Greater Western Flank Phase 2

Project Overview

The Greater Western Flank Phase 2 (GWF-2) project is an oil and gas development located offshore on the North West Shelf of Western Australia. Here is a comprehensive profile of the project:

Location

The project is situated approximately 175km north-west of Dampier, offshore Western Australia, in Commonwealth waters. The specific coordinates are around -19.7867, 115.7811.

Operator and Ownership

The project is operated by Woodside Energy on behalf of a joint venture consisting of six partners:

• BHP Billiton Petroleum
• BP Developments Australia
• Chevron Australia
• Japan Australia LNG (MIMI)
• Shell Australia Each partner holds an equal stake of approximately 16.67% in the project.

Fields Developed

The GWF-2 project involves the development of six hydrocarbon fields:

• Keast
• Dockrell
• Sculptor
• Rankin
• Lady Nora
• Pemberton These fields are located within production licences WA-5-L, WA-6-L, WA-24-L, and WA-51-R.

Infrastructure and Development

• Subsea Infrastructure: The project includes subsea infrastructure, such as a 35km-long, 16-inch diameter pipeline connecting the furthest well center (Lady Nora and Pemberton) to the existing Goodwyn A platform.
• Umbilicals and Manifolds: A 33.4km subsea umbilical was laid, and four manifolds were installed at the Lady Nora, Sculptor/Rankin, and Keast/Dockrell fields.
• Wells: Eight natural gas production wells were drilled across the six fields. Drilling activities were conducted in two campaigns, with the first five wells starting production in the Lady Nora, Pemberton, Sculptor, and Rankin fields, followed by the remaining three wells.
• Pipeline Installation: The pipeline installation work was completed in September 2018 by McDermott International.

Production and Reserves

• Gas Reserves: The project is expected to produce 1.6 trillion cubic feet (tcf) of raw gas.
• Condensate Reserves: Approximately 43 million barrels of condensate are expected to be produced.
• Production Start: Production from the development began in October 2018.

Contractors and Services

• Front-End Engineering Design (FEED): Wood Group Kenny was awarded the FEED contract for the flowline system and associated procurement support.
• Subsea Systems: FMC Technologies provided subsea production trees, wellheads, manifolds, and flowline connection systems.
• Installation and Transportation: Subsea7 was involved in the transportation and installation of subsea umbilicals and manifolds. McDermott International completed the pipeline installation.

Timeline

• Approval: The project received approval in December 2015.
• Drilling: Offshore drilling began in the second half of 2016.
• Installation and Commissioning: The installation of the 35km flowline and subsea infrastructure was completed in approximately seven months, with commissioning completed in five months. The pipeline installation work was finished in September 2018.

Investment

The total investment in the project was approximately $630 million.

Environmental and Operational Context

• Water Depth: The fields are located in water depths ranging from 79m to 130m.
• Safety Initiatives: The project involved the implementation of innovative safety initiatives, structured training, and a culture of safety leadership.

The Greater Western Flank Phase 2 project is a significant development in the North West Shelf project, ensuring continued gas supply to the existing Goodwyn A platform and supporting the production of LNG and domestic gas.