Motors: expansible chamber type – Constantly applied motive fluid with controlled venting – Plural separately controlled vents
Patent
1983-03-29
1985-03-12
Richter, Sheldon J.
Motors: expansible chamber type
Constantly applied motive fluid with controlled venting
Plural separately controlled vents
60369, 91 50, 91311, 91318, 91452, F15B 1302, F01L 1502
Patent
active
045037523
ABSTRACT:
A hydraulic pumping unit is provided that is especially adapted for use for pumping oil from a well, and that provides for independent upstroke and downstroke speed control of the well sucker rod. The pumping unit includes a load sensing, pressure and flow compensated pump that is destroked under no load conditions, a pumping cylinder including a polished rod coupled to the sucker rod, and a unique hydraulic valving assembly that couples the hydraulic fluid pump with the pumping cylinder. The hydraulic valving assembly includes a cylinder control module for independent control of the rates at which the polished rod is raised and lowered, and a signal control module for indicating the upper and lower limits of polished rod travel within the pumping cylinder. The cylinder control module provides for soft turnaround of the polished rod, thereby guarding against stretching of the sucker rod and subsequent degradation of the unit's pumping capacity.
REFERENCES:
patent: 2789542 (1957-04-01), Vander Kaay
patent: 2934899 (1960-05-01), Roplin et al.
patent: 2972863 (1961-02-01), Hyde
patent: 3939656 (1976-02-01), Goldfein
patent: 3986355 (1976-10-01), Klaeger
patent: 4249376 (1981-02-01), Weckerly
patent: 4321855 (1982-03-01), Bacquie et al.
Olson Samson A.
Williams George C.
Hypex, Incorporated
Richter Sheldon J.
Smith Randolph A.
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