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 proposed Montebello Commonwealth Island Marine reserve.
The Woollybutt Field is presently shut-in. The scope of the EP covers passive field management activities and P&A activities (including well intervention) on four to seven wells within permit WA-25-L. Field management activities that may be undertaken in accordance with this EP include cathodic protection surveys and visual ROV inspections. The methods used by Eni are well understood and do not represent any novel techniques or equipment. ROV surveys will be conducted at least annually until the wells are plugged, and each survey is 3-7 days in duration. Only one project vessel will be in the Operational Area at any one time undertaking field management. Plug and abandonment will take approximately 20-30 days per well and will be completed within 5 years of EP acceptance. The well intervention of WB4 and WB1A may be completed prior to P&A and will take approximately 7-15 days. A maximum of three support vessels will be utilised to support the MODU during P&A activities. Only one project vessel will be in the Operational Area at any one time during well intervention activities. Project and support vessels will be selected based on the activity that will be undertaken. All vessels will be commercial vessels with a suitable survey class for activities in the Operational Area. All project vessels will run on marine diesel; no intermediate or heavy fuel oils will be used.