Pumps – Motor driven – Fluid motor
Patent
1979-08-13
1981-05-19
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
60413, 60371, 91189R, 91452, 91517, 91518, F04B 910
Patent
active
042682282
ABSTRACT:
A hydraulic pumping unit for vertically actuating a downhole pump including first and second hydraulic piston and cylinder assemblies. The first assembly is connected to the downhole pump and the second assembly is connected to a counterweight. A hydraulic line is connected between the first and second assemblies so that the counterweight counterbalances the downhole pumping equipment. A hydraulic pump is connected to the first and second assemblies through switching means for alternately supplying hydraulic fluid to and from the first and second assemblies. A check valve is provided between the hydraulic pump and the hydraulic line for replenishing the assemblies with fluid. A safety valve is connected between the first assembly and the hydraulic line for preventing the first assembly dropping in the event of a hydraulic line failure. A return valve in parallel with an orifice closes in the event the hydraulic pump stops for preventing free fall of the first assembly. A pressure switch connected to the second assembly insures that hydraulic fluid is supplied into the first cylinder to prevent actuation of the check filling valve on each stroke.
REFERENCES:
patent: 2313405 (1943-03-01), Vickers
patent: 3632234 (1972-01-01), Lake
patent: 3778193 (1973-12-01), Reinert
Delta-X Corporation
Smith Leonard E.
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