Goodwyn

Location and Geography

The Goodwyn A platform is situated in Commonwealth waters, approximately 135 km north-west of Karratha, Western Australia, and about 23 km south-west of the North Rankin A platform.

Platform and Infrastructure

• The Goodwyn A platform is a large offshore production facility, standing over 290 metres tall and secured to the seabed by 36 piles in a water depth of 131 metres. It combines production, re-injection, utilities, and accommodation facilities.
• The platform has a daily production capacity of up to 36,000 tonnes of gas and 11,000 tonnes of condensate and is designed for up to 30 production wells, including five re-injection wells.

History and Development

• The initial Goodwyn field development project began with the installation of a 17,500 metric ton steel platform jacket in the early 1990s. The platform was launched in 131 metres of water, and the construction involved the use of the Heeremac's Balder semisubmersible construction vessel.
• Production from the Goodwyn field started in October-November 1993, with initial production focused on condensate separated from the wet gas. Gas was reinjected until needed to boost gas production from the North Rankin field to fulfill existing LNG export and domestic gas contract requirements by about 1995.

Current Operations and Expansions

• The Goodwyn A platform has been operating since 1995, producing dry gas and condensate from the Goodwyn, Perseus, and Searipple area reservoirs. These fluids are transported via a network of pipelines to the Goodwyn A platform and then onshore to the Karratha Gas Plant for processing.
• The Greater Western Flank Phase 2 development, which is part of the broader Goodwyn area, involves the development of six hydrocarbon fields (Keast, Dockrell, Sculptor, Rankin, Lady Nora, and Pemberton) close to the Goodwyn A platform. This development includes subsea infrastructure and a 35km-long, 16in-diameter pipeline connecting to the Goodwyn A platform. Production from this phase began in October 2018.

Future Developments

• The Goodwyn Area Infill Development is a proposed project aimed at partially filling the unused production capacity at the existing Goodwyn A platform. This development will target both existing and previously undeveloped gas reservoirs west and south-west of the Goodwyn A platform. The project involves drilling and subsea installation in multiple phases, with the first gas expected in 2026 and decommissioning estimated around 2040.
• Geophysical and geotechnical surveys are being conducted to support the Goodwyn A infill development, plug and abandonment of decommissioned wells, and potential future exploration wells. These surveys will inform the engineering design for flowline and umbilical routes, subsea structure foundations, and other infrastructure needs.

Partners and Operators

• The North West Shelf Joint Venture (NWSJV), operated by Woodside Energy Limited, includes partners such as BHP Petroleum Pty. Ltd., BP Developments Australia Pty Ltd, Chevron Australia Pty Ltd, Japan Australia LNG (MIMI) Pty Ltd, and Shell Australia Pty Ltd.

Production and Export

• Gas and condensate produced from the Goodwyn area are transported via subsea pipelines to the Goodwyn A platform and then onshore to the Karratha Gas Plant for final processing. The processed gas is exported as LNG or used as domestic gas.

Environmental and Regulatory Aspects

• The project is subject to various environmental approvals and regulations. Public consultations and environmental impact assessments are part of the process to ensure the project complies with all regulatory requirements. For example, geophysical and geotechnical surveys are being conducted with careful planning to manage vessel movements and ensure safety exclusion zones are respected.

In summary, the Goodwyn project is a significant part of the North West Shelf gas and condensate production, with ongoing and future developments aimed at maximizing the resource potential of the area while adhering to stringent environmental and safety standards.