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Anette Poulsen, Chevron Upstream Europe, Aberdeen, Scotland September 2009

Chemical EOR Implementation for the Captain Field, UK 30 th IEA EOR Symposium and Workshop September 2009. Anette Poulsen, Chevron Upstream Europe, Aberdeen, Scotland September 2009. Outline. Background Project Definition Strategy Pilot Objectives and Deliverables.

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Anette Poulsen, Chevron Upstream Europe, Aberdeen, Scotland September 2009

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  1. Chemical EOR Implementation for the Captain Field, UK30th IEA EOR Symposium and WorkshopSeptember 2009 Anette Poulsen, Chevron Upstream Europe, Aberdeen, Scotland September 2009

  2. Outline • Background • Project Definition • Strategy • Pilot Objectives and Deliverables

  3. Captain Field Location • Location: • Block 13/22a, UK North Sea. • First Oil 1997: • 12 years production history • Current gross oil production: • 40,000 bbls/ day. • Equity: • 85% • 15%

  4. Captain Development • Discovered 1977 • Early development challenges • Multiple platforms and over 300 vertical wells! • Early 1990ies technology advances • Horizontal drilling and ESP development • Successful EWT – 1993 • 1997 installed WPP & FPSO, first oil • 2000 expansion project: BLP and subsea Area B template installed • 2006 Captain Area C - further 2 subsea well development 4km east of Area B template • Polymer injection facilities installed as part of original development

  5. Captain Infrastructure

  6. Captain Reservoir X-Section Area C Manifold Far East Burns Ross East 2km 0 Area A WPP Area B Template Upper Captain Sandstone Southern Terrace Area A Gas Cap Eastern Extension -2500’ Captain Ridge GOC -2723 GOC -2799 S-UCS UCS UCS UCS LCS LCS LCS LCS East OWC -2982 OWC -2921 OWC -2992 -3000’ Lower Captain Sandstone Ross OWC -3028 Wick Devonian OWC -3251 West Ross Ross Central -3500’ Ross Sandstone Upper Captain Sandstone : Sheet-like deepwater sandstone, Lower Captain Sandstone : Channelised deepwater sandstone, Ross/Burns Sandstone : Fluvial/ shallow marine sandstone.

  7. Captain Waterflood Performance • Volumetric sweep • Injection water slumps down, under-running oil column • Water cones up to producers from OWC or under-running water • Significant hydrocarbon volumes by-passed • Microscopic sweep • Poor SCAL data (unconsolidated rock) • Large uncertainty in ROS and Sorw

  8. Outline • Background • Project Definition • Strategy • Pilot Objectives and Deliverables

  9. Captain Long Term Development Project

  10. Long Term Development Sub-Projects – Chemical EOR • Positives • Exceptionally high permeability • Low temperature, moderate salinity • Medium to high oil acidity • Challenges • Heavy/viscous oil • High hardness (Ca, Mg ions in formation water) • Offshore (impact on facilities, brown field modifications) • Key Issues • Incremental sweep • Chemical compatibility and chemical performance • Offshore space/weight/POB constraints • Existing equipment suitability/conditions

  11. Project Definition • Opportunity Statement: • To develop an integrated Chemical EOR Field and Reservoir strategy and timely implementation plans to increase ultimate recovery in order to develop P4–P6 resources into the proved developed reserves category. • Success Vision: • Economically implement chemical EOR in Captain to achieve at least 50% recovery factor in all reservoirs where chemical EOR will be applied

  12. Impact on Life of Field

  13. Outline • Background • Project Definition • Strategy • Pilot Objectives and Deliverables

  14. EOR Strategy • Evaluate suitable chemicals (polymer and ASP) for Captain • Implement pilot polymer flood project using existing equipment on the Captain facilities • Follow by ASP flood if viable • Develop reliable forecasting tools and evaluate full field implementation • Implement EOR scheme on Captain

  15. Outline • Background • Project Definition • Strategy • Pilot Objectives and Deliverables

  16. Pilot Objectives • Demonstrate polymer flood technical feasibility in Captain field • Early identification of potential showstoppers • Provide data to evaluate economic viability for further expansion • Reduce range on key uncertainties • Meet above objectives within desired timeframe

  17. Key Uncertainties • Ability to ship, mix, filter and inject polymer offshore, in the North Sea • Well injectivity • Increase in sweep efficiency, oil cut and oil production rate • Chemical usage • Impact on production efficiency • Operability of facility

  18. Pilot Strategy Table

  19. Project Milestones Water injection baseline 4Q09

  20. The Last Slide

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