By the OGJ Online Staff
HOUSTON, Sept. 4 -- Unocal Corp. said Tuesday its Unocal Rapak Ltd. subsidiary has drilled two successful appraisal wells on the Ranggas prospect in the southern part of the Rapak Production-Sharing Contract area off East Kalimantan, Indonesia.
The holes followed the discovery announced in January 2001. Both encountered "significant" oil and gas pay, the company said.
The Ranggas-2 well had 155 ft of net oil pay and 18 ft of net gas pay. The well was drilled to 13,661 ft TD in 5,192 ft of water. The Ranggas-2 is in the southern portion of the structure, nearly 1 mile southwest of the discovery.
The Ranggas-3 well encountered 306 ft of net oil pay and 123 ft of net gas pay. The well was drilled in 5,368 ft of water to 13,248 ft vertical depth. It is 3.4 miles north of the discovery in the central portion of the structure.
Based on drilling to date, the company estimates the gross unrisked resource potential for the Ranggas structure is between 190 million and 650 million boe.
"We are extremely encouraged by the significant oil component of the Ranggas discovery," said Charles Williamson, Unocal CEO. "Our Kutei basin program has been extremely successful, but until now we have found more gas than oil. Given Ranggas and the 'look-alike' adjacent prospects that we have developed, we are excited about the next phase of our exploration program, which will definitely be oil-focused."
Unocal Rapak plans to drill 4-8 wells beginning late in 2001 or early in 2002 to further delineate the Ranggas discovery and test at least two adjacent prospects. The company expects to determine commerciality and the size of the production facilities in this second drilling phase.
Unocal Rapak is operator of the Rapak PSC area with 80%. Lasmo Rapak Ltd., an ENI SPA subsidiary, holds the rest.
