A WIRE ROPE SEGMENT FOR DAMPING TRANSMISSION OF CYCLIC FORCES TO A DOWNHOLE PUMP, AND A SYSTEM FOR PUMPING OIL FROM A WELL USING A WIRE ROPE SEGMENT

摘要

A wire rope segment for damped transmission of energy from sucker rod(s) to a downhole pump. A downhole and uphole coupling member is provided at opposite ends of the segment. The coupling members each have a central longitudinal bore comprising two contiguous portions; a binding portion having an internal helically-spiralled portion for grasping and being non-rotatably secured to respective opposite ends of the segment and a coupling portion to be coupled to the downhole pump or sucker rod(s), as the case may be. In a preferred embodiment the torsional resistive force of the wire rope segment is initially less than that required to turn the rotor of the progressive cavity pump but upon twisting proportionally increases to a value greater than the torsional force required to rotate the rotor. A system for pumping oil from a well using a pump and the aforesaid wire rope segment is further disclosed.