Abstract

ABSTRACT This paper quantifies the accuracy of a state-of-the-art computer program used to predict the performance of walking beam pumping systems. The program used for the predictions includes models of the fluid and rods, which are coupled along the rods, at each taper, and at the subsurface pump. An extension of the Doty and Schmidt pump model is used to simulate the down-hole pump. The method of characteristics is used to solve the coupled partial differential equations that describe the forces and motion along the sucker rod string and in the liquid column. In addition, the program considers motor slip and rotating and articulating inertia in calculating.the pumping unit speed variations Comprehensive comparisons between field measurements and predicted parameters of 92 wells with depths ranging from 810 to 10,800 feet are given. In addition, comparisons between measured and predicted values are used to illustrate the effects of various details in modelling pumping systems. These comparisons show that when wells are carefully modeled, good agreement exists between measured and predicted parameters.

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