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).
