Inferring power consumption and electrical performance from motor speed in oil-well pumping units

Field tests are described which show that steady-state motor performance data can be used to simulate dynamic conditions in rod-pumped wells. It is shown that manufacturer-supplied data and motor speed measurements can be used to evaluate electrical quantities without the use of electrical measuring equipment. Further, it is shown that electrical predictions can be usefully incorporated into mechanical models of the rod pumping system. It is hoped that the ideas presented will help extend the economic life of hundreds of thousands of rod-pumped wells.