Symulacja procesu pracy dwuobwodowego wgłębnego systemu wypływowego

Abstract

The article is devoted to a study of the flow's nature distribution in the above-bit ejection system as part of a series and parallel connection of two jet pumps designed to improve the technical and economic indicators of drilling production wells. Using the finite element method and computer programs, the critical value has been determined of the hydraulic resistance of the sludged section of the bottomhole, which provides an automatic change in the ejection system operation mode from injection to injection-suction. Regularities of changes in the hydrodynamic parameters of the ejection system have been established and the probability and conditions for the existence of non-operating modes of jet pumps have been analyzed. When conducting experimental studies, the influence of the flow rate of the working medium on the flow characteristic of a jet pump of a direct-flow and swirling working flow has also been determined. To swirl the flow, a plate with an inclination angle of the guide elements of 15° placed in the working nozzle of the jet pump has been used. The swirling of the working flow makes it possible to increase the injection ratio of the jet pump. The maximum increase in the value of the injection coefficient is 20.84% and corresponds to small (up to 104) Reynolds numbers of the working flow. The ratio between the maximum and minimum values of the injection coefficient of the flow characteristics of the jet pump when swirling the working flow is halved.