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

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DON-BP-001Don Field Decommissioning ProgrammeThese recovery methods are essentially the reverse of the S-lay and J-lay installationprocesses and can be achieved using dedicated lay barges. A pulling head is connectedto the end of the line for attachment of the lay vessel abandonment and recovery wire.As the lay vessel moves backwards, the recovery wire is winched in and the line liftedup onto the stinger. Once the line is in the correct position the tension is transferredfrom the winch cable to the line tensioners. The line can then be cut within the vesselinto manageable lengths and transferred either to a self-contained stockpile area or to adedicated pipe carrier vessel, located alongside, for transportation to a shore base.The difference between the S and J techniques is that the J-lay method of pipe layingwas developed and optimised primarily for deepwater applications.2.2.3 Full Recovery by Cut and LiftThis process is shown in Figure 10.4.This recovery method would not require the use of a dedicated lay vessel. The line is cuton the seabed into manageable sections and recovered to the surface using the vesselcrane for transportation to shore. There are a variety of cutting techniques available, suchas abrasive water jetting, wire or rotating cutters, explosive, thermic lance, oxy-arc orshear cutters. Several of these techniques (mostly the cold-cutting methods) have beendeveloped for remote operations subsea.Figure 10.4 Cut and Lift Method3 Items to be Decommissioned3.1 IntroductionThe pipelines, umbilicals and jumpers to be decommissioned are listed in Table 10.1 andshown in Figures 10.5 to 10.7.Pipelines10-4 May 2011
Don Field Decommissioning ProgrammeDON-BP-001Fromthe DonManifold toDECCNoDescriptionWellRefStatusThistle PL598 8in rigid pipeline N/A Filled with inhibited seawater and isolated at theThistle topsides and wellsThistle PL599 8in rigid pipeline N/A Filled with inhibited seawater and isolated at theThistle topsides and wellsThistle PL600 3in chemicalinjection umbilicalN/ABlocked and shut inThistleNotAllocated4in control umbilical N/A Subsea control inoperable. Disconnected at theThistle topsidesXmas Tree No 1 PL845 4in flexible jumper PN01 Oil production (filled with inhibited seawater andisolated at the xmas tree)4in rigid jumperIn place (disconnected at both ends)Xmas Tree No 2 PL598 4in rigid jumper PN02 Oil production (suspended and disconnected atmanifold)Xmas Tree No 3 PL599 4in flexible jumper IN03 Water injection (filled with inhibited seawater andisolated at the xmas tree)4in rigid jumperIn place (disconnected at both ends)Xmas Tree No 4 PL821 4in flexible jumper PN04 Oil production (filled with inhibited seawater andisolated at the xmas tree)Xmas Tree No 5 PL981 4in flexible jumper(refer to Note)PN05Oil production (decommissioned and recovered toshore in May 2000). Both ends (manifold andxmas tree) have been blanked off and testedXmas Tree No 6 PL1073 4in flexible jumper PN06 Oil production (suspended, filled with inhibitedseawater and isolated at the xmas tree)Xmas Tree No 6 PL1073A 1in chemicalinjection umbilicalPN06Inoperable. Umbilical disconnected at xmas treeXmas Tree No 7 PL1338 4in flexible jumper IN07 Water injection (suspended, filled with inhibitedseawater and isolated at the xmas tree)ProductionWellsNotAllocatedChemical injectionumbilicalsPN01/02/04/05Inoperable. All umbilicals disconnected at xmastreesAll WellsNotAllocatedControl umbilicalsPN01/02/04/05/06IN03/07Subsea control inoperable. PN02 and PN05jumpers removed and all other control jumpersdisconnectedNote: PL981 was decommissioned May 2000. See Appendix 10A for decommissioning correspondence with DECC.Table 10.1 List of Items to be DecommissionedPipelinesMay 2011 10-5
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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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