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Woollybutt Field Management, Plug and Abandonment and Equipment Removal

Activity type Decommissioning, dismantling or removing a facility
Activity subtypes Drilling
Lifecycle Classification Decommissioning
Submitted by Eni Australia Limited
Submission date 25 November, 2020
Subtype Revision
Decision date 01 July, 2021
RMS ID 5451
Status Finalised
Outcome Accepted
Link to previously accepted EP 4669 - Woollybutt Field Management, Plug and Abandonment and Equipment Removal
Keith Cook
Phone: 0893201111
Location map (click to enlarge)
Location map - Activity: Woollybutt Field Management, Plug and Abandonment and Equipment Removal (refer to 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.

Other Details
Locations North West
Commonwealth waters adjacent to Western Australia
Titles (or other instruments) WA-25-L
Current Documents (Finalised)
EP Document

OPEP Document

Location map


Previous EP Documents (Under assessment)
EP Document

OPEP Document

OSMP Document

Location map