ABSTRACT
About 25% of the oil reserves of the West Siberian oil and gas basin are contained in deposits that are characterized by complex structure, high clay content and low reservoir properties. The interaction of clay minerals with water causes an increase in their volume and, accordingly, blockage of the pore channels. It can stop filtration in low-permeability collectors. We have developed and patented the composition of surface-active substances, designed for practical use in the artificial flooding of low-permeability polymict reservoirs. The composition allows to reduce the interfacial tension at the interface “oil-water”, diffuse from the aqueous solution into the oil and have a dispersing effect on asphaltenes and inhibitory effect on the hydration of clay minerals in the composition of the reservoir rock. Based on the composition, a technology has been developed for the physicochemical effect on the oil reservoir, based on the injection of the surfactant composition developed through the injection wells of the RPM system. The results of the hydrodynamic simulation of the waterflooding with this composition showed an increase of 4.2% in the oil recovery rate from the reservoir site model.
