Activity details

Organisation	Jadestone Energy (Eagle) Pty Ltd
Project
Activity types	Any other petroleum-related activity
In-force EP	8531
Submission date	10 October, 2025
Outcome	Accepted
Acceptance date	16 April, 2026
Locations	Ashmore Cartier
Start date	29 July, 2024
Stop date	Pending titleholder notification
Lifecycle Classification	Development

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

Titleholder contact

Activity Description

Jadestone Energy (Eagle) Pty Ltd (Jadestone Energy) plans to continue monitoring of two temporarily abandoned wellheads, Sea Eagle-1 and Tahbilk-1, in the Montara field via vessel-based activities. Sea Eagle-1 was drilled and subsequently suspended in 2008, and Tahbilk-1 in 1990. To date a remote monitoring system has been installed on the wells and is this may require maintenance over the life of the EP. This would be conducted via ROV Surveillance. This EP describes the inspection and maintenance activities on the wells. Sea Eagle-1 is within Production Licence AC/L8 and Tahbilk-1 is within production Licence AC/L7 within the Montara field which lies approximately 690 km (373 nautical miles) east of Darwin in a water depth of approximately 80 m in Commonwealth waters of the Timor Sea. Following a recent well integrity review, the potential for a loss of well control during suspension has been assessed as not credible and has therefore been removed from the Environment Plan (EP). The revised worst-case spill scenario is now limited to a diesel release from a vessel collision, which has resulted in a substantial reduction in the Environment that May Be Affected (EMBA). This has triggered a revision in part to the EP in 2025 and updates have been undertaken pertaining to the change in EMBA, including the existing environment, spill response activities and consultation. This also includes an updated OPEP to reflect this change.

Location map (click to enlarge)

Accepted EP Documents

EP Document	A1326585 (38.7 MB)
OPEP Document	A1326593 (3.45 MB)

Related EP assessments

8531 (Click to view)

6755 (Click to view)