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The article presents the study of a hydraulic hammer device for rotary well drilling. The mathematical model of the hydraulic hammer device has been described and studied, the relation of the dynamic load changes on the rock-destruction tool from the principal parameters of the hydraulic hammer device have been obtained. The trial rotary boring with the use of a hydraulic hammer device in drill tool assembly has been carried out, an increase in the drilling penetration rate has been achieved by 47%.

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The article is devoted to assessing the reliability of the cable line installation of an electric-centrifugal pump. Based on the analysis of the time between failures, the probability of failure-free operation of the cable line of the ESP installation was calculated to determine the time of scheduled repair.