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<title>Core Laboratories N.V. 8K Earnings Revision</title>
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<b><font SIZE="2">
</font><font SIZE="4">
<p ALIGN="CENTER">UNITED STATES</p>
<p ALIGN="CENTER">SECURITIES AND EXCHANGE COMMISSION</p>
</font><font SIZE="2">
<p ALIGN="CENTER">Washington, D.C. 20549</p>
</font></b><font SIZE="2">
<p ALIGN="CENTER">________________</p>
</font><b><font SIZE="5">
<p ALIGN="CENTER">FORM 8-K</p>
</font></b>
<p ALIGN="CENTER"><center>
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  <center>
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    <td VALIGN="TOP">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td VALIGN="TOP"><font SIZE="2">
      <p>CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934</font></td>
  </tr>
  <tr>
    <td VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td VALIGN="MIDDLE"><font SIZE="2">
      <p ALIGN="CENTER">Date of report and date of earliest event reported:<b>
      April 3, 2006</b></font></td>
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    <td VALIGN="MIDDLE">
      <p>&nbsp;</td>
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  </center>
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</center><font SIZE="2">
<p>&nbsp;</p>
<p>&nbsp;</p>
</font><b><font FACE="Times" SIZE="5">
<p ALIGN="CENTER">CORE LABORATORIES N.V.</p>
</font></b><font SIZE="2">
<p ALIGN="CENTER">(Exact name of registrant as specified in its charter)</p>
<p ALIGN="CENTER"><b>001-14273<br>
</b>(Commission File Number)</p>
</font>
<p ALIGN="CENTER"><center>
<div align="center">
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<table CELLSPACING="0" BORDER="0" CELLPADDING="0" WIDTH="680">
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    <td WIDTH="51%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p ALIGN="CENTER">The Netherlands</font></b></td>
    <td WIDTH="49%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p ALIGN="CENTER">Not Applicable</font></b></td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE"><font SIZE="2">
      <p ALIGN="CENTER">(State or other jurisdiction of incorporation or
      organization)</font></td>
    <td WIDTH="49%" VALIGN="MIDDLE"><font SIZE="2">
      <p ALIGN="CENTER">(I.R.S. Employer Identification No.)</font></td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="49%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p ALIGN="CENTER">Herengracht 424</font></b></td>
    <td WIDTH="49%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p ALIGN="CENTER">1017 BZ Amsterdam</font></b></td>
    <td WIDTH="49%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p ALIGN="CENTER">The Netherlands</font></b></td>
    <td WIDTH="49%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p ALIGN="CENTER">Not Applicable</font></b></td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE"><font SIZE="2">
      <p ALIGN="CENTER">(Address of principal executive offices)</font></td>
    <td WIDTH="49%" VALIGN="MIDDLE"><font SIZE="2">
      <p ALIGN="CENTER">(Zip Code)</font></td>
  </tr>
  <tr>
    <td WIDTH="51%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="49%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
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</table>
  </center>
</div>
</center><font SIZE="2">
<p ALIGN="CENTER">Registrant's telephone number, including area code: <b>(31-20)
420-3191</b></p>
<p ALIGN="CENTER">&nbsp;</p>
<p ALIGN="left"><font SIZE="2">Check the appropriate below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions: </font></p>
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    <p align="center">___</td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">
    <p class="MsoNormal"><font SIZE="2">Written communications
    pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</font></td>
  </tr>
  <tr>
    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium">&nbsp;</td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">&nbsp;</td>
  </tr>
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    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium">
      <font SIZE="2">
      <p align="center">___</font></td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">
      <p class="MsoNormal"><font SIZE="2">Soliciting material
      pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></td>
  </tr>
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    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium">&nbsp;</td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">
