Mobil Exploration & Producing U.S. Inc. has penetrated two Gulf of Mexico gas reservoirs a half mile apart with a single horizontal hole. After drilling horizontally through the first targeted gas interval, Mobil turned the well's horizontal section slightly upward to penetrate the second zone 189 ft higher. Mobil drilled the well from E platform on High Island Block A-574 in the western gulf about 100 miles off Galveston, Tex. Greg Cox, area producing manager in Mobil's New Orleans office, likened the feat to pushing a steel pipeline up a half mile incline to the 20th floor of a building. He estimated the cost ...

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