The chemically enhanced gas injection technology (ChEGas-EOR) is a novel technique developed by “Equion Energia” in association with the “Universidad Nacional de Colombia”. In this technique, a liquid treatment having engineered properties is sprayed along with the gas stream in gas injector wells to increase the oil recovery factor in oil reservoirs. Previous lab tests, pilot studies in light & intermediate oil reservoirs indicate that the application of ChEgas-EOR allows for a reduction in operational costs, increases the chemical penetration radii and decreases the retention rate in the rock. However, the associated uncertainty is still too high to develop this process on a productive scale. For this reason, development of a phenomenological model is key to understand the mechanism related to disperse chemical injection and its effects on reservoir oil flow. In this work, we developed a phenomenological model to assist in design and evaluation of Chemical Gas EOR operations aiming to reduce the uncertainties and understand the optimize oil recovery. The model accounts for the chemical mass transfer between phases in a non-equilibrium state with an interception model, a dissolution model and a first order kinetic model for the surfactant sorption on the rock. The tool was calibrated with experimental data and with the adjusted parameters upscale to reservoir conditions to forecast the oil production in field pilots getting good agreement.


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