Title: Pumping jack

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Abstract: A pumping jack for use with a well having a vertically reciprocable polish rod has a base including a horizontally extending table. A hydraulic cylinder is mounted on the base, with the cylinder axis extending parallel to and above the table. A plunger is reciprocable in the cylinder along the axis and carries with it a block including a first sheave around which a first flexible line is reeved. One end of the first line is affixed to the base, and the other end of the first line extends around a well sheave mounted on the base with the well sheave periphery tangent to the polish rod, the line from the well sheave being affixed to the polish rod. The reciprocating parts are balanced at least in part in either of two ways. In one way, there is a pneumatic chamber variable in volume in accordance with the reciprocation of the polymer and provided with air under an elevated pressure sufficient to counterbalance or offset part of the reciprocating load. In the other way, the plunger carries a second sheave around which a second line is reeved, one end of the second line being secured to the base, and the other end of the second line being reeved around a weight sheave mounted on the base. A weight is secured to the end of the second line depending from the second sheave and has a mass to offset or counterbalance at least part of the reciprocating load. Thus, at least part of the weight of the polish rod and the pumping loads on it is counterbalanced either pneumatically or by gravity or both.


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