Fifth Comparative Solution Project: Evaluation of Miscible Flood Simulators

Abstract

ABSTRACT This paper presents the results of comparisons between both four-component miscible flood simulators and fully compositional reservoir simulation models from seven different participants for a series of three test cases. These cases varied from scenarios dominated by immiscible conditions to scenarios in which minimum miscibility pressure was maintained or exceeded throughout the simulations. In general, agreement between the models was good. For a test case in which reservoir pressure was maintained above the minimum miscibility pressure, agreement between four-component simulators, with the assumption of complete mixing of solvent and oil, and compositional simulators was excellent based on cumulative oil production as a function of cumulative water injection. For cases in which immiscible conditions dominated, the four-component models tended to be pessimistic compared to fully compositional models because condensible liquids were not considered to be carried in the gaseous phase in the four-component simulations. Relative permeability treatment, especially near the injection well, tended to dominate the timing of recovery and injectant breakthrough.