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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HgxKBFEA1WMgTWQCEyefLhXfui2mm9pmBj8pZoIao6cz9FsmXuRX20wXjlPkQp03
 PmQOQkd6OcE6lujqNzjU3g==

<SEC-DOCUMENT>0001209191-10-049907.txt : 20101012
<SEC-HEADER>0001209191-10-049907.hdr.sgml : 20101011
<ACCEPTANCE-DATETIME>20101012062043
ACCESSION NUMBER:		0001209191-10-049907
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20101001
FILED AS OF DATE:		20101012
DATE AS OF CHANGE:		20101012

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KEY ENERGY SERVICES INC
		CENTRAL INDEX KEY:			0000318996
		STANDARD INDUSTRIAL CLASSIFICATION:	DRILLING OIL & GAS WELLS [1381]
		IRS NUMBER:				042648081
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1301 MCKINNEY STREET
		STREET 2:		SUITE 1800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77010
		BUSINESS PHONE:		713-651-4300

	MAIL ADDRESS:	
		STREET 1:		1301 MCKINNEY STREET
		STREET 2:		SUITE 1800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77010

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KEY ENERGY GROUP INC
		DATE OF NAME CHANGE:	19950217

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NATIONAL ENVIRONMENTAL GROUP INC
		DATE OF NAME CHANGE:	19921228

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	YANKEE COMPANIES INC
		DATE OF NAME CHANGE:	19891012

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ARCLIGHT ENERGY PARTNERS FUND III L P
		CENTRAL INDEX KEY:			0001353781

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08038
		FILM NUMBER:		101117251

	BUSINESS ADDRESS:	
		STREET 1:		200 CLARENDON ST 55TH FL
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02117
		BUSINESS PHONE:		617-531-6300

	MAIL ADDRESS:	
		STREET 1:		200 CLARENDON ST 55TH FL
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02117
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>c06717_3x0.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2010-10-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000318996</issuerCik>
        <issuerName>KEY ENERGY SERVICES INC</issuerName>
        <issuerTradingSymbol>KEG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001353781</rptOwnerCik>
            <rptOwnerName>ARCLIGHT ENERGY PARTNERS FUND III L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET, 55TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02117</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15807233</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote (1)</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The reporting person may be deemed a member of a group beneficially owning 10% or more of the common stock of the issuer within the meaning of Section 13(d) of the Securities Exchange Act of 1934. The reporting person disclaims beneficial ownership of all securities of the issuer except for shares held by OFS Energy Services, LLC, for which the reporting person is the owner of 100% of the membership interests of OFS Holdings Finance, LLC, which acts as controlling owner of the membership interests of OFS Holdings, LLC, the controlling owner of the membership interests of OFS Energy Services, LLC, and this report shall not be deemed an admission that such a group exists or that the reporting person is the beneficial owner of the securities of such group for purposes of Section 16 or for any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>ArcLight Energy Partners Fund III, L.P., By: ArcLight PEF GP III, LLC, the sole general partner, By: ArcLight Capital Holdings, LLC, the sole manager, By: /s/ Daniel R. Revers, Managing Partner of ArcLight Capital Holdings, LLC</signatureName>
        <signatureDate>2010-10-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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