The Pyrenees field is located in approximately 200 m water depth, 45 km northwest of Exmouth, offshore Western Australia. The Pyrenees block comprises five fields; Stickle, Crosby, Tanglehead, Moondyne and Ravensworth. Stickle, Crosby, Tanglehead and Moondyne are located within exploration permit block WA-42L. Ravensworth is split between WA-42L and adjacent block WA-43L. BHP Billiton is the operator both blocks.
BHP Billiton Petroleum Pty Ltd plans to increase the production from the Pyrenees Development Area with workovers of existing wells, and the installation of additional production wells.
Tie back activities will include the installation of new manifolds, flowlines, umbilicals, flying leads and risers required to route production to the Pyrenees Venture FPSO and provide control to the wells. Control system software will be updated to account for the changes.
Where required, existing wells may be suspended, disconnected and isolated from the production system. Associated infrastructure will be disconnected and stored subsea. Residual well fluids will be displaced from the flowlines using either gas or water.
Timing for the installation activities is planned to occur, subject to drilling and completions campaigns and Construction Support Vessel availability, between 2016 and 2020.