As Operator of the North West Shelf Joint Venture (NWSJV), Woodside Energy Limited (Woodside) proposes to undertake the Goodwyn Area Infill Development. The development will partially fill ullage (unused production capacity) at the existing Goodwyn A (GWA) platform.

The proposed Goodwyn Area Infill Development comprises multiple subsea tiebacks to the existing Greater Western Flank (GWF) subsea infrastructure, which will transfer the reservoir fluids to the existing GWA platform. The development will target both existing and previously undeveloped gas reservoirs west and south-west of the GWA platform in Commonwealth waters. The Project Area involves drilling up to 8 production wells and subsea installation in Woodside petroleum titles, WA-5-L, WA-24-L, WA-23-L, WA-7-R, WA-6-L, WA-23-L, WA-56-L, WA-57-L, WA-58-L. The Project Area, at its closest is ~30 km north of the Montebello Islands and ~140 km northwest from Karratha.

The Goodwyn Area Infill Development is a phased development, with construction (drilling of production wells and installation of subsea infrastructure) and start-up of operations occurring over multiple phases. The initial phase of development is currently planned to start during 2027 (noting that anchoring activities may commence in 2026), with first gas planned in 2027. Achieving these milestones is subject to several factors being finalised, including NWSJV approvals, regulatory approvals, and commercial arrangements.

The proposed phased activities include:
• Drilling and completions: geotechnical sampling, drilling operations, formation evaluation, well completion, well unloading
• Subsea installation and pre-commissioning: installing Xmas trees, flowlines, electrohydraulic umbilicals, and other infield infrastructure and pre-commissioning
• Start-up and operations: initial start-up of wells and subsea infrastructure and subsea inspection, monitoring, maintenance and repair (IMMR)
• Field support activities including operating Mobile Operating Drilling Units (MODU), vessels, helicopters, and Remotely Operated Vehicles (ROV)
• Decommissioning: plugging and abandoning wells and removing infrastructure

This Offshore Project Proposal (OPP) does not include the existing operations of the GWA facility and North West Shelf Project. These facilities are operating under existing environmental approvals.