The article presents the results of a study of the environmental and technological problem of oil-saturated reservoir pollution by technical water injected for oil displacement and reservoir pressure maintenance. This problem is considered on the example of a productive formation developed within one of the fields in the Perm region. It is noted that during the injection of technical water, an intensive degradation of reservoir properties is observed. The reservoir properties degradation is associated with clogging of filtration channels with mechanical impurities contained in technical water, swelling of clay minerals of the rock, and reproduction of microorganisms. The analysis of existing methods for solving this problem is carried out. For the object under consideration, an approach is proposed, which consists in the transition from the injection of technical water to the injection of produced water in order to reduce the clogging effect. This technology is widely known in the oil and gas industry and is characterized by high efficiency in the presence of certain features of the geological structure of the development object and the movement of fluids in the pore space of the reservoir rock. A comprehensive assessment of the effectiveness of the proposed approach is given. In order to substantiate the possibility and expediency of its implementation at the object under consideration, a series of laboratory studies was carried out using various methods, including filtration and X-ray tomography. The results of laboratory studies were used to carry out calculations on a hydrodynamic model. The results of calculations for the basic and proposed variants confirmed the technological efficiency of the transition from technical water to produced water. The conducted studies have shown the feasibility of injecting produced water: this will make it possible to achieve target parameters and reduce environmental risks in the process of field development.
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