MODELING OF THE WORKING PROCESS OF AN OVER-CHISEL SHOCK-EJECTION DEVICE
DOI:
https://doi.org/10.31471/1993-9965-2024-2(57)-42-49Keywords:
ejection system, downhole jet pump, shock device, injection coefficient, pressure characteristics, electrohydrodynamic analogyAbstract
The algorithm for determining the hydraulic characteristics was developed and the working process of the author's proposed design of the shock-ejection device designed to increase the efficiency of drilling wells in conditions of increased rock strength was developed. The developed over-chisel arrangement consists of a parallel impact device in the form of a ball vibrator and a jet pump in the form of an injection-suction type ejection system. The impact device increases the efficiency of rock destruction, and the jet pump intensifies the process of washing the hole. The hydraulic calculation of the working process of the superchisel impact-ejection assembly is based on the application of the method of electrohydrodynamic analogies supplemented by the equations of the characteristics of the jet pump. The hydraulic model of the working process of the shock-ejection assembly involves the solution of the system of cost balance equations for the nodal points of the ejection system, head losses in parallel links of the closed suction circuit of the circulation of the flushing solution, and the analytical expression that determines the pressure-cost characteristic of the jet pump. In the process of determining the hydraulic losses in separate parallel links of the suction circuit, classical relations were used to calculate the hydraulic losses in local resistances and the empirical dependence of the coefficient of hydraulic resistance of the ball vibrator on the Reynolds number of the flushing solution flow. The proposed hydraulic model of the working process of the shock-ejection device made it possible to determine the nature of the distribution of flows in the hydraulic system of the well layout. According to the obtained results, the maximum flow of the flushing solution is directed to the
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