The process of oil extraction requires continuous monitoring of oil wells operation. To improve the efficiency of oil wells, it is necessary to set the optimal mode of oil pumping unit operation in which the rate of liquid pumping corresponds to that of its inflow. Many oil wells are strippers and therefore are operated intermittently. Application of automated control systems requires not only reliable data on the oil-extraction equipment status, but also determination of restrictions which arise from the conditions of error-free performance of the electric drive system. This can only be done on the basis of mathematical modelling.
The method and algorithm developed to compute operating modes of sucker-rod pumping units (SRPU) allow the walking beam oscillation frequency to be determined depending on the oil formation flow rate, as well as the restrictions regarding the range of its regulation defined by torque and heat overload of the motor. The computation algorithm is underlain by the fine mathematical models of the asynchronous motor (AM) and sucker rod pump, and the method of computation of periodic dependencies of the unit operating mode coordinates by solving a boundary-value problem.
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