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Torsten Clemens, Joop de Kok, Yannick Yanze

Rejuvenation of a mature oil field: Underground Gas Storage and Enhanced Oil Recovery, Schönkirchen Tief Field, Austria IEA-EOR Conference 2009. Torsten Clemens, Joop de Kok, Yannick Yanze. Gas supply shortage in 2008. Outline. Reservoir overview

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Torsten Clemens, Joop de Kok, Yannick Yanze

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  1. Rejuvenation of a mature oil field: Underground Gas Storage and Enhanced Oil Recovery, Schönkirchen Tief Field, AustriaIEA-EOR Conference 2009 Torsten Clemens, Joop de Kok, Yannick Yanze

  2. Gas supply shortage in 2008

  3. Outline • Reservoir overview • Concept Underground Gas Storage (UGS) + Enhanced Oil Recovery (EOR) • Simulation setup • Optimization of UGS • Dewatering • Cycling • EOR • Conclusions

  4. Reservoir overview • Highly fractured dolomite • Water- to mixed wet • 19 mn Sm3 STOIIP • GOC at 2550 mss • OWC 2740 mss • Producing since 1962 • Current recovery factor 59 % • Water flooded

  5. Historical production – initial conditions

  6. Historical production – initial oil production phase

  7. Historical production – initial oil production phase

  8. Historical production – perforation higher

  9. Historical production – water injection

  10. Historical production – current conditions

  11. Historical production – current conditions Sorw = 25%

  12. Underground Gas Storage & EOR - fractures

  13. Underground Gas Storage & EOR - fractures

  14. Underground Gas Storage & EOR - fractures

  15. Underground Gas Storage & EOR - matrix Sorg = 15% Sorw = 25%

  16. Simulation setup • Is it possible to build up the required volumes of gas? • How long does it take to build up the UGS? • Is dewatering required? • How much cushion gas is required to safely produce the gas volumes? • How many wells are necessary to inject and produce the required gas volumes? • Where to place the injection / production wells? • What are the risks and uncertainties? • Is there any EOR potential? • Is there an opportunity to accelerate current production?

  17. Matrix grid Fracture grid km, fm kf, ff, σ input properties fracture-fracture exchanges matrix-fracture exchanges unknowns Pm, Sm Pf, Sf matrix-matrix exchanges Simulation setup Dual-permeability approach: two superimposed grids

  18. History match • Multiple history matches • Multiple predictions

  19. Optimization of UGS – phased approach 3 Phase 1 2 Total injected gas [billion m³] 1 0 0.5 2.5 5.5 Time in years

  20. Optimization of UGS – phased approach 3 Phase 1 Monitoring phase 2 Total injected gas [billion m³] 1 0 0.5 2.5 5.5 Time in years

  21. Optimization of UGS – phased approach Phase 2 3 Phase 1 Monitoring phase 2 Total injected gas [billion m³] 1 0 0.5 2.5 5.5 Time in years

  22. Dewatering to increase gas volume 1.8 1.5 1.2 Without dewatering 0.9 Total injected gas [billion m³] 0.6 0.3 0 0 0.1 0.2 0.3 0.4 0.5 Time in years

  23. Dewatering to increase gas volume 1.8 With dewatering 1.5 1.2 Without dewatering 0.9 Total injected gas [billion m³] 0.6 0.3 0 0 0.1 0.2 0.3 0.4 0.5 Time in years

  24. Dewatering to increase gas volume Water injection into sandstone Horizontal gas injection wells Original oil/water contact Vertical dewatering wells

  25. Gas/liquid contact movement in the fractures

  26. UGS & EOR - concept Crestal gas injection wells Oil rim Residual oil 15 % Residual oil 25 % Original oil/water contact Downdip production wells

  27. Enhanced Oil Recovery (EOR) 2008 2030

  28. Enhanced Oil Recovery (EOR) • Production of incremental oil after several cycles • Up to 5 % recovery of incremental oil in place

  29. Effect of gas cycling on oil production

  30. Gas/Oil Contact in Fractures and Matrix Gas Injection Gas Production Gas invasion in matrix Gas invasion in matrix Gas/Oil Gravity Drainage in Matrix Gas/Oil Gravity Drainage in Matrix Gas/Oil Contact in Fractures Well Well Water/Oil Contact in Fractures

  31. Conclusions • Schönkirchen Tief is good candidate reservoir for high performance Underground Gas Storage • 1.5 bn m³ gas can be injected in phase one and 3 bn m³ gas in phase two (dewatering required)

  32. Conclusions • Schönkirchen Tief is good candidate reservoir for high performance Underground Gas Storage • 1.5 bn m³ gas can be injected in phase one and 3 bn m³ gas in phase two (dewatering required) • De-watering can be optimised by drilling vertical wells deep below the original oil/water contact • Enhanced Oil Recovery can be achieved due to the difference in residual oil saturation towards water and gas • Up to 5 % incremental oil can be recovered

  33. Acknowledgements Thanks to: • OMV E&P for the permission to publish this paper

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