Abstract
A computer program for solving a two-dimensional, two-phase, miscible flow-model is presented. The model was formulated by the Galerkin method to a finite element discretization of the flow domain. Capillary pressure, solubility between phases, rock and fluid compressibility, and gravity effects were considered. Elemental matrices, originated by this method, were obtained in a closed form by using linear, triangular finite elements for spatial discretization, along with a lumping technique. A simultaneous solution technique was used to solve pressures and saturations of the wetting phase by using a fully implicit scheme for the step-by-step integration in time. The program may be used to simulate recovery or displacement processes in porous media, particularly gas injection in water and air or oil and gas systems, for two-dimensional horizontal and vertical geometries, and for three-dimensional axis-symmetric geometry. Boundary conditions on saturations, pressures, and volumetric fluxes may be imposed easily to simulate a wide extent of practical physical problems. The listing of the program, written in FORTRAN 77, is included along with the user manual and an illustrative test case to show the use of the program.
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