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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 12 – 13th November 2001 Aberdeen, Scotland Predicting Future Gas Lift Performance in a Mature Water Flooded Field Tony Liao & Simon Bishop, BP
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
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
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
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
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
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
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