ASME/API Gas-Lift Workshop
description
Transcript of ASME/API Gas-Lift Workshop
ASME/API Gas-Lift Workshop12 – 13th 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>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
Miller Field Schematic
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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
Miller Multi-Reservoir Mbal Model
History Matching: Southern Tank
Simulation
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
Miller Integrated Model: Production Forecast
Gas Lift Well Performance Curves
Application of the Integrated Model
0 1 2 3 4 5 6 7 85400
5500
5600
5700
5800
5900
6000
6100
6200psig
Years
Tank Pressure, Reservoir by Case
MIL_V1 ( Southern co ) MIL_V1GL ( Southern co )
Monday, April 10, 2000 - 12:14 PM
Application of Integrated Model
0 1 2 3 4 5 6 7 860
61
62
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70
71
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73MMSTB
Years
Tank Oil, Cumulative by Case
MIL_V1 ( Central ) MIL_V1GL ( Central )
Monday, April 10, 2000 - 12:07 PM
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