      &nbsp;</td>
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    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium"><font SIZE="2">
    <p align="center">___</font></td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">
      <p class="MsoNormal"><font SIZE="2">Pre-commencement
      communications pursuant to Rule&nbsp;14d-2(b) under the Exchange Act (17 CFR
      240.14d-2 (b))</font></td>
  </tr>
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    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium">&nbsp;</td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">&nbsp;</td>
  </tr>
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    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium"><font SIZE="2">
    <p align="center">___</font></td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">
    <p class="MsoNormal"><font SIZE="2">Pre-commencement
    communications pursuant to Rule&nbsp;13e-4(c) under the Exchange Act (17 CFR
    240.13e-4 (c))</font></td>
  </tr>
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    <td WIDTH="44" VALIGN="MIDDLE" style="border-style: none; border-width: medium">
      &nbsp;</td>
    <td WIDTH="636" VALIGN="MIDDLE" style="border-left-style: none; border-left-width: medium">
      &nbsp;</td>
  </tr>
</table>
<hr>
<p>&nbsp;</p>
<b>
<p>Item 2.02 Results of Operations and Financial Condition</p>
</b>
<p><font SIZE="2">On April 3, 2006, Core Laboratories N.V. issued
a press release updating its previously issued forward-looking guidance for its
2006 first and second fiscal quarters and full year. A copy of the press release is attached
to this Report as Exhibit 99.1.</font></p>
<p>The information in this Report and the exhibit attached hereto shall not be
deemed &quot;filed&quot; for purposes of Section 18 of the Securities Exchange Act of
1934, as amended (the &quot;Exchange Act&quot;), nor shall they be deemed incorporated by
reference in any filing under the Securities Act of 1933, as amended, or the
Exchange Act, except as shall be expressly stated by specific reference in such
filing.</p>
<p><font face="Times New Roman" size="2">In addition to financial results
determined in accordance with generally accepted accounting principles (&quot;GAAP&quot;)
that are included in the attached press release, certain  non-GAAP financial measures (as defined under the SEC's
Regulation&nbsp;G) were used in the press release: </font></p>
<p>&nbsp;</p>
<div align="center">
  <center>
  <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber2" height="215">
    <tr>
      <td width="100%" height="19" colspan="3" align="center"><b>Non-GAAP
      Financial Measures Included In Press Release</b></td>
    </tr>
    <tr>
      <td width="5%" height="19">&nbsp;</td>
      <td width="4%" align="center" height="19" valign="top">&nbsp;</td>
      <td width="91%" height="19">&nbsp;</td>
    </tr>
    <tr>
      <td width="5%" height="9"></td>
      <td width="4%" align="center" height="9" valign="top">*</td>
      <td width="91%" height="9" align="left" valign="top"><font size="2"><b>Earnings per Diluted Share,
      Excluding FAS 123R Costs; or Earnings per Diluted Share, Excluding FAS
      123R Costs and Senior Note Prepayment Costs:</b><font face="Times New Roman" size="2"><b><i>
      </i></b> </font><b><i>
      &nbsp;</i></b>Management
      believes that the exclusion of certain expenses and credits enables it to
      evaluate more effectively the Company's operations period-over-period and
      to identify operating trends that could otherwise be masked by the
      excluded items.&nbsp; For this reason, we used certain  non-GAAP measures
      that exclude these non-recurring items;
      we felt that presentation provides the public a clearer comparison with the numbers reported
      in prior quarters.</font></td>
    </tr>
    <tr>
      <td width="5%" height="19">&nbsp;</td>
      <td width="4%" align="center" height="19" valign="top">&nbsp;</td>
      <td width="91%" height="19">&nbsp;</td>
    </tr>
    <tr>
      <td width="5%" height="19">&nbsp;</td>
      <td width="4%" align="center" height="19" valign="top">*</td>
      <td width="91%" height="19" align="left" valign="top"><b><font size="2">Incremental Operating
      Margins:</font></b><font size="2"> Incremental operating margins is
      computed as (1) the increase or decrease in income from continuing
      operations before equity-based stock compensation, interest expense and income tax expense between two
