Kutei basin appraisal well finds large gas-condensate reserve, oil zone

By OGJ editors

HOUSTON, Mar. 5 -- An appraisal well at Gehem deepwater field in the Kutei basin off East Kalimantan, Indonesia, encountered a single zone with the potential to contain as much as 1.5 tcf of recoverable gas, said operator Unocal Corp.

Gehem-2 well results showed the primary zone of interest to have a single gas column of greater than 550 ft. The zone flowed at the rate of 31.3 MMcfd of gas and 1,917 b/d of condensate with 6,545 psi FTP on a 32/64 in. choke on a drillstem test at 15,362-523 ft TVD subsea. Equipment capacity limited the test rate.

Gehem-2, 300 ft downdip of Gehem-1, cut 240 ft of net gas pay in zones penetrated by Gehem-1 and beneath those zones discovered 55 ft of net oil pay in a single zone (OGJ Online, Aug. 11, 2003). Unocal did not test the oil zone.

Gehem-2 went to TVD 17,505 ft in 6,036 ft of water 1.8 miles south of Gehem-1 on the Ganal production sharing contract.

Unocal was moving the rig to drill a deep test on the Gula structure, a large anticline just south of Gehem. Then it will return to drill Gehem-3 in the second quarter of 2004 to appraise Gehem's northwest flank.

Unocal Ganal operates the Ganal PSC with 80% working interest. ENI-Ganal Ltd. has 20%.

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