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Immiscible fluid displacement in porous media occurs in several natural andindustrial processes. For example, during petroleum extraction from porous rockreservoirs, water is used to displace oil. In this paper, we investigateprimary drainage and imbibition in a heterogeneous porous medium using animproved numerical model based on the multicomponent pseudopotential latticeBoltzmann method. We apply recent developments from the literature and developnew pressure boundary conditions. We show that the proposed model is able tosimulate realistic viscosity ratios, and it allows independent tuning ofsurface tension from viscosity. Moreover, the model suppresses a non-physicalbehavior of previous schemes, in which trapped fluid volumes significantlychange with time. Furthermore, we show that the developed model correctlycaptures the underlying physical phenomena of fluid displacements. We simulateoil-water flows and verify that the measured values of irreducible water andresidual oil saturations are realistic. Finally, we vary the wetting conditionsof the porous medium to represent different wettability states. For thedifferent scenarios, we show that the simulations are in good agreement withexperimental results.

An improved multicomponent pseudopotential lattice Boltzmann method for immiscible fluid displacement in porous media