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Activity - Thebe-1 Wellhead Decommissioning

Activity details
Organisation Woodside Energy Scarborough Pty Ltd
Project North West Shelf
Activity types Any other petroleum-related activity
In-force EP 6779
Submission date 11 October, 2021
Outcome Accepted
Acceptance date 01 September, 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
Daniel Clery
Phone: 0893484000

Activity Description
Woodside is planning to decommission Thebe-1 exploration well. The wellhead is located in permit WA-63-R around 300 km
north of Exmouth at a water depth of approximately 1170 m and is proposed to be left in situ.

A Decommissioning Options Assessment was performed for the Thebe-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 future trawl fishers. These impacts and risks have been
demonstrated as ALARP and acceptable in the EP.

The petroleum Activities Program will end four months after acceptance of this EP by NOPSEMA and the expected duration of the activity will
be zero days.
Location map (click to enlarge)
Location map - Activity: Thebe-1 Wellhead Decommissioning (refer to description)

Accepted EP Documents

EP Document A869486 (18.8 MB)
NOPSEMA Report A873555 (140 KB)

Related EP assessments

6779 (Click to view)