Oil well sub-surface pump stroke extender

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Having motor-operated adjustment

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Details

74586, F15B 1522, F04B 3700

Patent

active

046533834

ABSTRACT:
The pump stroke extender adjusts the stroke of a polish rod normally clamped to a connector cable of an oscillating horse head for operating a sub-surface oil well pump. The extender includes a cylinder having its sides, in the preferred embodiment, connected to the double cables (connector cable) from the horse head and a piston portion clamped to the polish rod. A source of hydraulic fluid connects to the cylinder and appropriate valving arrangements cause in-flow of fluid to the cylinder to extend the piston portion from the cylinder as the polish rod approaches one end of its stroke. Hydraulic fluid is drained from the cylinder as the polish rod approaches the opposite end of its stroke. The overall stroke length of the pump can thus be extended by the travel distance of the piston relative to the cylinder, or, alternately, can be decreased by the travel distance of the piston relative to the cylinder.

REFERENCES:
patent: 2715389 (1955-08-01), Johnson
patent: 3102486 (1963-09-01), Griswold
patent: 4187765 (1980-02-01), Mattoon
patent: 4296678 (1981-10-01), Felder
patent: 4370901 (1983-02-01), Bolen
patent: 4498845 (1985-02-01), Pittman et al.

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