Method for pumping a liquid from a well and apparatus for use th

Pumps – Motor driven – Fluid motor

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Details

91219, 60372, 60416, F04B 4704, F04B 4714

Patent

active

044065973

ABSTRACT:
A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings imposed upon the sucker rod at either extremity of its motion in conventional pumping methods. Hydraulically and mechanically-driven apparatus is disclosed for carrying out the method.

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