ABSTRACT
Oil-saturated layers are porous materials with different pore sizes, pore channels and composition of rocks that define the features of interaction formation and injected fluids with the rock. Taking the mentioned into account we can conclude that the displacement of oil from oil fields in production wells is not a mechanical process of substitution of oil displacing it with water, but a complex physicalchemical process in which the decisive role is played by the phenomenon of ion exchange between reservoir and injected fluids with the rock, i.e. nanoscale phenomena.
