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Relevance. Up to date, one of the most unfavorable factors complicating artificial oil lift is the interaction of mechanical impurities carried by production fluid with downhole equipment assemblies. According to statistical studies, mechanical impurities are the determining cause of malfunctions in the electric-centrifugal pump units operation. Object: wire-wound screen with the best hydraulics compared to other types of mechanical filters. Despite its widespread use, today there is no generally accepted method for calculating the operating practices of wells equipped with electric-centrifugal pumps with mechanical filters. At the same time, paper shows that mechanical filters, due to hydraulic resistance, have a significant effect on the geometry of the fluid flow lines in the pump suction area, therefore, the gas phase and the fraction of mechanical impurities moving in the flow. Purpose: investigation of the influence of the hydraulic characteristics of mechanical filters on the features of the flow of pumped-out products in the electric-centrifugal pump interval; development of a mathematical model of multicomponent gas-liquid flow containing mechanical impurities in the interval of receiving electric-centrifugal pumping unit equipped with a wire-wound screen. Results. It was shown that for a pump with a wire-wound screen due to the hydraulic resistance created by it, the intake interval works more evenly, and as the hydraulic parameter decreases, a more uniform profile of the radial fluid inflow in the pump suction area is achieved. The features of the flow of gas bubbles and suspended particles of mechanical impurities moving in the flow of liquid in the area of the pump suction area are investigated. It is shown that the conditions for gas separation at the intake, as well as the distribution of the concentration of mechanical impurities, change when the hydraulic characteristics of the screen in the pump are varied, which must be taken into account when designing the well operation parameters. The influence of the filter hydraulic characteristics on the value of pressure losses during liquid flow through the filter element is investigated.

Relevance. To date, the exploitation of a significant share of oil fields is mechanized and is accompanied by a number of complications due to the decline in production rate wells, irrigation products, corrosion, and deposition of mechanical impurities in the components of the pumping equipment. The accumulation of reservoir water and mechanical impurities in the wellbore leads to the increase in the mixture density in the well, decrease in reservoir depression and flow rate, and growth in the rate of casing corrosion wear. In this regard, one of the most urgent tasks of cost-effective well operation is to ensure the conditions for removal of reservoir water and mechanical impurities from the well bore. Object: producing wells that exploit watered formations, the products of which contain mechanical impurities. The interval below the pump intake is equipped with a shank designed to increase the flow rate and provide conditions for removal of reservoir water and mechanical impurities. The purpose of the research is to substantiate the optimal diameter of the shank, which provides conditions for removal of reservoir water and mechanical impurities from the bottom of wells and, accordingly, the minimum pressure drop in the wellbore below the pump intake. Results. The influence of operational parameters (water cut, product viscosity, flow rate) on the formation of a pressure gradient in the wellbore below the pump intake is studied. The authors have developed a computational method for determining the diameter of the shank, which ensures the removal of water and mechanical impurities from the bottom of waterlogged oil wells, implemented in the form of a computer program. It is shown that the efficiency of the shank use in terms of reservoir water removal increases as the water cut, the viscosity of the product and the flow rate of the well decrease. It is found that as the well flow rate decreases in the liquid, the diameter of the shank, which is necessary for removal of mechanical impurities, decreases.

Relevance. One of the most important factors determining the efficiency of the rod pump installation is the degree of balance in the drive. With existing balancing technologies, pumpjack units are subject to significant fatigue wear due to high loads on the drive. This leads to premature failures and increased power consumption. The foregoing determines the relevance of development and improvement of methods for balancing pumping units. Object: rod pumping installation with a combined rotary-wellhead counterbalancing system, including a wellhead counterweight, applied through flexible rod directly to the wellhead rod, which allows compensating a part of the constant load at the point of suspension of the rods, due to the weight of the rod string in the liquid. The aim of the research is to develop a technique for calculating the combined rotary-wellhead counterbalancing system, including determining the weight of the wellhead counter-load and calculating the rotor counterweights located on the crank; energy optimization of the balancing system, based on the fulfillment of criteria for minimizing the load on the drive and the energy expended to lift well production during the calculations. Methods: application of the principles of analytical mechanics for compilation of the equations of the dynamics of the system under consideration, numerical simulation methods in the study of formation of dynamic loads in the underground and surface parts of the rod pump installation. Results. The authors have developed the technique for calculating a combined rotary-wellhead counterbalancing rod pump installation, which minimizes the load on the drive of the pumping unit and helps reduce energy consumption for oil production by ensuring a uniform load on the drive motor during a swing cycle. When calculating the dynamic loads in the units of the pump installation, the effectiveness of the rotary-wellhead counterbalancing system is shown.