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? 9 Appendices Appendix A: Introduction to a subsea production system Appendix B: The production well Appendix C The fault trees Appendix D: Reliability data dossiers Appendix E: The basic steps of a HAZOP procedure Appendix F: Diploma thesis, NTNU 2002 HAZOP guide-words 58
APPENDIX A A1 Subsea production system This appendix is based on information found in references [5, 6, 12, 21]. The appendix is included to provide a basis of understanding of a subsea production system and the different hardware components included. A production system is essentially a system that provides transportation of fluids from the reservoir to the surface and separates it into oil, gas and water. The oil and gas streams are transported from the field and prepared for sale. The water is treated and injected to the reservoir or brought to disposal. A production system consists of different groups of mechanical elements. Subsea system components are normally exposed directly to the sea. The installation and maintenance operations are carried out by specially designed manipulators, remote operated vehicles (ROV), conventional divers, drill string from a vessel, or by recovering components to the surface. A1.1 Natural flow production well Production from a natural flow well is probably the most common method of oil production. Figure A-1 shows a naturally flowing production well. To be able to produce fluid from this well different components are required. The main components relevant for a natural flow subsea well are: 1. Casings 2. Tubing string 3. Production packer 4. Downhole Safety Valve (DHSV) 5. Subsea wellhead 6. Subsea x-mas tree 7. Control system A-1
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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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