      periods, divided by (2) the increase or decrease in revenues between the
      same two periods. Management believes that incremental operating margins provide
      useful information regarding the growth over the two periods being
      compared.</font></td>
    </tr>
    </table>
  </center>
</div>
<p><br>
The following tables reconcile non-GAAP measures included in the press release
to the most comparable GAAP measures:</p>
<p>&nbsp;</p>
</font>
<p align="center"><b>Reconciliation of Diluted Earnings Per Share</b></p>
<font SIZE="2">
<div align="center">
  <center>
  <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="80%">
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="18%">&nbsp;</td>
      <td width="3%">&nbsp;</td>
      <td width="20%">&nbsp;</td>
    </tr>
    <tr>
      <td width="59%"><b><font size="2">Forecasted First Fiscal Quarter 2006</font></b></td>
      <td width="18%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">Low end <br>
      of range</font></b></td>
      <td width="3%" align="center">&nbsp;</td>
      <td width="20%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">High end <br>
      of range</font></b></td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="41%" style="border-top-style: solid; border-top-width: 1" align="right" colspan="3">
      <p align="center"><b><font size="2">(Unaudited)</font></b></td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Net Income</font></td>
      <td width="18%" align="right"><font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.49&nbsp;</font></td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right"><font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.51&nbsp;</font></td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Plus: FAS 123R Cost</font></td>
      <td width="18%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">0.10&nbsp;</font></td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">0.10&nbsp;</font></td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Net Income Before the Impact of FAS
      123R Cost</font></td>
      <td width="18%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.59&nbsp;</font></div>
      </td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.61&nbsp;</font></div>
      </td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="18%" align="right">&nbsp;</td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right">&nbsp;</td>
    </tr>
  </table>
  </center>
</div>
<p>&nbsp;</p>
<div align="center">
  <center>
  <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="80%">
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="18%">&nbsp;</td>
      <td width="3%">&nbsp;</td>
      <td width="20%">&nbsp;</td>
    </tr>
    <tr>
      <td width="59%"><b><font size="2">Forecasted Full Year 2006</font></b></td>
      <td width="18%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">Low end <br>
      of range</font></b></td>
      <td width="3%" align="center">&nbsp;</td>
      <td width="20%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">High end <br>
      of range</font></b></td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="41%" style="border-top-style: solid; border-top-width: 1" align="right" colspan="3"><font SIZE="2">
      <p align="center"><b>(Unaudited)</b></font></td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Net Income</font></td>
      <td width="18%" align="right"><font size="2">2.20&nbsp;</font></td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right"><font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.30&nbsp;</font></td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Plus: FAS 123R Cost</font></td>
      <td width="18%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">0.22&nbsp;</font></td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">0.22&nbsp;</font></td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Net Income Before the Impact of FAS
      123R Cost</font></td>
      <td width="18%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.42&nbsp;</font></div>
      </td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.52&nbsp;</font></div>
      </td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="18%" align="right">&nbsp;</td>
      <td width="3%" align="right">&nbsp;</td>
      <td width="20%" align="right">&nbsp;</td>
    </tr>
  </table>
  </center>
</div>
<p>&nbsp;</p>
<div align="center">
  <center>
  <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="80%">
