

 FOR IMMEDIATE RELEASE   Contact- Guy T. Marcus        Edward P. Delson
 August 29,  1997                 VP-Inv. Rel.         Sr. VP-CFO
                                  Halliburton          NUMAR
                                 (214) 978-2691        (610) 251-0116


    HALLIBURTON AND NUMAR UPDATE ACQUISITION PLANS


      DALLAS,  Texas -- Halliburton Company (NYSE-HAL)  announced today that the
 company's  Form S-4  registration  statement  under the Securities Act of 1933,
 filed with the  Securities and Exchange  Commission on August 26, 1997,  became
 effective today.  The Form S-4  registration  statement was filed in connection
 with  Halliburton's  plans to acquire NUMAR Corporation  (NASDAQ- NUMR) through
 the exchange of 0.9664 of a share of Halliburton common stock for each share of
 NUMAR common stock.

     NUMAR  Corporation  announced today that it has fixed the close of business
 on July 25, 1997, as the record date for determination of shareholders entitled
 to notice of and to vote at a special meeting of its  shareholders on September
 30, 1997, to approve a merger agreement between the companies.

     Halliburton  and NUMAR  also  announced  that a proxy  statement/prospectus
 relating to the merger  will be  distributed  on  September  2, 1997,  to NUMAR
 shareholders  entitled to vote at the special  meeting  scheduled for September
 30, 1997.

                                      more

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     NUMAR  Corporation  was founded in 1983 and maintains its  headquarters  in
 Malvern,  Pennsylvania.  The company employs about 140 persons and provides its
 proprietary  Magnetic  Resonance  Imaging Logging (MRIL ) tool,  which utilizes
 magnetic resonance imaging technology widely used in medical diagnostic imaging
 devices,  to evaluate  subsurface  rock formations in newly drilled oil and gas
 wells.  Such  services are  provided to over 200 oil and gas company  customers
 worldwide.

      Halliburton  Company  is one of the  world's  largest  diversified  energy
 services,engineering, maintenance, and construction companies. Founded in 1919,
 Halliburton provides a broad range of energy services and products,  industrial
 and marine engineering and construction services.
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