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US 4,099,447 AGranted
Hydraulically operated oil well pump jack
AssigneeAda Pumps, Inc.
InventorEthridge F. Ogles
Life of this patent
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AssigneeAda Pumps, Inc.
InventorEthridge F. Ogles
Estimating the term…
A hydraulically operated oil well pump jack utilizing a double acting hydraulically operated piston and cylinder assembly for pivoting the walking beam of an oil well pump jack, a linkage mechanism for operating a reversing valve to cause extension and retraction of the piston and cylinder assembly for oscillating the beam about a saddle bearing at the upper end of a stanchion or samson post together with a crossover cushioning device for controlling acceleration and deceleration of the oscillating walking beam to reduce abrupt tension forces exerted on the polish rod and sucker rods and also reduce impact forces on the oil well pump jack during oscillation of the walking beam. The oil well pump jack is adapted for use in removing or installing the polish rod, sucker rods, pump and production tubing by utilizing a gin pole assembly which includes a pair of lift cables alternately used for lifting or lowering the components with ratchet winches being provided for alternately taking up slack cable or paying out cable when slack with the walking beam including a pulley engaging each of the cables to effectively lengthen and shorten the length of the cables during oscillation of the walking beam.
In combination, a pump jack for well pumps comprising a support, a beam mounted on said support for pivotal movement about a generally horizontal transverse axis, a horsehead at one end of said beam for connection with a polish rod of a well pump, a hydraulic fluid pressure operated piston and cylinder assembly connected to said beam for powering the beam about its pivot axis, a counterbalance weight on said beam on the opposite side of the transverse axis from the horsehead, said piston and cylinder assembly being powered from a hydraulic pump having a separate conduit connected to each end of the cylinder, a reversing valve communicating the pump with the conduits, and means interconnecting the reversing valve and the beam for controlling the position of the reversing valve in response to extension and retraction of the piston and cylinder assembly, said means controlling the reversing valve including a mechanical linkage, said linkage including adjustment means enabling variation in the stroke of the piston and cylinder assembly, each of said conduits including means cushioning high pressure hydraulic fluid moving from the reversing valve to the piston and cylinder assembly for cushioning movement of said beam, each of said cushioning means including a cylinder communicated at one end with said conduit, a piston movable in said cylinder in peripherally sealed relation thereto whereby said piston will move longitudinally in the cylinder in response to pressure changes in the conduits for cushioning movement of the hydraulic fluid in the conduits.
In combination, a pump jack for well pumps comprising a support, a beam mounted on said support for pivotal movement about a generally horizontal transverse axis, a horsehead at one end of said beam for connection with a polish rod of a well pump, a hydraulic fluid pressure operated piston and cylinder assembly connected to said beam for powering the beam about its pivot axis, a counterbalance weight on said beam on the opposite side of the transverse axis from the horsehead, and hydraulic power means longitudinally adjusting the counterbalance weight along the beam, said power means also serving to adjust the point of connection between the beam and the piston and cylinder assembly longitudinally of the beam.
In combination, a pump jack for well pumps comprising a support, a beam mounted on said support for pivotal movement about a generally horizontal transverse axis, a horsehead at one end of said beam for connection with a polish rod of a well pump, a hydraulic fluid pressure operated piston and cylinder assembly connected to said beam for powering the beam about its pivot axis, a counterbalance weight on said beam on the opposite side of the tranverse axis from the horsehead, and a gin pole attached to said support and extending alongside of the horsehead to a height substantially above the horsehead, lift cable means engaged with the beam and supported by the upper end of the gin pole and operative to pull the polish rod, sucker rods, pump, or production tubing from the oil well.
In a pump jack for well pumps in which the jack includes a base with an upstanding support, a beam mounted on said support for pivotal movement about a generally horizontal transverse axis, means at one end portion of the beam for connection with a pump operating rod, counterbalance means connected with the beam, hydraulic fluid pressure operated piston and cylinder means connected to said beam for pivoting said beam and reciprocating said pump operating rod, reversing valve means communicating said piston and cylinder means with a source of pressurized hydraulic fluid through hydraulic fluid pressure conduits, and means controlling operation of said reversing valve in response to pivotal movement of said beam, that improvement comprising cushioning means in each hydraulic fluid pressure conduit for cushioning movement of said beam adjacent both extreme positions of the beam during its pivotal movement, each of said cushioning means including a cylinder and piston freely movable therein, each cylinder having one end communicating with one of said conduits and the opposite end communicating with the other of said conduits whereby increase in pressure in one of said conduits will cause an increase in pressure in the other conduit through movement of the piston.
Dependencies are inferred from the claim text.