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

Don Field Decommissioning ProgrammeDON-BP-001(d)(e)(f)(g)Cut out and recover sections of pipe that emerge out of the seabed back tostable buried pipe, so that there is no possibility of a snagging hazard.Remove all features from the umbilicals (umbilicals cut back and buried).Grout formwork will be left in situ and made safe for other users of the seaas demonstrated by over-trawlability trials.Remedial work to eliminate any snagging hazards.(3) Post-decommissioning activities, including surveys.The Don Owners will ensure that the site of the pipelines and umbilicals remains freefrom obstructions. This will involve a monitoring programme to confirm that the pipelinesand umbilicals remain safely buried. The method of inspection will be the mostappropriate available at the time of survey. At present, this is most likely to be a visualinspection by ROV, or by an ROV-carried sub-bottom profiler utilising acoustic pulseinduction methods.The first survey will be carried out within 1 year of completion of the decommissioningwork to provide baseline survey data and confirmation that the pipeline is not a hazard toother users of the sea. A second survey will be carried out within 3 years of the initialpost-decommissioning survey, with a future survey regime being determined inconjunction with the DECC, based on the analysis of the first two surveys.8 References[10.1] Petroleum Act 1998, http://www.hmso.gov.uk/.[10.2] DECC Guidance Notes – Decommissioning of Offshore Oil and Gas Installationsand Pipelines under the Petroleum Act 1998, http://www.decc.gov.uk/.[10.3] Don Pipeline System Decommissioning Technical Report, Lloyd’s RegisterEMEA, Ref No R-658-40621-1B July 2005.[10.4] Independent Review of BP Don Pipeline Decommissioning Options, AtkinsBoreas, Revision C, Ref No BR07028 2008.PipelinesMay 2011 10-41