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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 Gz7BAXhl4p+mZuPk6gJfAQ==

<SEC-DOCUMENT>0001209191-06-027517.txt : 20060503
<SEC-HEADER>0001209191-06-027517.hdr.sgml : 20060503
<ACCEPTANCE-DATETIME>20060503215127
ACCESSION NUMBER:		0001209191-06-027517
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060501
FILED AS OF DATE:		20060503
DATE AS OF CHANGE:		20060503

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ogren D John
		CENTRAL INDEX KEY:			0001309016

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14273
		FILM NUMBER:		06805877

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		713-497-3086

	MAIL ADDRESS:	
		STREET 1:		12568 MEMORIAL DRIVE
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CORE LABORATORIES N V
		CENTRAL INDEX KEY:			0001000229
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL, GAS FIELD SERVICES, NBC [1389]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			P7
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1017 BZ AMSTERDAM
		STREET 2:		HERENGRACHT 424
		CITY:			THE NETHERLANDS
		STATE:			P7
		BUSINESS PHONE:		3124203191

	MAIL ADDRESS:	
		STREET 1:		6316 WINDFERN
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77040
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>h35739_6djo.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-05-01</periodOfReport>

    <issuer>
        <issuerCik>0001000229</issuerCik>
        <issuerName>CORE LABORATORIES N V</issuerName>
        <issuerTradingSymbol>CLB</issuerTradingSymbol>
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        <reportingOwnerId>
            <rptOwnerCik>0001309016</rptOwnerCik>
            <rptOwnerName>Ogren D John</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>12568 MEMORIAL DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77024</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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            <securityTitle>
                <value>Common Shares</value>
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            <transactionDate>
                <value>2006-05-01</value>
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            <transactionCoding>
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                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
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            <transactionAmounts>
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                    <value>10000</value>
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                <transactionPricePerShare>
                    <value>23.00</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
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            <transactionDate>
                <value>2006-05-01</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
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                <transactionPricePerShare>
                    <value>25.00</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>132000</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
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            <transactionDate>
                <value>2006-05-01</value>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>13651</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>63.00</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>118349</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Option to Exercise</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>28.00</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-05-01</value>
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            <transactionCoding>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>2001-05-25</value>
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            <expirationDate>
                <value>2010-05-25</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            <conversionOrExercisePrice>
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            <transactionDate>
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            <transactionAmounts>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
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            <underlyingSecurity>
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            <securityTitle>
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            <transactionAmounts>
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                    <value>10000</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
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                    <value>0</value>
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            <ownershipNature>
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    <ownerSignature>
        <signatureName>/s/ John D. Denson, Attorney-in-Fact</signatureName>
        <signatureDate>2006-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----