Patent ID: 8066496
Filing Date: 2011-11-29
Classification: E21B,F04B

Abstract:
1. 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: