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The article presents a technology for building a water-shut screen in an oil well. The technology is based on drilling of radial channels within the water-encroached formation and following injection of water insulation composition in these channels. The proposed technology provides a durable screen of increased diameter and width. It contributes to a longer period of low watercut production in an oil well.

The article presents the results of experimental studies of the surface properties of gas-thermal spray coatings of the rotor downhole drilling motors. Was analyzed the adhesion and corrosion resistance of coatings, obtained as a result of putting various powders on steel of various grades. It was established experimentally that the substrate material of the examined steels has almost no effect on the adhesion of the coating.

The article describes the methods of applying of protective coatings to the rotor of downhole drilling motors. The analysis of the effectiveness of methods of applying of protective coatingswas carried out. The article shows that the transition to gas-thermal spraying method with laser melting allows to achieve high technical and technological results in comparison with other methods.

The article analyzes the results of tests of mechanical resistance of laboratory specimen coating applied by laser deposition. Based on the analysis a conclusion is drawn about the effect of protective coatings and their application methods on the friction coefficient and relative wear resistance.