Location of Repository

Decommissioning of offshore oil and gas facilities: a comparative assessment of different scenarios

By Paul Ekins, Robin Vanner and James Firebrace

Abstract

A material and energy flow analysis, with corresponding financial flows, was carried out for different decommissioning scenarios for the different elements of an offshore oil and gas structure. A comparative assessment was made of the non-financial (especially environmental) outcomes of the different scenarios, with the reference scenario being to leave all structures in situ, while other scenarios envisaged leaving them on the seabed or removing them to shore for recycling and disposal. The costs of each scenario, when compared with the reference scenario, give an implicit valuation of the non-financial outcomes (e.g. environmental improvements), should that scenario be adopted by society. The paper concludes that it is not clear that the removal of the topsides and jackets of large steel structures to shore, as currently required by regulations, is environmentally justified; that concrete structures should certainly be left in place; and that leaving footings, cuttings and pipelines in place, with subsequent monitoring, would also be justified unless very large values were placed by society on a clear seabed and trawling access

Topics: UOW12
OAI identifier: oai:westminsterresearch.wmin.ac.uk:2030
Provided by: WestminsterResearch

Suggested articles

Preview

Citations

  1. (2002). A Handbook of Industrial Ecology: Material flows due to mining and urbanization, Ian Douglas and Nigel Lawson, Edward Elgar,
  2. (1995). An assessment of the environmental impacts of decommissioning options for oil and gas installations in the north sea, Report produced for UKOOA.
  3. (2001). and Safety Executive
  4. (2003). Bremen Statement’, following the Ministerial Meeting of the OSPAR Commission,
  5. (2004). Commission on Environmental Pollution
  6. (2005). Decommissioning Scenarios: A Comparative Assessment Using Flow Analysis, PSI Working Paper, Policy Studies Institute,
  7. (2000). Determination of the Physical Characteristics of Cuttings Piles, using Existing Survey Data and Drilling Information,
  8. (2001). Economic aspects of Field Decommissioning in the UKCS,
  9. (2000). Economic Growth and Environmental Sustainability: The Prospects for Green Growth, Routledge, London and
  10. (1999). Ekofisk I disposal:Impact Assessment Environmental and Societal Impacts,
  11. (2002). Energy – its impact on the environment and society, Annex 2A: Decommissioning of offshore oil and gas installations,
  12. (2002). Final Report of the Scientific Review Group’,
  13. forthcoming ‘Benefits Beyond Boundaries: the Fishery Effects of Marine Reserves’, Trends in Ecology and Evolution
  14. (2000). Guidelines for the Calculation of Estimates of Energy use and Gaseous Emissions in the Decommissioning of offshore structures, The Institute of Petroleum,
  15. (2000). Local Authority Waste Management Costs Study, Enviros Aspinwall Scottish Executive Central Research Unit
  16. (1999). Maureen Decommissioning Programme, Section 2, Executive Summary,
  17. (2000). Muddied Waters: A Survey of Offshore Oilfield Drilling Wastes and Disposal Techniques to Reduce the Ecological Impact of Sea Dumping, for Ekologicheskaya Vahkta Sakhalina (Sakhalin Environment Watch),
  18. (2003). of Trade and Industry
  19. (2004). Offshore Operators Association
  20. Offshore Operators Association) 1999, Industry guidelines on: A framework for risk related decision support,
  21. (2002). Parliament approves in-place disposal of Ekofisk Tank’, Epoke, Information on the Ekofisk I Cessation project, www.phillips.no/cessation,
  22. (2000). Quality Status Report 2000: Region II Greater North Sea, OSPAR Commission,
  23. (2004). Report of the Independent Review Group (IRG)’, Case Study A Decommissioning Project, April,
  24. (1992). The Convention for the Protection of the Marine Environment of the North-East
  25. (2005). The End of Brent Spar’ http://www.uyseg.org/risked/pages/spar/spar_index.htm, accessed
  26. (2001). The Environment and the Decommissioning of Offshore Installations’,
  27. (2004). The Role of Science
  28. (2002). UKOOA Drill Cuttings Initiative: Final Report,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.