Pumps – Motor driven – Fluid motor
Patent
1986-06-23
1988-08-02
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
91275, 92137, 60376, F04B 4704
Patent
active
047611200
ABSTRACT:
A well pumping unit comprising a double acting hydraulic cylinder actuator supported on a mast above a wellhead and having a piston rod connected directly to the polish rod of an elongated subsurface pump rod string. A generally cylindrical annular counterweight is disposed around the mast and is interconnected with the cylinder actuator by flexible chains trained over crown sheaves and travelling sheaves connected to the upper piston rod offsetting the weight of the pump rod string and at least a portion of the weight of the fluid column in the well. The pumping unit is controlled by a hydraulic control system including a directional control valve and flow control valves for selectively controlling the strokes of the cylinder actuator. A hydraulic pressure load sensing system measures total load on the rod string and provides for automatic shutdown of the actuator if the fluid level in the well is pumped below a predetermined level. The counterweight includes a tank for receiving a selected amount of liquid which may be pumped into or out of the tank by a reversible motor driven pump controlled by a circuit which senses an imbalance in the working pressures of the hydraulic fluid being supplied to the cylinder actuator to correct the effective weight of the counterweight for changes in fluid density and lifting effort of the actuator.
REFERENCES:
patent: 2536965 (1951-02-01), Taylor
patent: 3939656 (1976-02-01), Goldfein
patent: 3986355 (1976-10-01), Klaeger
patent: 4198820 (1980-04-01), Roth et al.
patent: 4305461 (1981-12-01), Meyer
patent: 4430924 (1984-02-01), Dunn et al.
patent: 4432706 (1984-02-01), Gilbertson
patent: 4438628 (1984-03-01), Creamer
patent: 4512149 (1985-04-01), Weaver
patent: 4530645 (1985-07-01), Whatley et al.
Mayer James R.
Sparkman, Jr. Robert T.
Martin Michael E.
Smith Leonard E.
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