The company advised that the Nganhurra operations cessation environment plan (EP) was revised and resubmitted on December 20, 2019 to address alternatives for the removal of the riser turret mooring (RTM) from the field for onshore disposal.
Following stakeholder consultation, Woodside elected to withdraw the EP and submit a new revision, which involves a more comprehensive evaluation of the impacts and risks associated with repurposing the RTM into an integrated artificial reef (IAR).
The company outlined in its EP that the RTM removal would be completed between March and April this year and is estimated to take 30 days.
“Exact commencement and activity duration will be dependent on weather, vessel availability, regulatory approvals and any unforeseen circumstances. If unable to meet this commencement window, the activities will be undertaken between December 2021 and March 2022,” Woodside reported in its EP.
In 2018, the Nganhurra floating production, storage and offtake facility (FPSO) was utilised to flush, isolate and preserve the RTM and the subsea infrastructure, before the FPSO was disconnected and removed from the Enfield field (WA-28-L).
Woodside reported that the reservoir, located 50km north-north-west of Exmouth, had reached the end of its field life.
Production ceased at midnight on November 7, 2018, and the process of disconnecting the FPSO facility from the field began.
On December 5 2018, it was officially disconnected and sailed away for the last time after a13-year stint over the Enfield oil field.
Nganhurra was built in the Samsung shipyards on Geoje Island, South Korea, in 2006 and produced more than 80 million barrels.