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Friday 2 nd of March 2012

Photo courtesy of Howard Johnson. Wytch Farm Field Development Project. Friday 2 nd of March 2012. TEAM B. Mohammed Alshawaf , Lanray Hammed Bakare , Francsico J. Barroso Viseras , Aristeidis Karamessinis , Ha Nguyen and Shi Su. Introduction. Cultural information

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Friday 2 nd of March 2012

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  1. Photo courtesy of Howard Johnson Wytch Farm Field Development Project Friday 2nd of March 2012 TEAM B Mohammed Alshawaf , Lanray Hammed Bakare, Francsico J. BarrosoViseras, AristeidisKaramessinis, Ha Nguyenand Shi Su

  2. Introduction • Cultural information • Location Dorset, Wessex Basin (50°69’,-1°98’) • 44 km2, onshore and offshore • Environment outstanding beauty, tourism, • wild life • Cultural information • Location Dorset, Wessex Basin (50°69’,-1°98’) • 44 km2, onshore and offshore • Environment outstanding beauty, tourism, • wild life • Geological overview • Reservoir Sherwood Sandstone • Seal Mercia Mudstone • SourceLiasFormation • Play type Tilted fault blocks • Geological overview • Reservoir Sherwood Sandstone. • Seal Mercia Mudstone • SourceLiasFormation • Play type Tilted fault blocks Wytch Farm Field Field appraisal 11.8km • Producers 1X-02, 1D-02 • Appraisal wells 3 • 3D seismic survey Google Earth, 2011 Underhill & Stoneley, 1988 Source Seal Reservoir

  3. Aims and Objectives • Develop the geological model • Investigate viable development options • Assess associated static and dynamic uncertainties • Propose a development and production plan • Justify additional data acquisition requirements Wytch Farm - Development phase - Team B

  4. Drive mechanism determination Develop model • Limitations of material balance • Oil expansion and aquifer drive are the most plausible • No assumption can be validated Investigate options N=645 MMBbl Propose plan N=300 MMBbl Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  5. Recovery mechanism Develop model Primary recovery • Low primary recovery: 4.6% => secondary recovery methods Secondary recovery • Water injection preferred • Gas injection not advised: under-saturated oil and low GOR Possibility of using artificial lift Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  6. Building the simulation model Develop model • Main assumptions • Input Fine model (2.5M cells) • Upscaled propertiesΦ, facies, Kh and Kv • Fluid model Dead oil, relative permeabilities Capillary pressure neglected for simplification purposes • Output coarse model (82,000 cells, 8 faults) Investigate options Propose plan Assess uncertainties Justify data acquisition Fine hor. permeability model - Sector Coarse hor. permeability model - Sector Coarse horizontal permeability model within Flooding event 1 Fine horizontal permeability model within Flooding event 1

  7. Upscaled model consistency Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  8. Coarse model consistency(history match) Develop model • Oil rates:good match • Water rates:calibrate the model • Limits: well history, no flow control Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  9. Development strategy Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  10. Development strategy results Develop model • 3-year plateau • Injection starts after 15 months • 345 MMBbl recoverable • 43% recovery factor based on P50 Investigate options STOIIP 795 MMBbl Recovered 345 MMBbl Propose plan Assess uncertainties Justify data acquisition

  11. Sweep efficiency analysis Develop model • Injection after 15 months • 89% sweep efficiency achievable over 25 years Investigate options Propose plan Assess uncertainties Water breakthrough Start of water injection Justify data acquisition

  12. Uncertainty analysis Develop model • Approach combines both static and dynamic parameters • Parameters considered • GRV • Porosity • Sw • kH, kV • Corey parameters • Sor, Swc, Swcr • Transmissibilities Investigate options Static properties Propose plan Dynamic properties Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  13. Reducing uncertainties Develop model Data acquisition plan • Reprocess seismic data • Coring of the first few wells SCAL • Logging • Fluid analysis Investigate options Propose plan Assess uncertainties Justify data acquisition

  14. Conclusions • High recovery factor • High sweep efficiency • Only water injection used • Good understanding of uncertainties Wytch Farm - Development phase - Team B

  15. Thank you Any questions ? Wytch Farm - Development phase - Team B

  16. Geology and upscaled properties: facies Develop model Coarse grid Fine grid Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  17. Volumetrics QC Develop model Investigate options Propose plan 2.8% 1.4% 0.8% Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  18. Upscaled properties: kh Coarse grid Develop model Fine grid Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  19. Upscaled properties: Φ Develop model Investigate options Propose plan % Porosity distribution: Fine vs Coarse grid Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  20. Cumulative production Develop model Investigate options - Fine grid Propose plan - Coarse grid Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  21. Bottom-hole pressure Develop model - Coarse grid Investigate options - Fine grid Propose plan Assess uncertainties Injectors Producers Justify data acquisition Wytch Farm - Development phase - Team B

  22. Oil saturations Coarse grid Fine grid Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  23. Sweep efficiency Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  24. Water cut Develop model Investigate options - Fine grid Propose plan - Coarse grid Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  25. Coning water Coarse grid Fine grid Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  26. Numerical diffusion Coarse grid Fine grid Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  27. History match per well Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  28. Drilling schedule Priority based on rate and rig location (two rigs: E, W) Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition

  29. Well location Well positioning based on the geology and the properties (kh) Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  30. Water injection strategy Water injection after 15 months in order to ensure pressure maintenance Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  31. Buckley-Leverett analysis Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

  32. Relative permeability analysis Develop model Investigate options Propose plan Assess uncertainties Justify data acquisition Wytch Farm - Development phase - Team B

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