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CO2 Huff-Puff Simulation Using a Compositional Reservoir Simulator

1986; Linguagem: Inglês

10.2118/15503-ms

H. -H. Hsu, R. J. Brugman,

Hydraulic Fracturing and Reservoir Analysis

ABSTRACT Increased field application of the CO2 Huff-Puff process has resulted in increased laboratory and numerical simulation activity. This paper focuses on numerical simulation of the CO2 Huff-Puff process in a light oil reservoir, using a fully-compositional reservoir simulator. A simulation model is first validated by successfully history-matching production data from two huff-puff cycles. A performance prediction is then conducted for a third cycle. A number of parametric runs are performed to determine oil recovery as affected by: The number of cycles,The timing of injection, soak and back-production operations, andThe quantity and composition of the injected sol vent. The following conclusions can be made based on the results of the CO2 Huff-Puff simulation: The simulation of a CO2 Huff-Puff process is possible through the use of a compositional reservoir simulator. A successful history match of oil, water, and GOR was conducted for two cycles of a CO2 Huff-Puff project in Paradis Field, Louisiana. The model is suitable for design, evaluation and prediction of a CO2 Huff-Puff project. It can also assist engineers in gaining insight into the oil recovery mechanisms in a CO2 Huff-Puff project.The simulation results from the Paradis project indicate that, The primary CO2 effects on oil recovery appear to be vaporization of intermediate components, oil viscosity reduction and oil phase swelling,A significant drop in incremental oil recovery occurred between the first and second cycles for this particular project. A third cycle would probably not be attractive,Variation in soak time from 5 to 40 days has little effect on oil recovery,The most important parameter affecting oil recovery appears to be the quantity of injected solvent, andContamination of a pure CO2 solvent with up to 20 mole percent N2 or CH4 has little effect on oil recovery.