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) toa downhole pump. A downhole and uphole coupling member is provided at oppositeends of the segment. The coupling members each have a central longitudinalborecomprising two contiguous portions; a binding portion having an internalhelically-spiralled portion for grasping and being non-rotatably secured torespective oppositeends of the segment and a coupling portion to be coupled to the downhole pumporsucker rod(s), as the case may be. In a preferred embodiment the torsionalresistiveforce of the wire rope segment is initially less than that required to turnthe rotor of theprogressive cavity pump but upon twisting proportionally increases to a valuegreaterthan the torsional force required to rotate the rotor. A system for pumpingoil from awell using a pump and the aforesaid wire rope segment is further disclosed.