Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

Don Field Decommissioning ProgrammeDON-BP-0011 CostsThe overall total cost for the proposed Don Field Decommissioning Programme isexpected to be in the order of £150 million.The workscope covered by this overall total cost includes: Plugging and abandoning wells Removing wellheads Cleaning, flushing, hydrocarbon-freeing of pipelines and connected productionflowlines, and disconnection from wells. (Flushing, disconnection and isolation taskscompleted in 2009.) Removing all flowlines, chemical injection and control umbilical jumpers between thewells and the Don manifold Removing the Don manifold and associated pipework Removing production and water injection pipeline subsea tie-in double spoolpiecesand associated isolation valves at the Don manifold and Thistle Removing the water injection pipeline tie-in tee-piece Removing production and water injection pipeline subsea tie-in double spoolpiecesand associated isolation valves at the Don manifold and Thistle Cutting out and removing sections of pipe that emerge out of the seabed back tostable buried pipe, so that there is no possibility of a snagging hazard Removing all features from the umbilicals (umbilicals cut back and buried) Removing flexiweight mattresses and grout bags at the Don manifold and ThistleThe workscope does not include: Grout formwork along the pipelines, which will remain in situ subject to successfulover-trawlability trials Pipeline and umbilical Northern Leg Gas Pipeline (NLGP) crossings, which will bedeferred until the NLGP is decommissioned Pipebridge, risers and associated topsides equipment at Thistle, which will bedeferred until the Thistle Installation is decommissioned Drilling cuttings, which are not significantCostsMay 2011 12-1