Publication Rights Reserved This paper is to be presented at the 38th Annual Fall Meeting of the Society of Petroleum Engineers of AIME in New Orleans, La., on October 6–9, 1963, and is considered the property of the Society of Petroleum Engineers. Permission to publish is hereby restricted to an abstract of not more than 300 words, with no illustrations, unless the paper is specifically released to the press by the Editor of the JOURNAL OF PETROLEUM TECHNOLOGY or the Executive Secretary. Such abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or SOCIETY OF PETROLEUM ENGINEERS JOURNAL is granted on request, providing proper credit is given that publication and the original presentation of the paper. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and considered for publication in one of the two SPE magazines with the paper. Abstract A computer program has been developed which utilizes readily available information to calculate (1) the dynamic forces in a sucker rod pumping system, (2) the efficiency with which the installed equipment is operating, and (3) the actual cost of operation of the installed equipment and the cost of any inefficiency with which the equipment is operating. The print-out contains all the information necessary for comparison of actual and ideal operating conditions. Experience to date indicates that 20 to 60 percent of the cost of operating sucker rod pumping systems is the result of inefficient use of pumping equipments Introduction The goal of any producing operation is to recover the maximum oil at the minimum expense consistent with good operating practice. During the past several years, The Pure Oil Company has been increasing its concentration on this philosophy. An analysis of operating costs almost invariably resulted in the conclusion that something needed to be done about pumping costs. Not only were milling systems operating at low efficiencies but, in addition., it appeared that considerable money was being spent for oversized equipment. A well by well study and analysis of pumping systems did not appear feasible because (1) dynamometer analyses require far more time than Pare's technical staff could devote to the problem and (2) manual calculation methods are time consuming and not sufficiently accurate to yield worthwhile results. During early 1962, Midwest Research Institute, under contract to Sucker Rod Pumping Research, Incorporated completed the development of a method of calculating the dynamic forces in a sucker rod pumping system. The method requires only input data which are readily available and, as Pare's field tests have proven, yields results which compare very well with measured values. The major exception to the good comparison is in calculated torque, which ranges up to 60 percent above the measured torque.