Installation of Unocal Indonesia Ltd.'s Serang field platform off East Kalimantan, Indonesia, last fall marked a record water depth for a platform off Indonesia.
Unocal started production from the Serang SA drilling production wellhead platform late last year (OGJ, Dec. 27, 1993, p. 34).
PT Gema SemBrown (GSB), Jakarta, completed the $40 million turnkey, fast track project for Unocal. GSB is jointly owned by Brown & Root Energy Services, Houston, Sembawang Engineering, Singapore, and Indonesian partner Fadel Muhammad. GSB completed platform fabrication at its Sunda Straits fabrication yard (SSFY) in West Java.
The platform was installed in 335 ft of water in Makassar Strait 25 miles off East Kalimantan. Installation was complete in late September 1993, and the project was commissioned Nov. 9, 1993. Production of oil and gas started Nov. 19, reached 5,600 b/d by yearend 1993, and is expected to build to 15,000 b/d this year.
PLATFORM INSTALLATION
The Serang jacket was loaded out in late July and installed in August. The Serang deck sections were installed Sept. 10 followed by an intensive hookup program. The four leg, 20 well slot platform has a combined weight of 4,230 tons broken out as 1,755 tons for the jacket, 1,050 tons for the deck, and 1,425 tons for the piling.
The turnkey project included design, procurement, fabricate and installation of the Serang jacket, deck, and piling. Mechanical completion was achieved Oct. 26.
OPI, under subcontract to GSB, used its derrick/pipelay barge DLB 264 to install the Serang cellar and main deck structures in two lifts. The DLB 264 also installed the Serang jacket and laid two Serang export trunklines, connecting Serang SA with Unocal's Melahin field. Oil and gas production from the Serang field will reach landfall at Santan, East Kalimantan.
Last summer, SSFY completed fabrication and loadout of Unocal's Attaka L jacket and deck. Concurrently with the Serang project, OPI installed and hooked up the four pile, 20 slot Attaka L drilling/production platform and associated pipelines. Unocal Indonesia produced first oil and gas from Attaka L on Oct. 15, 1993.
Copyright 1994 Oil & Gas Journal. All Rights Reserved.
