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Activity - BassGas Operations

Activity details
Organisation Beach Energy (Operations) Limited
Project BassGas
Activity types Operation of a facility for the recovery or processing of petroleum
Operation of a petroleum pipeline
In-force EP 4987
Submission date 20 September, 2019
Outcome Accepted
Acceptance date 23 December, 2020
Locations Tasmania
Start date 04 February, 2024
Stop date Pending titleholder notification
Lifecycle Classification Operation & Production
Please note: activity start and stop dates are based on notifications provided by the titleholder.

Titleholder contact
Philip Wemyss
Phone: 08 8338 2833

Activity Description
Beach Energy (Operations) Ltd is the operator of the BassGas Development which produces gas and liquids from the Yolla gas field located in Bass Strait, 147 km south of Kilcunda, Victoria. Dehydrated gas and condensate are transported to the Lang Lang Gas Plant via a subsea pipeline to the Victorian mainland with a coastal crossing near Kilcunda.

The scope of the BassGas operations (the ‘petroleum activity’) is defined as the operation and maintenance for the next five years of the:
• Yolla-A manned platform (in Production Licence T/L1);
• Yolla-3, -4, -5 and -6 wells, and;
• Subsea raw gas pipeline (in Pipeline Licences T/PL2 and VIC/PL34).

The Yolla-A platform located in a water depth of 80 m is a four-legged tubular steel jacket, integrated into a gravity base structure that has a footprint of approximately 50 m x 50 m. The reservoir fluid produced to surface (raw gas) by the four Yolla wells consists of hydrocarbon gas and liquids, condensed water vapour and formation water.

Ongoing offshore inspection and maintenance activities for the BassGas Development include:
• Platform topsides cleaning, inspection, repairs and maintenance;
• Vessel-based remotely operated vehicle (ROV) pipeline inspections;
• Diving activities to conduct inspections, maintenance and repairs;
• Pipeline pigging;
• Pipeline stabilisation and span rectifications; and
• Geophysical surveys along the pipeline

A platform supply vessel visits the Yolla-A platform approximately once per month during normal staffing. The BassGas Development commenced production in 2006 and the end of field life for Yolla is anticipated to be the end of 2025 based on current production (i.e. assuming no infill drilling in the Yolla field or connection of other wells).
Location map (click to enlarge)
Location map - Activity: BassGas Operations (refer to description)

Accepted EP Documents

EP Document A759606 (14.8 MB)
OPEP Document A759018 (3.21 MB)
OSMP Document A759020 (892 KB)
NOPSEMA Report A762914 (211 KB)
Appendices A759017 (55 MB)