Pumps – Motor driven – Fluid motor
Patent
1980-06-17
1982-08-31
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
60372, F04B 4712, F04B 4714
Patent
active
043470491
ABSTRACT:
A balanced hydraulic well pumping unit for actuating an underground pump in which the weight of the downstroke is utilized to store energy in an accumulator which is then used to assist in the upward stroke of the pump. A working rod passes through first and second vertically positioned cylinders and is connected to first and second pistons in the cylinders, respectively. Hydraulic power means are connected to the first cylinder for alternately supplying hydraulic fluid to opposite sides of the first piston for moving the working rod upwardly and downwardly. An accumulator is connected to opposite ends of the second cylinder whereby downward movement of the working rod causes the second piston to store energy in the accumulator which is then used to assist movement of the working rod upwardly on the upward stroke of the pumping unit. Preferably, the sucker rod of the well pump extends into the working rod thereby allowing the pumping unit to be positioned close to the well surface. Various controls are provided for admitting and replenishing air and hydraulic fluid to the accumulator and second cylinder, but limiting the amount of air and hydraulic fluid.
REFERENCES:
patent: 2325138 (1943-07-01), Kyle et al.
patent: 2366777 (1945-01-01), Farley et al.
patent: 2429947 (1947-10-01), Rose
patent: 3005413 (1961-10-01), Coberly
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