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|Quarter five-spot flood comparison:||Rectilinear flood comparison:||Perturbed initial interface:|
Videos: Numerical simulations comparing different EOR schemes like polymer flood, surfactant flood and SP flood with waterflood in both quarter five-spot and rectilinear geometries with heterogeneous permeability fields. The video tag is not supported in Internet Explorer 8 and earlier versions.
Chemical enhanced oil recovery by surfactant-polymer flooding has been studied in two space dimensions. A two-phase porous media flow model has been proposed that incorporates the effect of capillary pressure and also the effect of polymer and surfactant on viscosity, interfacial tension and relative permeabilities of the two phases. A new global pressure for the two-phase, incompressible, immiscible, multicomponent porous media flow has been defined so that the equation for the global pressure remains same as the one for the pressure in the absence of the capillary pressure. This canonical form of the equation is solved more efficiently for the global pressure from which the phase pressures are easily recovered. The coupled system of equations for pressure, water saturation, polymer concentration and surfactant concentration is solved using a hybrid method in which the elliptic global pressure equation is solved using a discontinuous finite element method and the transport equations for water saturation and concentrations of the components are solved by a Modified Method Of Characteristics (MMOC). Numerical simulations have been performed to validate the method, both qualitatively and quantitatively, and to evaluate the relative performance of the various flooding schemes for several different heterogeneous reservoirs.
In this paper, a convergence study of a characteristics-based hybrid method recently introduced in Daripa & Dutta (J. Comput. Phys., 335:249-282, 2017) has been performed. This method solves a system of equations that govern two-component two-phase porous media flows. For the analysis, a reduced system of equations representing one component two-phase flows in one-dimension has been considered. Some error estimates have been obtained and possible extensions of the analysis to two-dimensional and two-component flows have been discussed. The theoretical convergence results have been validated by realistic numerical simulations of flows arising in enhanced oil recovery processes.