Purpose. Developing a mathematical model for the efficiency and reliability of the pumping unit (PU) of the oil pumping station (OPS) on the basis of the per-unit system and the methodology of the system approach which contains the electric, hydraulic and mechanical subsystems and reflects the energy inputs and outputs of the centrifugal pump (CP) and synchronous motor (SM). Methodology. Mathematical models of PU of OPS are developed which are synthesized on the basis of a system approach taking into account the impact of their operating modes on reliability and efficiency parameters of the SM and CP. This allows determining the optimal operation modes of PU OPS and to develop measures for their implementation. Findings. Based on a systematic approach a model which is a unified system of subsystems with different physical nature was formed. The mathematical model of efficiency and reliability parameters of SM and CP was formalized as polynomials and values of their coefficients were calculated. It was clarified that the extreme values of efficiency and reliability are achieved for different flow rate values. That requires the use of multi-objective optimization studies. Originality. Based on the systematic approach, a reliability parameters of SM and CP. It is clarified that the extreme value s of efficiency and reliability parameters of SM and CP are achieved for different flow rate values. Practical value. Mathematical models that allow estimating the impact of changes of flow rate of OPS on the performance and reliability parameters of SM and CP to select the best operating mode without expensive field experiments are developed.

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