Purpose. The purpose of the research is determination of boundary parameters of a downhole ejection system operation, analysis of critical stressed state of an ejector pump body and substantiation of the method of choosing its geometrical and strength properties. Methodology. On the basis of using classical methods of hydromechanics, the Bernoulli equation, the Darcy-Weisbach equation and continuity of flow it has been established that the most difficult conditions of ejector pump body operation appear during its exploitation in a cavitation mode. Combined analysis of hydrodynamic cavitation occurrence condition and strength condition enabled us to evaluate the boundary stressed state of the ejector pump body. Findings. In the process of modeling the ejector pump operation there is shown necessity to determine hydrodynamic parameters of flow which are suitable for extreme conditions of ejection system operation in a well. The obtained value of cavitation flow rate determines the waste of pressure in hydraulic canal of the annular space of a well and the maximum value of external pressure which influences the jet pump body. The succession of determination of stresses, which occur in the ejector pump body, and of minimum required, under strength conditions, thickness of its side has been shown. Originality. Relationship between hydrodynamic and strength characteristics of individual elements in a downhole ejection system has been determined. The principles of evaluating the stressed state of ejection system elements form theoretical basis for choosing geometrical parameters of the ejector pump body. Practical value. Reasoning the method for choosing the design parameters of a downhole ejector pump increases reliability of its usage and decreases probability of accidents, connected with failure of a bottom hole assembly. The suggested principle of combined analysis of hydrodynamic and strength characteristics can also be used for modeling the operating process of surface ejector pumps, which are the part of the system of extraction, gathering and preparation of oil and gas.

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