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Abstract <p>Mathematical modeling investigates the influence of an underpump sucker-rod on the longitudinal vibration intensity in the oilwell tubing and pumping unit assembly during operation of an&#xa0;electric submersible pump (ESP). The use of the underpump sucker-rods with a length of 1/4 wavelength with a dominant frequency of longitudinal vibrations of ESP reduces the vibration rate at this frequency by 2–3&#xa0;times, and the diameter of the underpump sucker-rod is of no importance. Such underpump sucker-rods in producing oil wells can help improve reliability and service life of ESP. When an underpump sucker-rod is set on the well bottom and pressed to the casing string along a spiral line, the longitudinal vibrations of the underpump sucker-rod transform into variable side stresses which influence the casing string and the reservoir rocks in the bottomhole formation zone, while no increase in the longitudinal vibration rate takes place in the pumping unit. The working ESP with the underpump sucker-rod rest on the well bottom conditions continuous vibration effects on a pay zone in the course of the well operation, which improves permeability of rocks in the bottomhole formation zone.</p>

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Applicability of Underpump Sucker-Rod for Efficiency Enhancement of Electric Submersible Pumps

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • A. M. Svalov

摘要

Abstract

Mathematical modeling investigates the influence of an underpump sucker-rod on the longitudinal vibration intensity in the oilwell tubing and pumping unit assembly during operation of an electric submersible pump (ESP). The use of the underpump sucker-rods with a length of 1/4 wavelength with a dominant frequency of longitudinal vibrations of ESP reduces the vibration rate at this frequency by 2–3 times, and the diameter of the underpump sucker-rod is of no importance. Such underpump sucker-rods in producing oil wells can help improve reliability and service life of ESP. When an underpump sucker-rod is set on the well bottom and pressed to the casing string along a spiral line, the longitudinal vibrations of the underpump sucker-rod transform into variable side stresses which influence the casing string and the reservoir rocks in the bottomhole formation zone, while no increase in the longitudinal vibration rate takes place in the pumping unit. The working ESP with the underpump sucker-rod rest on the well bottom conditions continuous vibration effects on a pay zone in the course of the well operation, which improves permeability of rocks in the bottomhole formation zone.