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Activity - Frigate-1 Wellhead

Activity details
Organisation Bonaparte Gas & Oil Pty. Limited
Activity types Decommissioning, dismantling or removing a facility
In-force EP 6995
Submission date 28 April, 2022
Outcome Accepted
Acceptance date 26 July, 2022
Locations North West
Start date 01 November, 2022
Stop date 04 November, 2022
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Dawn McInnes
Phone: (08) 6218 7100

Activity Description
The Frigate-1 wellhead is located within the Petroleum Retention Lease WA-40-R. It is at a water depth of approximately 112m, is 101 km from the closest shoreline and 186 km from the nearest landmark, Kalumburu.

The Frigate-1 exploration well was drilled in 1978 by ARCO Australia Ltd. No hydrocarbons were encountered, and the well was plugged and abandoned in the same year.

Santos became the titleholder of WA-40-R in 2011 and is now proposing to permanently abandon the wellhead in-situ. An options assessment conducted by Santos determined that in-situ abandonment is the preferred decommissioning option based on environmental criteria.

A wellhead survey will be undertaken as part of this Environment Plan to validate the assumptions made within the options assessment. The survey may take up to 7 days, including time to locate the well. The ROV inspection of the wellhead itself is expected to take approximately 4 hours. This survey is notionally proposed to take place in September 2022.

In the event that the survey reveals an unforeseen outcome not evaluated in the options assessment, the Santos Management of Change process described in EP will be followed and Regulations 7, 8 and 17 of the OPGGS(E)R 2009 considered.
Location map (click to enlarge)
Location map - Activity: Frigate-1 Wellhead (refer to description)

Accepted EP Documents

EP Document A858030 (28.5 MB)
OPEP Document A840959 (7.31 MB)
NOPSEMA Report A857643 (101 KB)

Related EP assessments

6995 (Click to view)