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ASME/API Gas-Lift Workshop

ASME/API Gas-Lift Workshop. 12 – 13 th November 2001 Aberdeen, Scotland. Predicting Future Gas Lift Performance in a Mature Water Flooded Field. Tony Liao & Simon Bishop , BP. Miller Field. Location of Miller Field. Miller Field Background. Discovered in late 1982

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ASME/API Gas-Lift Workshop

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  1. ASME/API Gas-Lift Workshop 12 – 13th November 2001 Aberdeen, Scotland Predicting Future Gas Lift Performance in a Mature Water Flooded Field Tony Liao & Simon Bishop, BP

  2. Miller Field

  3. Location of Miller Field

  4. Miller Field Background • Discovered in late 1982 • Oil was found 4,000 meters beneath the seabed in a water depth of 100 meters • The field lies 270km NE of Aberdeen • Estimated 240 million barrels of recoverable oil and 480 billion cubic feet of associated gas

  5. Miller Field Background • Oil production commenced in May 1992 • Gas production following about two months later • Brae field has been on production since 1983 • Reservoir pressure in Miller has declined while Brae has been produced

  6. Objective • Predict performance of Miller field if 4 of 9 naturaly flowing wells are converted to gas lifted • Provide BU and partners performance data to make production management decision

  7. Study Methodology • Match production & injection history of Miller field • Integrate reservoirs, wells, and surface network in a completed system • Tune well models against well test data • Generate vertical lift performance (VLP) curves for all naturally flowing & gas lifted wells • Generate well IPR curves • Generate well performance curves based on VLP & IPR curves • Predict field performance under different operation strategies and system constraints

  8. Miller Field Schematic

  9. Multi-Reservoir Model Consideration • Pressure data showed distinct trend in each compartment • Geological description clearly supported a multi-tank system • Single tank Mbal model was tested but history match was not as good

  10. Miller Multi-Reservoir Mbal Model

  11. History Matching: Southern Tank

  12. Simulation

  13. Application of Integrated Model • Forecast production from every well, every tank, and the entire reservoir • Forecast water injection to each tank • Evaluate the impact of converting certain wells to gas lift at a specified time

  14. Miller Integrated Model: Production Forecast

  15. Gas Lift Well Performance Curves

  16. Application of the Integrated Model

  17. Application of Integrated Model

  18. Conclusion • Converting four wells from naturaly flowing to gas lifted will be beneficial for the Miller field • Cumulative oil production incremental is 1 MMB over 4 years • Integrated study provided Miller Business Unit with technical results required for reservoir management decision

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