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="17%">&nbsp;</td>
      <td width="2%">&nbsp;</td>
      <td width="22%">&nbsp;</td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="17%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <font SIZE="2">
<FONT FACE="Times New Roman" SIZE=2>
<B><P ALIGN="CENTER">Three Months Ended<br>
      March 31, 2005</B></FONT></font></td>
      <td width="2%" align="center">&nbsp;</td>
      <td width="22%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <font SIZE="2">
<FONT FACE="Times New Roman" SIZE=2>
<B><P ALIGN="CENTER">Twelve Months Ended<br>
      December 31, 2005</B></FONT></font></td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="41%" style="border-top-style: solid; border-top-width: 1" align="right" colspan="3">&nbsp;</td>
    </tr>
    <tr>
      <td width="59%"><font size="2">Net Income From Continuing Operations</font></td>
<TD WIDTH="19%" VALIGN="BOTTOM">
<FONT FACE="Times New Roman" SIZE=2><P ALIGN="RIGHT">$ &nbsp;&nbsp;&nbsp;&nbsp;0.31&nbsp;</FONT></TD>
      <td width="2%" align="right" style="border-bottom-style: none; border-bottom-width: medium">&nbsp;</td>
<TD WIDTH="23%" VALIGN="BOTTOM">
<FONT FACE="Times New Roman" SIZE=2><P ALIGN="RIGHT">$ &nbsp;&nbsp;&nbsp;&nbsp;1.13&nbsp;</FONT></TD>
    </tr>
    <tr>
      <td width="59%" style="border-right-style: none; border-right-width: medium">
<FONT FACE="Times New Roman" SIZE=2>Debt Prepayment Charge</FONT></td>
<TD WIDTH="19%" VALIGN="BOTTOM">
<p ALIGN="RIGHT"><font face="Times New Roman" size="2">-&nbsp;</font></TD>
      <td width="2%" align="right" style="border-style: none; border-width: medium">&nbsp;</td>
<TD WIDTH="23%" VALIGN="BOTTOM">
<FONT FACE="Times New Roman" SIZE=2><P ALIGN="RIGHT">0.15&nbsp;</FONT></TD>
    </tr>
    <tr>
      <td width="59%" style="border-right-style: none; border-right-width: medium">
<FONT FACE="Times New Roman" SIZE=2>Performance Share Award Program</FONT></td>
<TD WIDTH="19%" VALIGN="BOTTOM">
<p ALIGN="RIGHT"><font face="Times New Roman" size="2">0.01&nbsp;</font></TD>
      <td width="2%" align="right" style="border-style: none; border-width: medium">&nbsp;</td>
<TD WIDTH="23%" VALIGN="BOTTOM">
<FONT FACE="Times New Roman" SIZE=2><P ALIGN="RIGHT">0.25&nbsp;</FONT></TD>
    </tr>
    <tr>
      <td width="59%" style="border-right-style: none; border-right-width: medium">
<FONT FACE="Times New Roman" SIZE=2>Restricted Share Award Program</FONT></td>
<TD WIDTH="19%" VALIGN="BOTTOM">
<font SIZE="2">
<p ALIGN="RIGHT"><font face="Times New Roman" size="2">0.01&nbsp;</font></font></TD>
      <td width="2%" align="right" style="border-style: none; border-width: medium">&nbsp;</td>
<TD WIDTH="23%" VALIGN="BOTTOM">
<FONT FACE="Times New Roman" SIZE=2><P ALIGN="RIGHT">0.13&nbsp;</FONT></TD>
    </tr>
    <tr>
      <td width="59%"><font size="2" face="Times New Roman">Change in Tax Rate</font></td>
<TD WIDTH="19%" VALIGN="bottom" style="border-bottom-style: solid; border-bottom-width: 1">
<font SIZE="2">
<p ALIGN="RIGHT"><font face="Times New Roman" size="2">-&nbsp;</font></font></TD>
      <td width="2%" align="right" style="border-top-style: none; border-top-width: medium">&nbsp;</td>
<TD WIDTH="23%" VALIGN="bottom" style="border-bottom-style: solid; border-bottom-width: 1">
<FONT FACE="Times New Roman" SIZE=2><P ALIGN="RIGHT">0.08&nbsp;</FONT></TD>
    </tr>
    <tr>
      <td width="59%"><font size="2">Net Income From Continuing Operations
      Before the Impact of <br>
      &nbsp;&nbsp;&nbsp;FAS 123R Cost <font size="2" face="Times New Roman">and Senior Note
      Prepayment Costs</font></font></td>
      <td width="19%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
<FONT FACE="Times New Roman" SIZE=2>
<P ALIGN="RIGHT">                            $ &nbsp;&nbsp;&nbsp;&nbsp;0.33&nbsp;&nbsp;  </FONT>
      </div>
      </td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="23%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
<FONT FACE="Times New Roman" SIZE=2>
<P ALIGN="RIGHT">                            $ &nbsp;&nbsp;&nbsp;&nbsp;1.74&nbsp;&nbsp;  </FONT>
      </div>
      </td>
    </tr>
    <tr>
      <td width="59%">&nbsp;</td>
      <td width="17%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="22%" align="right">&nbsp;</td>
    </tr>
  </table>
  </center>
</div>
<p>&nbsp;</p>
</font>
<p align="center"><b>Computation of Forecasted Incremental Operating Margin</b></p>
<font SIZE="2">
<div align="center">
  <center>
  <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="80%">
    <tr>
      <td width="54%">&nbsp;</td>
