Abstract
In the emulsion flooding processes, the flow of the emulsion droplets facilitates the oil recovery. However, there is currently limited insight into the microscopic enhanced oil recovery mechanism of emulsion droplets. It is essential to conduct further research to explore the interactions among the emulsion phase, oil phase, and water phase. In this work, the role of emulsion droplets on the mobilization of residual oil was numerically studied by the phase field method. We have studied the relevant mechanism in a single flow region structure, and a porous media. The results show that droplet radius, interfacial tension, and wettability all affect the flow behavior of the emulsion phase. The flow of emulsion results in much more displacement efficiency and sweep efficiency, which helps recover trapped oil in pore corners and the low permeability areas in the porous medium. In contrast to water flooding, the emulsion flooding elevated the oil recovery from 42.8% to 48.5% in the high-permeability region and from 10.9% to 40.4% in the low-permeability region.
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