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

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DON-BP-001Don Field Decommissioning Programme3 Decommissioning Programme 2 - Pipelines, Flowlinesand Umbilicals3.1 GeneralPrimary Scope Activities associated with these lines will be performed irrespectiveof the final options selected for the pipelines and umbilicals.These activities, shown in Figures 6.1 and 6.2, include disconnecting andrecovering onshore: Production and water injection pipeline subsea tie-in double spoolpieces andassociated subsea isolation valves at Don manifold Untrenched sections of umbilicals at the approaches to the Don manifold Flowline and umbilical jumpers between the Don manifold and wellsAt the Thistle Installation topsides, the production and water injection pipelines, andumbilicals will be disconnected and blanked off.The options evaluated for the two 8in pipelines from the Don Field to the ThistleInstallation were as follows: Leave in situ (three methods) Leave in situ with selective recovery (recovery of pipeline ends and NLGP crossing) Full recovery (two methods)The options evaluated for the 3in chemical injection and 4in control umbilicals from theDon Field to the Thistle Installation were as follows: Leave in situ (three methods) Leave in situ with selective recovery Full recovery (two methods)Leave in situ with selected recovery was the recommended option for both the 8inpipelines and umbilicals, and includes: Cutting and recovering exposed sections of pipe (including isolation valves and waterinjection tee-piece) and umbilical at the Don manifold and Thistle approachfor disposalNote: The NLGP crossing will be left in place until the permanent decommissioningof the NLGP pipeline and the materials within the Thistle 500m zone will bedeferred until the Thistle is decommissioned Burying cut ends of pipe (cut back to stable buried pipe) and umbilical, so that there isno possibility of a snagging hazardRefer to Section 10 for further details.Removal and Disposal Options6-2 May 2011
Don Field Decommissioning ProgrammeDON-BP-001Figure 6.1Decommissioning Programme Limits – Production and Water InjectionPipelinesRemoval and Disposal OptionsMay 2011 6-3
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Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

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