      <td width="14%" align="center"><b><font size="2">March 31,</font></b></td>
      <td width="2%" align="center">&nbsp;</td>
      <td width="14%" align="center"><b><font size="2">March 31,</font></b></td>
      <td width="2%" align="center">&nbsp;</td>
      <td width="15%" align="center">&nbsp;</td>
    </tr>
    <tr>
      <td width="54%">&nbsp;</td>
      <td width="14%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">2005</font></b></td>
      <td width="2%" align="center">&nbsp;</td>
      <td width="14%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">2006</font></b></td>
      <td width="2%" align="center">&nbsp;</td>
      <td width="15%" align="center" style="border-bottom-style: solid; border-bottom-width: 1">
      <b><font size="2">Change</font></b></td>
    </tr>
    <tr>
      <td width="54%">&nbsp;</td>
      <td width="14%" align="right" style="border-top-style: solid; border-top-width: 1">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="30%" align="right" style="border-top-style: solid; border-top-width: 1" colspan="3"><font SIZE="2">
      <p align="center"><b>(Unaudited)</b></font></td>
    </tr>
    <tr>
      <td width="54%"><font size="2">Operating Income</font></td>
      <td width="14%" align="right"><font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14,028</font></td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right"><font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;19,100</font></td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right"><font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5,072</font></td>
    </tr>
    <tr>
      <td width="54%"><font size="2">Plus: FAS 123R Costs</font></td>
      <td width="14%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">548</font></td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">2,900</font></td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right" style="border-bottom-style: solid; border-bottom-width: 1">
      <font size="2">2,352</font></td>
    </tr>
    <tr>
      <td width="54%"><font size="2">Operating Income Before Impact of FAS 123R
      Costs</font></td>
      <td width="14%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14,576</font></div>
      </td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;22,000</font></div>
      </td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right" style="border-top-style: solid; border-top-width: 1">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7,424</font></div>
      </td>
    </tr>
    <tr>
      <td width="54%">&nbsp;</td>
      <td width="14%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right">&nbsp;</td>
    </tr>
    <tr>
      <td width="54%"><font size="2">Revenue</font></td>
      <td width="14%" align="right">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;115,955</font></div>
      </td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;133,500</font></div>
      </td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">$&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;17,545</font></div>
      </td>
    </tr>
    <tr>
      <td width="54%">&nbsp;</td>
      <td width="14%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right">&nbsp;</td>
    </tr>
    <tr>
      <td width="54%"><font size="2">Incremental Operating Margin</font></td>
      <td width="14%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right">
      <div style="border-bottom-style: double; border-bottom-width: 3">
        <font size="2">42%</font></div>
      </td>
    </tr>
    <tr>
      <td width="54%">&nbsp;</td>
      <td width="14%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="13%" align="right">&nbsp;</td>
      <td width="2%" align="right">&nbsp;</td>
      <td width="15%" align="right">&nbsp;</td>
    </tr>
  </table>
  </center>
</div>
<p>&nbsp;</p>
<b><p><font SIZE="2">Item 9.01 Financial Statements and Exhibits</font></p>
<table class="MsoNormalTable" style="width: 468.75pt" cellSpacing="0" cellPadding="0" width="625" border="0">
  <tr>
    <td style="width: 4%; padding: 0in" width="4%">&nbsp;</td>
    <td style="width: 4%; padding: 0in" width="4%">
    <p style="text-align: center" align="right"><font SIZE="2">(d)</font></td>
    <td style="width: 1%; padding: 0in" width="1%">&nbsp;</td>
    <td style="width: 91%; padding: 0in" width="91%"><i>
    <font SIZE="2">Exhibits</font></i></td>
  </tr>
</table>
</b>
<p><font SIZE="2">99.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Press release issued on April 3, 2006*</font></p>
