Dynamic analysis of sucker rod pumping

Abstract

The complexity of the interaction between surface and down-hole equipment has made accurate analysis of sucker rod pumping systems difficult at best. Consequently, realistic predictions of performance are seldom, if ever, made in advance of construction. The petroleum industry has, over the years, compiled a substantial catalog of case histories, in effect, as a data base from which general design guidelines can be developed. However, the analytical work to date has been either sketchy or without sufficient basis in published documentation. The analysis to be presented here addresses the dynamic behavior of the complete pumping system in, what is hoped to be, a complete and concise manner. The viewpoint is that of the designer or manufacturer of this system. That is, the total dynamic response will be derived based on a given set of input parameters. Factors which are considered consist of, but are not limited to, pumping unit kinematics, rod stress/strain relationships, imposed torques and drive motor slip.