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

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DON-BP-001Don Field Decommissioning Programme3.6 NLGP CrossingsApproximately 2km from the Don manifold, the two 8in pipelines and the two umbilicalsemerge from their trenches to cross over the 20in Northern Leg Gas Pipeline (NLGP),which is laid on the seabed.Stabilisation of the pipelines and umbilicals is provided by a combination of GlassReinforced Plastic (GRP) protection covers (8in pipelines only), flexiweight mattresses,grout formworks, grout bags and rock dump (refer to Figures 10.11 and 10.12).Figure 10.11 Pipelines and Umbilicals Layout at NLGP CrossingsFigure 10.12 Cross-section of Pipelines/Umbilicals at NLGP CrossingsPipelines10-12 May 2011
Don Field Decommissioning ProgrammeDON-BP-0013.7 Production and Water Injection Flowline JumpersThe Don Field includes five oil production and two water injection wells. These wells aretied back to the Don manifold using 4in rigid and flexible flowline jumpers, as shown inFigure 10.13.All flowline jumpers contain either raw or inhibited seawater and are disconnected at oneor both ends.Figure 10.13 Don Field Flowline and Umbilical Jumpers3.8 Control and Chemical Injection JumpersControl umbilical jumpers were connected between the Don manifold and eachwellhead. PN02 and PN05 control jumpers have been removed and all other controljumpers disconnected.The chemical injection system has been inoperable since 1995. The jumpers have beendisconnected at the wells and may contain scale inhibitor, corrosion inhibitor, demulsifierand methanol.Jumpers are routed on the seabed with flexiweight mattresses used for stabilisation,where necessary.3.9 Protection and Stabilisation FeaturesThe Don pipeline system uses flexiweight mattresses, grout formworks and grout bagsand rock dump protection features. The majority of these are on the NLGP crossing andat the Don Manifold area.PipelinesMay 2011 10-13
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Executive SummaryMay 2011 2-5Table
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Descriptions of Items to be Decommi
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Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

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