Subsea Installation for Offshore Gas Development

Subsea7 has secured a contract from Chevron Australia to deliver subsea installation services for the Gorgon Stage 3 (GS3) project, located offshore Australia in deepwater conditions.

Scope of subsea engineering and installation
The contract covers a full range of subsea activities, including project management, engineering, procurement, fabrication, transportation, installation, and pre-commissioning of subsea equipment and associated infrastructure. The work will be executed at a water depth of approximately 1,350 meters, placing the project within the deepwater segment of offshore gas development.

Such scope integration is typical for large offshore developments, where coordinated execution across engineering and installation phases is required to manage technical complexity and reduce interface risk.

Project execution and timelines
Project management and engineering activities will begin immediately from Subsea7’s Perth office, supported by engineering teams in Kuala Lumpur, Malaysia, and Paris, France. This multi-location execution model reflects the scale of the GS3 project and the need for specialized engineering resources across regions.

Offshore installation activities are currently scheduled to take place in 2028, aligning with Chevron’s phased development plan for the Gorgon field.

Technical context of Gorgon Stage 3
The Gorgon project is one of Australia’s largest offshore gas developments, and Stage 3 represents a continuation of subsea tiebacks and infrastructure additions to sustain production. Operating at significant water depth introduces challenges related to installation tolerances, equipment handling, and subsea system integration.

Subsea installation and pre-commissioning at this depth typically involve remotely operated vehicles (ROVs), deepwater installation vessels, and stringent quality controls to ensure long-term integrity and flow assurance.

Role within offshore energy development
Deepwater subsea projects remain a critical component of global gas supply, particularly where existing offshore infrastructure can be extended through additional subsea installations. By leveraging established fields and processing facilities, operators can manage development costs while accessing remaining reserves.

Within this context, the GS3 contract illustrates the continued role of subsea engineering and construction in extending the productive life of large offshore assets.