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Activity - Gorgon Gas Development Pipeline and Subsea Infrastructure Installation and Pre-Commissioning

Activity details
Organisation Chevron Australia Pty Ltd
Project Gorgon
Activity types Significant modification of a petroleum pipeline
Any other petroleum-related activity
In-force EP 5285
Submission date 09 June, 2020
Outcome Accepted
Acceptance date 10 November, 2020
Locations North West
Start date 08 October, 2021
Stop date 12 May, 2022
Lifecycle Classification Development
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Shane Waldeck
Phone: 08 9216 4000

Activity Description
Chevron Australia Pty Ltd (CAPL), on behalf of the Gorgon Joint Venturers developed the Gorgon Foundation Project (GFP), which included the construction of a Liquified Natural Gas Plant (LNG Plant) and domestic gas plant on Barrow Island. To maintain gas supply, CAPL plans to expand the subsea gathering network within the existing Gorgon and Jansz–Io fields.

This EP addresses the installation of subsea infrastructure associated with the Gorgon Stage 2 (GS2) Project in Commonwealth Waters, except for production well construction, tubing head spools, and Christmas tree installation. Installation of subsea infrastructure includes these primary activities:
• installation of infield flowlines, pipelines, and umbilicals
• installation of subsea structures, jumpers, and tie-in spools
• installation of flying leads
• leak testing and pre-commissioning
• field suspension
• inspection, maintenance, and repair (IMR) (before start-up and operations commence)
• support operations.

The Jansz–Io gas fields are located within production licenses WA‐36‐L, WA‐39‐L and WA‐40‐L approximately 200 km off the north‐west coast of Western Australia in water depths of approximately 1,350 m. The Gorgon gas field is located within production Licences WA‐37‐L and WA‐38‐L, approximately 130 km off the north‐west coast of Western Australia, and 65 km north‐west of Barrow Island in water depths of approximately 200 m. The subsea infrastructure described in this EP will form part of pipeline licences WA‐19‐PL and WA‐20‐PL in Commonwealth Waters.

The earliest date of commencement of the installation campaign is Q4 2020. Activities will be conducted 24 hours per day, seven days per week.
Location map (click to enlarge)
Location map - Activity: Gorgon Gas Development Pipeline and Subsea Infrastructure Installation and Pre-Commissioning (refer to description)

Accepted EP Documents

EP Document A754414 (6.29 MB)
OPEP Document A748691 (2.47 MB)
OSMP Document A734611 (9.99 MB)
Appendices A748692 (2.14 MB)