Abstract
To select effective displacement agents, in order to limit waterflow to gas wells, it is necessary to understand the behavior of the multiphasesystem at the scale of individual pores, where capillary forces playan important role. In turn, capillary forces depend on interfacial tensionand wettability. As part of this work, computational microfluidics methodsusing the Open FOAM platform were used to analyze the effect of rockwettability on the features of two-phase filtration of water and gas in theporous medium model with fractures and traps.A mathematical model has been chosen that allows you to describe themovement of fluid in a fracture by the Navier-Stokes equations, and in theelements of a porous matrix by Darcy's law. Multivariable analysis ofwater displacement by gas was performed for different flow modes in caseof hydrophobic and hydrophilic surfaces. It has been shown that in thecase of a hydrophilic surface, the displaced water remains in the fracture«traps» in contrast to the hydrophobic surface, where the water is displacedcompletely. It has also been shown that as permeability increases,most of the gas is filtered into the matrix. However, for the hydrophilicsurface in the trap area, no filtration into the formation occurs, which isassociated with water capture in the fracture traps. It has been found thatmore intensive water washout occurs at low filtration rates. By displacingwater with filtration into a porous medium, most of the water can be lefttrapped, as opposed to displacing without filtration into a porous matrix.The proposed approach can be used as a screening technology to select theoptimal filtration modes and use modifiers for wetting the bottomholezone in order to limit water inflow into gas wells.
Published Version
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