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

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Don Field Decommissioning ProgrammeDON-BP-0013.2 NLGP CrossingsThe two 8in pipelines and the two umbilicals that run between Thistle and the Donmanifold, cross the 20in NLGP pipeline approximately 15km from Thistle. Table 5.4 liststhe stabilisation inventory at this location.ItemPipelines and umbilicalscrossing stabilisationMaterialWeightin Air (tonnes)Flexiweight mattresses 65.0Grout formwork 459.0Grout bags 1368.0Rock dump 2051.0Stabilisation Total Weight 3943.0Table 5.4 NLGP Crossings Stabilisation Material Inventory3.3 JumpersThe material inventories for the flowline and umbilical jumpers connected to the Donmanifold are listed in Table 5.5.ItemFlowline JumpersWeightMaterialin Air (tonnes)Steel 2.73Composite 9.88Chemical and control jumpers Composite 3.87StabilisationEquipment Total Weight 16.48Flexiweight mattresses 42.3Grout bags 4.2Tarpaulin 0.2Stabilisation Total Weight 46.7Table 5.5 Flowline and Umbilical Jumpers Material InventoryNotes: (1)PN01 was originally connected to the Don manifold using a 4in rigidflowline jumper, which was replaced by a 4in flexible flowline jumper in1991. Vertical sections of the rigid flowline were recovered and thehorizontal section covered by a flexiweight mattress. The remaininghorizontal section, flexible and rigid tie-in pipes, and flexiweightmattresses will be removed.The replacement flexible flowline is connected to a short rigid spoolpieceat the wellhead.Inventory of MaterialsMay 2011 5-3
DON-BP-001Don Field Decommissioning Programme(2) IN03 was originally connected to the Don manifold using a 4in rigidflowline jumper, which was replaced by a 4in flexible flowline jumper in1993. Vertical sections of the rigid flowline were recovered and thehorizontal section covered by flexiweight mattresses. The remaininghorizontal section, flexible and rigid tie-in pipes, and flexiweightmattresses will be removed.The replacement 4in flexible flowline jumper is disconnected at thewellhead and at the manifold.(3) Following trawler damage in 2000 [5.2], the serviceable PN05 4inproduction flowline jumper was disconnected from the shut-in well PN05and connected to PN06 from the Don manifold and became known asPL1073. The original damaged 4in production flowline jumper PL1073became known as PL981 and was removed to shore for disposal.4 Materials on the SeabedCuttings were originally generated through drilling. A full quantitative and qualitativesurvey, performed in 1999 [5.3], estimated that the total drill cuttings volume was1763m 3 spread over a large area (47,745m 2 ).5 References[5.1] Don Pipeline System Decommissioning Technical Report, Lloyd’s RegisterEMEA, Ref No R-658-40621-1B, July 2005.[5.2] Don Field Trawl Damage Repair As-built Report, Stolt Offshore, Ref NoRE-ENG-397-303.[5.3] Don Cuttings Environmental Survey UKCS 211/18, Gardline Surveys, 5353.01,July 1999.Inventory of Materials5-4 May 2011
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Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

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