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METHOD AND SYSTEM FOR ENERGY RECOVERY FROM A ROD PUMP
METHOD AND SYSTEM FOR ENERGY RECOVERY FROM A ROD PUMP
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机译:从棒状泵回收能量的方法和系统
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摘要
A system for energy recovery from a rod pump includes, in an exemplary embodiment, a hydraulic cylinder having a barrel, a piston, and a pressure chamber; the piston connected to a rod string of the rod pump; a reversible hydraulic pump connected to the pressure chamber; and a motor-generator having a rotor shaft connected to a coupling shaft of the pump; wherein the motor-generator operates in a motor mode to rotate the rotor and coupling shafts in a forward direction so that the hydraulic pump pumps hydraulic fluid to the pressure chamber to raise the piston and rod string in an upstroke, and operates in a generator mode in which a weight of the rod string displaces the piston in a downstroke to pump hydraulic fluid from the pressure chamber to rotate the pump coupling shaft and the rotor shaft in a reverse direction such that the motor-generator generates electricity.
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