Gudgeon-1 and Terakihi-1 Plug and Abandonment
|Activity type||Decommissioning, dismantling or removing a facility|
|Submitted by||Esso Australia Resources Pty Ltd|
|Submission date||19 December, 2022|
|Status||Under assessment (with titleholder)|
|Link to previously accepted EP|
The P&A campaign will utilise the Helix Q7000 LWIV to P&A the Gudgeon-1 and Terakihi-1 subsea wells. The two wells will be permanently abandoned by installation of cement plugs as barriers, followed by the retrieval of wellheads from the seafloor. This campaign will eliminate loss of containment risks and will remove obstructions and snag points for commercial fishermen. The P&A campaign will take place in Production Licences VIC/L06 and VIC/L20 located at the edge of the Gippsland Basin of the eastern Bass Strait, and adjacent to the Bass Canyon system.
The Gudgeon-1 and Terakihi-1 wells are about 7 kilometres apart and lie just outside the Bass Strait Area To Be Avoided (ATBA) and in the pathway of the International Maritime Organisation (IMO) recognized Bass Strait Traffic Separation Scheme (TSS). There is a requirement to re-establish ‘temporary fairways’ around the facilities during P&A activities, in collaboration with the Australian Maritime Safety Authority (AMSA).
The earliest date of commencement of the P&A program is third quarter 2023, with all activity scheduled to be completed during fourth quarter, 2023. Activities will be conducted 24 hours per day, seven days per week. It is expected to take approximately 30 days per well to complete P&A activities, inclusive of LWIV positioning activities, dependent on weather, scheduling and well conditions.