Chevron has filed an environment plan (EP) with Australia’s offshore regulator for the installation of new subsea infrastructure for Gorgon Stage 2 (GS2).
Operated by Chevron, GS2 is an upgrade of the existing subsea petroleum facilities at the Gorgon Project in Western Australia, with new wells and subsea infrastructure to be added to the Gorgon and Jansz-Io fields to maintain gas supply.
Already one of the largest natural gas projects in the world with the ability to produce 15.6 million t/a of LNG, GS2 will include system upgrades on Barrow Island and the offshore installation of 11 vertical subsea production trees, more than 46 km of production pipelines, almost 29 km of control umbilicals and 2,840 t of subsea structures.
The EP submitted to the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) encompassed the installation infield flowlines, pipelines and umbilicals; subsea structures, jumpers and tie-in spools; flying leads; leak testing and pre-commissioning; field suspension; inspection, maintenance and repair; and support operations.
The Jansz-Io gas fields are located within Commonwealth Waters off the northwest coast of WA in production licenses WA-36-L, WA-39-L and WA-40-L in depths of around 1,350 m.
The Gorgon gas filed is within production licenses WA-37-L and WA-38-L and sits approximately 65 km west of Barrow Island in depths of around 200 m.
The subsea infrastructure described in Chevron’s EP will form part of pipeline licences WA-19-PL and WA-20-PL.
The project is operated by Chevron, which owns a 46.3 per cent interest in the scheme, with ExxonMobil (25 per cent), Shell (25 per cent), Osaka Gas (1.25 per cent), Tokyo Gas (1 per cent) and JERA (0.417 per cent) possessing the remaining interest.
For more information visit the Chevron website.
This article was originally published on 22 June 2020.
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