Activity details

Organisation	Woodside Energy Ltd
Project	North West Shelf
Activity types	Any other petroleum-related activity
In-force EP	6777
Submission date	08 October, 2021
Outcome	Accepted
Acceptance date	21 July, 2022
Locations	North West
Start date	Pending titleholder notification
Stop date	Pending titleholder notification
Lifecycle Classification	Decommissioning

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

Titleholder contact

Activity Description

Woodside is planning to decommission Calthorpe-1 exploration well. The wellhead is located in permit WA-59-L around 50 km north of Exmouth at a water depth of approximately 820 m and is proposed to be left in situ. A Decommissioning Options Assessment was performed for the Calthorpe-1 well which compared removal of the wellhead to leaving it in situ. The assessment found that the leave in situ decommissioning option was preferred as it meets legislative requirements, is technically feasible, provides equal environmental outcomes, and has fewer health and safety risks when compared to removal. Impacts associated with the perpetual presence of the wellhead include long-term degradation of the wellhead material and potential displacement or interactions with current or future trawl fishers. These impacts and risks have been demonstrated as ALARP and acceptable in the EP. The petroleum Activities Program will end on acceptance of this EP by NOPSEMA and the expected duration of the activity will be zero days.

Location map (click to enlarge)

Accepted EP Documents

EP Document	A854322 (25.4 MB)
NOPSEMA Report	A870381 (131 KB)

Related EP assessments

6777 (Click to view)