Gendalo targeted for 2007
Unocal and its partner, Eni, have selected a development concept for the first phase of the Gendalo Field development project in the Ganal production sharing contract (PSC). Final engineering design will begin immediately and the plan of development is expected to be submitted to the government later in the year. This first phase will be designed to produce 250 -- 300 mmscfd. The project is targeted for a 2007 startup depending on government approvals. The project will target existing contract requirements for the Bontang gas market and new sales.
Gehem-Ranggas joint development planned
The Gehem discovery, made in 2003, has provided the opportunity for a joint deepwater development with the nearby Ranggas field using a common host facility. Development concept investigation and engineering are in process for the joint development. New 3-D seismic acquisition across the two fields is underway for use in the development planning. The company expects to submit a plan of development for the Gehem-Ranggas field in 2005.
Gehem & Ranggas appraisal well results
In support of the joint development, Unocal Ganal, Ltd. and Unocal Rapak, Ltd., have also completed drilling operations at the Gehem-3 and Ranggas-7 appraisal wells.
The Gehem-3 well, located in the Rapak PSC, was drilled 1.7 miles north of the Gehem-1 discovery well and 3.2 miles northwest of the Gehem-2 well. Gehem-3 was drilled in 5,744 feet of water. Drilled to a total vertical depth of 16,424 feet, the well encountered 232 feet of net gas pay and 8 feet of net oil pay. The appraisal well results indicate consistent reservoir pressure across the entire primary reservoir pool in this field and a potential single hydrocarbon pool with high-quality reservoir rock.
The Ranggas-7 well, in the Rapak PSC, was drilled to a total vertical depth of 14,402 feet in 5,394 feet of water. The well is located 4.7 miles northeast of Gehem-3. A total of 167 feet of net pay was encountered, including 52 feet of oil. Ranggas-7 was drilled to delineate the downdip and eastern limits of the primary Ranggas development area and to penetrate the deeper primary reservoir unit of the field. The appraisal well did not encounter hydrocarbons in the deeper zone. In the shallower zone, however, hydrocarbons were penetrated as far as 400 feet downdip of the Ranggas-1 well (located 0.6 miles west of Ranggas-7).
Gula appraisal well results
Earlier in 2004, additional appraisal activity was also performed on the Gula structure. The Gula-3 well was drilled 3.5 miles south of the Gula-1 discovery well. The well, located in the Ganal PSC area, was drilled in 5,990 feet of water to a total vertical depth of 17,502 feet. This total depth is more than 1,000 feet deeper than was drilled in Gula-1. Gula-3 encountered 327 feet of net gas pay and 6 feet of net oil pay.
Unocal Ganal is operator of the Ganal PSC area and Unocal Rapak is operator of the Rapak PSC area and each holds an 80-percent gross working interest under its respective PSC. Eni-Ganal, Limited, and Eni-Rapak, Limited, subsidiaries of Eni (NYSE: E), holds the remaining 20-percent gross working interest under each respective PSC.
West Seno field update
The West Seno field, operated by the company's Unocal Makassar, Ltd. subsidiary, currently has 20 completed wells, with gross production averaging 24,000 BOE per day in June, which is a 7,000 BOE per day increase from April. By year-end 2004, 26 to 28 wells are expected to be online with an expected exit rate (gross) of 25,000 to 35,000 BOE per day.
Bids were recently opened for Phase 2 development, including offshore installation and tension leg platform fabrication. The company believes that the bid results were unacceptably high. Accordingly, cost reduction options are being considered, and the construction period is expected to extend beyond 2005.
West Seno, located in the Makassar Strait PSC area, was discovered by Unocal in 1998. The field lies about 118 miles northeast of Balikpapan in water depths of approximately 3,200 feet.
Unocal Makassar operates the PSC and has a 90-percent gross working interest. Pertamina Upstream, a unit of the Indonesia state-owned oil and gas company, holds the remaining 10% gross working interest. West Seno is the first deepwater oil and gas project in Indonesia.
Most Popular Articles