Introduction
Usually a relatively efficient displacement process. Recovery factor can be high.
Aquifer under or aside the oil column.
Aquifer movement drives the oil.
If the aquifer is weak, then the other expansion terms and, in particular, solution gas drive will dominate.
Characteristics
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Pressure decline is very gradual. Oil and gas withdrawals are essentially replaced barrel for barrel by the encroaching water.
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Early excess water production in structurally low wells
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Minimum change in producing GOR
References:
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T. A. Blasingame, PETE 663: Introduction to Reservoir Engineering, Texas A&M Course Notes, 2014
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PETE 2320: Reservoir Engineering, Northern Alberta Insititute of Technology (NAIT) Course Notes, 2019.