Apparatus for pumping fluid from a well

Details Apparatus for pumping fluid from a well Apparatus for pumping fluid from a well

1977-12-29

1980-02-12

Freeh, William L.

Expansible chamber devices

Displacement control of plural cylinders arranged in...

Having motor-operated adjustment

417545, F04B 106

Patent

active

041877659

ABSTRACT:
A device for use in well pumping apparatus of the type having a bottom hole pump actuated by a vertically reciprocating operating rod, and in which the pump is of the kind in which a tendency to gas lock can be corrected by extending the downstroke of the pump plunger until this taps on the bottom pump parts. The device of this invention is capable of variably limiting the downstroke of the operating rod to allow the pump to be tapped on the downstroke or to be lifted clear of the bottom, as required. The device includes a cylinder carried by the pump bridle and arranged to be supplied with hydraulic fluid, a piston in the cylinder arranged to be lifted when fluid is pumped into the cylinder, means for holding the piston in its raised position relative to the cylinder, and means on the piston for engaging with a member fixed to the operating rod to raise and lower this relative to the pump bridle.

REFERENCES:
patent: 2259020 (1941-10-01), Windman
patent: 3051237 (1962-08-01), Giles, Jr. et al.
patent: 3251310 (1966-05-01), Wittwer et al.
patent: 3367279 (1968-02-01), Crowe
patent: 3376826 (1968-04-01), Crowe
patent: 3782123 (1974-01-01), Muschalek

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