Is it necessary to install a downhole safety valve in a subsea ... - NTNU

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Is it necessary to install a downhole safety valve in a subsea oil/gas well? Table 6-2 HAZOP work sheet of the BOP handling procedure HAZOP of the BOP handling procedure ID Work Guide Possible causes Consequences Actions required Action step word by 1 1 NO The test HUB is not The BOP can not be tested Make sure the HUB is present present or does not work and is functioning 2 1 NOT The testing is not done The BOP may have failures The BOP should be tested that are not recovered before the procedure takes place 3 1 MORE The testing procedure is The workover may be Only essential functions should to extensive or lasts to unnecessarily delayed be tested on the rig, others are long tested prior to going offshore 4 2 NOT The AX-seal is not present The BOP will leak 5 2 PART A part of the AX-seal is The BOP will leak OF ruptured or scratched 6 3 NO No BOP is present on the Delayed operation Make sure that BOP placed on fork lift the forklift 7 3 MORE The forklift places the BOP has to be moved again BOP in the wrong position and the operation is delayed 8 3 MORE The BOP falls off the The BOP may not function forklift or is bumped as intended or be broken 9 4 NO The riser pipe rack is not Operation will be delayed as Check the programming of the in the right position or the rack must be moved or pipe handling system prior to the system is the pipe handling system be operation programmed wrong re-programmed Diploma thesis, NTNU 2002 48
Is it necessary to install a downhole safety valve in a subsea oil/gas well? 10 4 NO Riser pipes are not present in the time of 11 5 OTHER THAN 12 5 REVER SE operation The riser pipes are not connected; the roughneck is screwing the pipe the opposite direction. The riser pipes are not connected, they are upside down 13 5 LESS Riser is not properly connected to BOP 14 5 MORE Riser is screwed to tight to the BOP 15 5 MORE Roughneck damages the rise by holding to tight 16 5 PART OF The Riser pipe is lowered, but in the wrong position to be screwed on 17 6 LESS The riser flange dimension is too narrow to hang on drilling deck. 18 6 MORE The drilling deck does not hold the weight of the BOP. Diploma thesis, NTNU 2002 Delayed operation Make sure riser pipes are present This may lead to a delay in the operation and in worst case dropping the BOP Delayed operation and possibility dropping the BOP. The riser is not screwed properly to the BOP. The BOP may fall down Threads are damaged and may not hold the BOP as intended. BOP may fall down The riser may leak or be damaged. The riser is not connected to the BOP The riser and BOP will fall down The riser and BOP will fall down Check the programming of the iron roughneck prior to operation Make sure the riser pipes are stacked in the right direction Use instruments to measure the torque and position Use instruments to measure the torque and position Make sure the riser pipe is controlled before the pipe is lowered Use instruments to measure the position Control dimensions prior to workover and use eye control when operating Check the drilling deck for corrosion and wear 49
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Page 69 and 70: APPENDIX A A1 Subsea production sys
Page 71 and 72: A1.3 Well completion A1.3.1 Tubing
Page 73 and 74: A1.5.2 Guidelineless system Several
Page 75 and 76: Appendix B In this appendix a figur
Page 77 and 78: Appendix C Fault trees constructed
Page 79 and 80: Production Wing valve ITL WV Produc
Page 81 and 82: Component: Production Packer Failur
Page 83 and 84: Reliability data dossier Component:
Page 85 and 86: Component: Production wing valve Fa
Page 87 and 88: Component: Crossover line Failure r
Page 89: Appendix F The guide-words used in
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Is it necessary to install a downhole safety valve in a subsea ... - NTNU

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