Wag Design: Miscibility Challenge, Tools and Techniques for Analysis, Efficiency Assessment

Abstract

WAG injection combines advantages of gas drive efficiency with mobility control and sweep enlargement due to simultaneous water-gas flow. A complex preliminary investigation is the basis of successful application of gases. Such investigation determines appropriate and available type of gas, attainability of miscible flood, technology of gas injection. This paper combines modern achievements in theory and practice of gas application for EOR with new approaches for ternary phase and saturation diagram analysis, comparison of different gas injection technologies on saturation triangle and mobility control during WAG process. The proposed investigation workflow is presented on the example of real field in East Siberia.