Abstract

Abstract Previous studies showed that injection of water and gas as water alternating gas (WAG) process or simultaneous water and gas (SWAG) process can improve the sweep efficiency. Therefore, oil recovery from depleted reservoirs can be enhanced by combined injection of water and gas. However, SWAG process compare to WAG process is less known. Investigation of factors that affect on miscible SWAG injection is the aim of this study. For this purpose, a three-dimensional finite-difference reservoir simulator is used. Methane (as gas) at minimum miscibility pressure (MMP) is injected into an under-saturated reservoir which contained typical North Sea oil. Water and gas are injected at fixed rates by two separate horizontal wells. For more sweep efficiency and increase the distance gas and water travel before segregation, gas is injected at the bottom of reservoirs. For water, different locations of injection are tested and the effect of water injection location is studied. We also investigate the effect of water to gas injection rate ratios, well models, and reservoir heterogeneity on sweep efficiency and oil recovery.

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