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Goodwyn A

Goodwyn A is an integrated fixed steel-jacket drilling, production, utilities and accommodation platform handling gas and condensate from Australia’s North West Shelf. First production began in February 1995. Installed in 131 metres of water, about 135 kilometres north-west of Karratha, it receives platform and subsea production and exports treated hydrocarbons through North Rankin A to the Karratha Gas Plant.

Operator: Woodside

Status: Operational

Goodwyn A platform photo

Production: Gas

Operations start: 1995

Water depth: 131 m

Country: Australia

Block: WA-5-L

Type: Fixed steel jacket

Field

The Goodwyn gas-condensate field lies on the Rankin Trend at the north-western edge of the Dampier Sub-basin, within the Northern Carnarvon Basin. Rich gas is trapped in fluvio-deltaic sandstone reservoirs of the Triassic Mungaroo Formation within a large rotated fault block, beneath a Cretaceous shale seal. The large field is developed through long-reach platform wells and surrounding subsea satellite tie-backs.

Facilities

Goodwyn A was designed for up to 30 wells, including five reinjection wells, and incorporates drilling, production, utilities and accommodation within an integrated topsides arrangement. The original development included long-reach, horizontal and deviated platform wells extending several kilometres from the jacket. The platform also receives production from subsea developments, including Echo–Yodel through a 23-kilometre, 12-inch pipeline and Greater Western Flank Phase 2 through an approximately 36-kilometre gathering pipeline serving four subsea drill centres. Incoming platform and subsea well fluids are processed by dedicated gas-dehydration and condensate-dewatering systems. A gas-recycling installation reinjects processed gas to support condensate recovery, while produced formation water is treated before permitted discharge. Permanent facilities also include production and test manifolds, compression, metering, chemical injection, operational and emergency flaring, drilling support, electrical generation and distribution, process control, fire-and-gas detection, emergency shutdown and accommodation. Processed gas and condensate leave Goodwyn A through the permanent subsea export connection to North Rankin A, approximately 23 kilometres north-east. At the North Rankin Complex, the Goodwyn stream is commingled with other North West Shelf production before travelling through the offshore trunkline to the Karratha Gas Plant on the Burrup Peninsula. The platform is more than 290 metres tall, weighs about 55,000 tonnes and is secured to the seabed by 36 piles, a configuration designed for the region’s cyclone environment.

Goodwyn A layout

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