<p>* This exhibit is intended to be furnished and shall not be deemed &quot;filed&quot;
for purposes of the Securities Act of 1934, as amended.</p>
<b>
<hr>
<p ALIGN="CENTER">SIGNATURES</b></p>
<p>Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
</font>
<center>
<div align="right">
<table BORDER="0" CELLSPACING="0" WIDTH="635" cellpadding="0">
  <tr>
    <td WIDTH="47%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="5%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="40%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="47%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="5%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="48%" VALIGN="TOP" COLSPAN="5"><font SIZE="2">
      <p>Core Laboratories N.V.</font></td>
  </tr>
  <tr>
    <td WIDTH="47%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="5%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="40%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="47%" VALIGN="TOP"><font SIZE="2">
      <p>Dated: April 5, 2006</font></td>
    <td WIDTH="5%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP"><font SIZE="2">
      <p>By</font></td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="40%" VALIGN="TOP"><font SIZE="2">
      <p style="border-bottom-style: solid; border-bottom-width: 1">/s/ Richard L. Bergmark</font></td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="47%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="5%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="40%" VALIGN="TOP"><font SIZE="2">
      <p>Richard L. Bergmark</font></td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="47%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="5%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="40%" VALIGN="TOP"><font SIZE="2">
      <p>Chief Financial Officer</font></td>
    <td WIDTH="1%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="TOP">
      <p>&nbsp;</td>
  </tr>
</table>
</div>
</center><font SIZE="2">
<p>&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<hr>
</font>
<b><font SIZE="2">
<p ALIGN="CENTER">SECURITIES AND EXCHANGE COMMISSION<br>
Washington, D.C. 20549</font></b></p>
<font SIZE="2"><b>
<p ALIGN="CENTER">CORE LABORATORIES N.V.<br>
EXHIBIT INDEX TO FORM 8-K</b></p>
<p ALIGN="left">&nbsp;</p>
<p ALIGN="left">&nbsp;</p>
<p ALIGN="left">&nbsp;</p>
</font>
<center>
<div align="left">
<table CELLSPACING="0" BORDER="0" WIDTH="570" cellpadding="0">
  <tr>
    <td WIDTH="22%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="75%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="22%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p>EXHIBIT NO.</font></b></td>
    <td WIDTH="3%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="75%" VALIGN="MIDDLE"><b><font SIZE="2">
      <p>ITEM</font></b></td>
  </tr>
  <tr>
    <td WIDTH="22%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="3%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="75%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
  </tr>
  <tr>
    <td WIDTH="22%" VALIGN="TOP"><font SIZE="2">
      <p>99.1</font></td>
    <td WIDTH="3%" VALIGN="MIDDLE">
      <p>&nbsp;</td>
    <td WIDTH="75%" VALIGN="TOP">
      <p><font SIZE="2">Press release issued on April 3, 2006*</font></td>
  </tr>
</table>
</div>
</center>
<font SIZE="2">
<p>* This exhibit is intended to be furnished and shall not be deemed &quot;filed&quot;
for purposes of the Securities Act of 1934, as amended.</p>
</font>
<p ALIGN="left">&nbsp;</p>

</body>

</html>
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{"company-data": {"conformed-name": "CORE LABORATORIES N V", "cik": "0001000229", "assigned-sic": "1389", "irs-number": "000000000", "state-of-incorporation": "P7", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-14273", "film-number": "06740787"}, "business-address": {"street1": "1017 BZ AMSTERDAM", "street2": "HERENGRACHT 424", "city": "THE NETHERLANDS", "state": "P7", "phone": "3124203191"}, "mail-address": {"street1": "6316 WINDFERN", "city": "HOUSTON", "state": "TX", "zip": "77040"}}
Core Laboratories N.V. 8K Earnings Revision
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
________________
FORM 8-K
CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
Date of report and date of earliest event reported:
April 3, 2006
CORE LABORATORIES N.V.
(Exact name of registrant as specified in its charter)
001-14273
(Commission File Number)
The Netherlands
Not Applicable
(State or other jurisdiction of incorporation or
      organization)
(I.R.S. Employer Identification No.)
