Activity details

Organisation	Eni Australia Limited
Project	Woollybutt
Activity types	Decommissioning, dismantling or removing a facility Drilling
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
Lifecycle Classification	Decommissioning

Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact

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)

Accepted EP Documents

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

Related EP assessments

5451 (Click to view)

4669 (Click to view)

3697 (Click to view)

1996 (Click to view)