ES-SAGD Relative Permeability as a Function of Temperature and Solvent Concentration
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This study provides an insight into ES-SAGD relative permeability and reveals its dependence not only on the downhole operating temperature but also on the injected solvent concentrations. Three experiments were conducted covering a wide range of solvent concentrations. Lab results indicate that residual oil saturation decreased as operating temperature and solvent concentrations creased. It was observed that residual oil saturation was substantially higher for steam flood compared to a co-injected solvent with steam process at the given temperature. A reasonably good match was achieved through history matching lab data using CMG STARS. Two sets of relative permeability curves were developed as a function of temperature and solvent concentrations using the history matched models. The newly developed rel. perm. models can be utilized for predicting Athabasca-type ES-SAGD projects performance. The history matches obtained with Corey exponent-based relative permeability curves are more likely when the process is operated using hot water injection while the final recovery factor was not matched perfectly under steam injection.