The effect of hydrochloric acid on a layered heterogeneous stratum is considered. In order to describe the changes in the filtration-capacitance properties of a porous medium, a model is used in the form of a bundle of cylindrical capillaries of various radii. A formula to determine the increasing rate of the radius of a pore channel is proposed, depending on its radius, a filtration rate, and the diffusion coefficient. The resulting system of equations is solved by a finite volume method on a uniform grid.

Keywords: porous medium, two-phase flow, function of pore scale distribution, capillary radius, control volume

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