To accomplish this task, one has to define the in-, and output powers of the system and the different kinds of losses occurring in the various parts of the downhole and surface equipment. Thus, calculating the energy efficiency of sucker-rod pumping is a very important task of the production engineer. Therefore, it is of utmost importance to ensure that these systems work at their peak efficiencies. ,1752'8&7,21 On average, two-thirds of the world's oil wells are produced by sucker rod pumping installations. Through worked examples, the paper shows the advantages of using the proposed formula and recommends its future use for the calculation of the rod pumping system's power efficiency. This is why a new formula is proposed that properly describes the useful power exercised by the downhole pump and represents the minimum power requirement for lifting the given amount of liquid to the surface. The paper shows that the formula most often used in the industry may give inconsistent results under the same conditions. When evaluating the energy efficiency of sucker-rod pumped installations, the calculation of the rod pump's useful power plays a decisive role. ![]() ![]() After a detailed evaluation of the possible energy losses, a three-term formula is proposed in which the most important term is the lifting efficiency that describes the downhole energy losses in the rod-pumped well. ![]() The system's overall energy efficiency is defined and is broken into its constituent parts. The power losses occurring in a rod pumping system are detailed and are grouped in surface and subsurface losses. The paper investigates the power conditions of sucker-rod pumped installations.
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