Patent ID: 8066496

Claim:
A pumping system comprising: a hydraulic cylinder being vertically oriented and elongated and housing a fluid pressure and a piston, said piston being vertically displaceable and having a piston rod extending beyond a bottom end of said hydraulic cylinder and being in communication with a sucker rod string; a controlled hydraulic power system providing fluid pressure to said hydraulic cylinder to vertically reciprocate said piston and therefore the sucker rod string; a tee fitting having an upper end secured to said bottom end of said hydraulic cylinder and a lower end secured to a well tubing, said piston rod passing through a vertical passageway of said tee fitting; a seal member located entirely within said hydraulic cylinder and sealably receiving said piston rod and having an upper surface sealing said bottom end of said hydraulic cylinder and having a lower surface in communication with a well fluid and confining the well fluid to an interior of said tee fitting; and a vertically reciprocal pump including: a pump barrel having a standing valve at a lower end thereof and a pump barrel vent port spaced above the standing valve; a pump plunger positioned within said pump barrel and adapted for reciprocation by said sucker rod string, said pump plunger having an upper plunger portion and a lower plunger portion and a pump plunger vent port located between said upper and lower plunger portions; said upper plunger portion having a plurality of non-metallic wiper rings sealably engaging said pump barrel; reciprocation of said pump plunger resulting in a fluid column within the tubing continually being supported by the plurality of non-metallic wiper rings of said upper plunger portion; said pump barrel vent port in combination with said pump plunger vent port and said lower plunger portion equalizing with a fluid pressure of the well fluid at the lowest setting depth of said vertically reciprocal pump in a well bore and permitting said pump barrel to fill independent of a stroke rate and suck in the well fluid on an upstroke of said vertically reciprocal pump.