FOR IMMEDIATE RELEASE Contact Guy T. Marcus Edward P. Delson July 14, 1997 VP-Inv. Rel. Sr. VP-CFO Halliburton NUMAR (214) 978-2691 (610) 251-0116 HART-SCOTT-RODINO ANTITRUST CLEARANCE FOR NUMAR DALLAS, Texas -- Halliburton Company (NYSE:HAL) and NUMAR Corporation (NASDAQ:NUMR) said today that the waiting period for Hart-Scott-Rodino anti-trust review of Halliburton's planned acquisition of NUMAR Corporation lapsed as of July 13, 1997. Both companies stated that they expect the acquisition to close in the 1997 third quarter, following completion of SEC review of NUMAR's proxy statement for a special shareholders meeting and assuming approval of the acquisition by NUMAR shareholders at such meeting. The date of such shareholders meeting has not been set, but will take place as soon as practicable. NUMAR is the world leader and pioneer in the design, manufacture, and marketing of commercial applications of magnetic resonance imaging ("MRI") technology for oil and gas exploration and development. NUMAR's patented proprietary device, the MRIL( tool, applies MRI technology to fluid estimation and formation evaluation in newly-drilled oil and gas wells to improve estimates of reserve and well productivity. -more- Page 5 of 6 Pages The Exhibit Index Appears on Page 4 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. # # # Page 6 of 6 Pages The Exhibit Index Appears on Page 4