSINESS PHONE:		3043481804

	MAIL ADDRESS:	
		STREET 1:		PO BOX 513
		CITY:			CHARLESTON
		STATE:			WV
		ZIP:			25322
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>bny29914_mcj4.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-01-31</periodOfReport>

    <issuer>
        <issuerCik>0000056868</issuerCik>
        <issuerName>PRIMEENERGY CORP</issuerName>
        <issuerTradingSymbol>PNRG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001016497</rptOwnerCik>
            <rptOwnerName>MCJUNKIN CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>835 HILLCREST DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHARLESTON</rptOwnerCity>
            <rptOwnerState>WV</rptOwnerState>
            <rptOwnerZipCode>25311</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Obligations to pay sale proceeds</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-01-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>592345</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $0.10 par value</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>592345</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person owns 623,521 shares of Common Stock, par value $0.10 per share of Prime Energy Corporation (the &quot;Shares&quot;).  Pursuant to the Merger Agreement, dated as of December 4, 2006 among the reporting person, McJ Holding Corporation and Hg Acquisition Corp., as amended (the &quot;Merger Agreement&quot;), upon a sale of Shares by the reporting person from and after January 31, 2007, the reporting person has an obligation to remit to those persons who were the record holders of shares of the reporting person immediately prior to the effective time of the Merger (as defined in the Merger Agreement) an amount equal to 95% of the after tax proceeds from such sale. The reporting person disclaims beneficial ownership of the securities reported herein, except to the extent of its pecuniary interest therein, if any.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>McJunkin Corporation By: /s/ James F. Underhill, Chief Financial Officer</signatureName>
        <signatureDate>2007-02-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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