This article considers the effect of a hydrophobizing additive on the change in the wettability of a porous medium. The geological and technical operations number is growing due to the development of depleted fields and new fields with complex reservoir conditions. During geological and technical operations hydrophobization of porous medium surface is necessary to prevent negative consequences of surface wettability changes. The geological and technical operations can lead to an increase in the water saturation of the bottomhole zone, water blockades formation and a decrease in the relative phase permeability of the hydrocarbon phase. To study this interaction, a series of filtration tests was carried out on sandstone models. Free volume tests of the hydrophobizing additive on the surface of quartz glass and the porous medium showed the potential for changing the wettability of a hydrophilic surface due to its treatment with a solution of surfactants under static conditions. During experiments under dynamic conditions, the potential for changing the wettability of the rock was shown when it was treated with an aqueous solution with different concentrations of a reagent. As a result, a correlation between the specific surface area of the porous medium and the concentration of the water repellent in the solution was established. At the determined empirically optimum concentration of the hydrophobizing additive the resistance factor for the aqueous phase was less than 1, which indicates an increase of water mobility. This was directly confirmed by experiments to determine the residual water saturation during injection of oil phase into a model porous medium - the coefficient of residual water saturation for a model of a porous medium treated with a hydrophobizing additive turned out to be 2 times lower than for a model that was not treated with a hydrophobizing additive solution.
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