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Activity - Woollybutt Field Management, Plug and Abandonment and Equipment Removal

Activity details
Organisation Eni Australia Limited
Project Woollybutt
Activity types Decommissioning, dismantling or removing a facility
In-force EP 5451
Submission date 25 November, 2020
Outcome Accepted
Acceptance date 01 July, 2021
Locations North West
Start date 28 October, 2021
Stop date 16 February, 2022
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Keith Cook
Phone: 0893201111

Activity Description
The Woollybutt Field is located approximately 80 km off the northwest coast of Western Australia in Lease Area WA-25-L. The Field is approximately 25 km west of the Barrow Island Marine Management Area and Marine Park boundary, and more than 50 km south-west of the Montebello Islands Marine Park.

The Woollybutt Field is presently shut-in. The scope of the EP covers field management activities, plug and abandonment of four to six wells, and recovery of subsea production equipment within permit WA-25-L.

Field management activities include tree cleaning, and periodic inspection surveys in accordance with the Integrity Management Plan. Each inspection survey is 7-14 days in duration. Tree cleaning takes 15-20 days and will be undertaken as a once-off campaign before P&A. Only one project vessel will be in the Operational Area at any one time during field management activities.

Plug and abandonment (P&A) will take approximately 10-30 days per well and is targeting an execution window of the H2 2021 with completion by 31 December 2021. P&A will be conducted from an Intervention Vessel/MODU, with up to three support vessels.

Following P&A, a number of subsea production equipment will be recovered, including the disconnectable single point mooring buoy, subsea structures and mid-depth gravity riser base. Equipment recovery will be undertaken within the execution window nominated for P&A. Remaining infrastructure will be maintained and subject to field management until decommissioning, which will be assessed under a separate decommissioning EP.
Location map (click to enlarge)
Location map - Activity: Woollybutt Field Management, Plug and Abandonment and Equipment Removal (refer to description)

Accepted EP Documents

EP Document A786331 (16.7 MB)
OPEP Document A786335 (6.82 MB)
NOPSEMA Report A789360 (229 KB)