Unocal Tests Giant Discovery Offshore Indonesia
Unocal Corporation has successfully tested an appraisal well on the giant deepwater Gendalo-Gandang gas field complex offshore Indonesia.
"The gas rates are impressive, but we are most encouraged by the high condensate rates tested from the appraisal well in the Gendalo field," said Charles R. Williamson, Unocal chairman and chief executive officer. "The results demonstrate that this is a world class gas-condensate resource, which could supply gas to Indonesia's Bontang liquefied natural gas (LNG) facilities by the end of the decade, and, more importantly, produce significant liquids even sooner."
The Gendalo-3 well flowed at a daily rate of 30 million cubic feet (mmcf) of gas and 2,200 barrels of condensate from a single interval between 11,559 feet (3,523 meters) and 11,638 feet (3,547 meters) true vertical depth subsea (TVDS). The drillstem test had flowing tubing pressure of 4,114 pounds per square inch on a 40/64-inch choke.
The well has an estimated potential daily production rate at upwards of 90 million cubic feet of gas and 6,000 barrels of condensate per day.
The Gendalo-3 well encountered 102 feet (31 meters) of net pay. The well was drilled in 5,082 feet (1,549 meters) of water to 13,070 feet (3,984 meters) TVDS. The well is located 2.8 miles (4.5 kilometers) east of the Gendalo-1 discovery well in the central portion of the Gendalo-Gandang gas field complex.
Another appraisal well, Gandang-2, was drilled in the northern portion of the complex. This well encountered 185 feet (56 meters) of net gas pay. The well was drilled to 12,000 feet (3,658 meters) TVDS in 5,613 feet (1,711 meters) of water. The Gandang-2 well is located 2.2 miles (3.5 kilometers) south of the Gandang-1 discovery well.
Williamson noted that the reservoirs for the Gendalo and Gandang appraisal wells are both in pressure communication with previous wells, indicating significant resource potential and the robustness of the high quality sand deposition.
Unocal estimates the gross resource potential for the Gendalo-Gandang complex is at least 2.0 to 2.5 trillion cubic feet of gas, plus an associated 50 to 150 million barrels of condensate. Work to certify this resource and plan its development began in early 2001 and will continue.
Unocal Ganal is operator of the Ganal production-sharing contract area.
It holds an 80-percent working interest, while Lasmo Ganal, Limited, a subsidiary of ENI, holds the remaining 20-percent working interest.