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Most reservoirs in the world are initially depleted under primary recovery, using only the natural energy of the reservoir to recover the oil. The main drive mechanisms for primary recovery are typically:
- Solution Gas Drive
- Gas Cap Drive
- Water (Aquifer) Drive
although cold heavy oil production with sand (CHOPS) have different mechanisms.
Epic has ample experience in simulating reservoirs producing on primary recovery. Upon obtaining a good history match on production volumes (oil, gas, and water), as well as pressure, the model can be used to generate base case forecasts, scope infill locations, investigate optimal spacing of wells, and determine the reservoir’s upside potential for secondary and tertiary recovery schemes.
The following example shows the pressure match and a ternary diagram of a primary recovery reservoir modeled by Epic. The purpose of the study was to get a feel for the original hydrocarbon volume in place (by matching pressure history), forecasting ultimate recovery under primary depletion, and investigating infill well potential locations.
See Epic Written Papers on Primary Recovery |
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Simulated pressure for primary depletion
Initial state of reservoir
Final depleted state of reservoir
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