Herengracht 424
1017 BZ Amsterdam
The Netherlands
Not Applicable
(Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including area code:
(31-20)
420-3191
Check the appropriate below if the
Form 8-K filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions:
___
Written communications
    pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
___
Soliciting material
      pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
___
Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2 (b))
___
Pre-commencement
    communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
    240.13e-4 (c))
Item 2.02 Results of Operations and Financial Condition
On April 3, 2006, Core Laboratories N.V. issued
a press release updating its previously issued forward-looking guidance for its
2006 first and second fiscal quarters and full year. A copy of the press release is attached
to this Report as Exhibit 99.1.
The information in this Report and the exhibit attached hereto shall not be
deemed "filed" for purposes of Section 18 of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), nor shall they be deemed incorporated by
reference in any filing under the Securities Act of 1933, as amended, or the
Exchange Act, except as shall be expressly stated by specific reference in such
filing.
In addition to financial results
determined in accordance with generally accepted accounting principles ("GAAP")
that are included in the attached press release, certain  non-GAAP financial measures (as defined under the SEC's
Regulation G) were used in the press release:
Non-GAAP
      Financial Measures Included In Press Release
*
Earnings per Diluted Share,
      Excluding FAS 123R Costs; or Earnings per Diluted Share, Excluding FAS
      123R Costs and Senior Note Prepayment Costs:
Management
      believes that the exclusion of certain expenses and credits enables it to
      evaluate more effectively the Company's operations period-over-period and
      to identify operating trends that could otherwise be masked by the
      excluded items.  For this reason, we used certain  non-GAAP measures
      that exclude these non-recurring items;
      we felt that presentation provides the public a clearer comparison with the numbers reported
      in prior quarters.
*
Incremental Operating
      Margins:
Incremental operating margins is
      computed as (1) the increase or decrease in income from continuing
      operations before equity-based stock compensation, interest expense and income tax expense between two
      periods, divided by (2) the increase or decrease in revenues between the
      same two periods. Management believes that incremental operating margins provide
      useful information regarding the growth over the two periods being
      compared.
The following tables reconcile non-GAAP measures included in the press release
to the most comparable GAAP measures:
Reconciliation of Diluted Earnings Per Share
Forecasted First Fiscal Quarter 2006
Low end
of range
High end
of range
(Unaudited)
Net Income
$       0.49
$       0.51
Plus: FAS 123R Cost
0.10
0.10
Net Income Before the Impact of FAS
      123R Cost
$       0.59
$        0.61
Forecasted Full Year 2006
Low end
of range
High end
of range
(Unaudited)
Net Income
2.20
$       2.30
Plus: FAS 123R Cost
0.22
0.22
Net Income Before the Impact of FAS
      123R Cost
$       2.42
$        2.52
Three Months Ended
March 31, 2005
Twelve Months Ended
December 31, 2005
Net Income From Continuing Operations
$     0.31
$     1.13
Debt Prepayment Charge
-
0.15
Performance Share Award Program
0.01
0.25
Restricted Share Award Program
0.01
0.13
Change in Tax Rate
-
0.08
Net Income From Continuing Operations
      Before the Impact of
FAS 123R Cost
and Senior Note
      Prepayment Costs
$     0.33
$     1.74
Computation of Forecasted Incremental Operating Margin
March 31,
March 31,
2005
2006
Change
(Unaudited)
Operating Income
$       14,028
$       19,100
$       5,072
Plus: FAS 123R Costs
548
2,900
2,352
Operating Income Before Impact of FAS 123R
      Costs
$       14,576
$       22,000
$       7,424
Revenue
$     115,955
$     133,500
$     17,545
Incremental Operating Margin
42%
Item 9.01 Financial Statements and Exhibits
(d)
Exhibits
99.1        
Press release issued on April 3, 2006*
* This exhibit is intended to be furnished and shall not be deemed "filed"
for purposes of the Securities Act of 1934, as amended.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.
Core Laboratories N.V.
Dated: April 5, 2006
By
/s/ Richard L. Bergmark
Richard L. Bergmark
Chief Financial Officer
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
CORE LABORATORIES N.V.
EXHIBIT INDEX TO FORM 8-K
EXHIBIT NO.
ITEM
99.1
Press release issued on April 3, 2006*
* This exhibit is intended to be furnished and shall not be deemed "filed"
for purposes of the Securities Act of 1934, as amended.