Ningbo Sunter Machinery Co., Ltd.
Hydraulic Pump Jack
Ningbo Sunter is a recognized manufacturer who specializes in kinds of hydraulic tools,including hydraulic cylinder,Hydraulic Jack,Hydraulic Pump,Hydraulic Wrench,Hydraulic Puller,Hydraulic Pusher and Hydraulic Accessories.
The claims defining the invention are as follows:
1. A hydraulic pump jack for hydraulically actuated well pumps of the general type having pistons driven in one direction to lift liquid up a delivery pipe and having the pistons returned by liquid in a control pipe to recharge the said pump, characterised by a double-acting pump having a first pump section arranged to be coupled to the said liquid delivery pipe extending up the well, and a second pump section arranged to be coupled to the said pump control pipe which also extends up the well, fluid actuated valve means in the said delivery pipe to normally stop outflow from the said delivery pipe, and means coupling the said control pipe to the said valve means to actuate the said control valve to allow an outflow of liquid from the said delivery pipe when the said control pipe is pressurised during the pressure stroke of the said first pump section.
2. A hydraulic pump jack for hydraulically actuated well pumps of the general type having pistons driven in one direction to lift liquid up a delivery pipe and having the pistons returned by liquid in a control pipe to recharge the said pump, comprising first and second pump cylinders with pistons therein interconnected to be oppositely actuated, said first pump cylinder being adapted to be connected to communicate with the said control pipe of a remote liquid delivery pump, and second pump cylinder being adapted to be connected to the said liquid delivery pipe of the said remote liquid delivery pump, and normally closed valve means connected to receive liquid from the said first pump cylinder to open the said valve means by liquid pressure, said valve means being positioned in the said delivery pipe and arranged to be opened to allow flow from the said liquid delivery pipe when the said control pipe is pressurised during the delivery stroke of the said well pump.
3. A hydraulic pump jack according to claim 1 wherein the said jack comprises a liquid reservoir having the said first and second cylinders submerged in it, said cylinders having facing open ends spaced apart, a pair of pistons in said cylinders interconnected by a connecting rod, means to reciprocate the said rod, an outlet from said first cylinder to a control pipe having a relief valve discharging back into said reservoir, and an outlet from the said second cylinder to a liquid delivery pipe and having a relief valve discharging back into said reservoir.
4. A hydraulic pump jack according to claim 1 wherein the said valve means comprise:
a secondary cylinder connected at one end to the said control pipe and at the other end to the said liquid discharge pipe,
a piston within the said secondary cylinder remote from the end connected to the said liquid discharge pipe,
a liquid flow control valve in the said secondary cylinder connected to move with the said piston and adapted to engage a seat in the said secondary cylinder arranged to allow flow from the said liquid discharge pipe when liquid pressure is applied to the said piston from the said control pipe, said valve being urged into a closed position by a spring.
5. A hydraulic pump jack according to claim 2 or 3 wherein the said valve means comprise
a secondary cylinder connected at one end to the said control pipe and at the other end to a chamber connectable with the said liquid outlet pipe,
a piston in the said secondary cylinder in communication with the said control pipe,
a valve in the said secondary cylinder between the said chamber and an outlet from the said cylinder,
said control pipe passing through the said chamber and into said liquid outlet pipe,
said piston being connected to the said valve and loaded by spring means to urge the said valve into a closed position, and
a pipe connecting the said chamber with the outlet of the said second cylinder to cause liquid to flow into the said chamber when the piston in the said second cylinder is advanced to pressurise liquid in the delivery pipe.
6. A hydraulic pump jack and pump combination arranged to be interconnected by a liquid delivery pipe and a pump control pipe comprising a surface unit having first and second pump section cylinders with pistons therein interconnected to be oppositely actuated, means to connect said first pump section to said control pipe, means to connect said second pump section to said liquid delivery pipe, and a valve connected to said control pipe to allow outflow of liquid from said liquid delivery pipe when said control pipe is pressurised, means to urge said valve closed to prevent outflow of liquid from said liquid delivery pipe when liquid is forced down said delivery pipe, and a remote unit arranged as a liquid delivery pump positionable in said well having a pair of double-acting cylinders with pistons therein coupled through a hollow connecting rod, said control pipe being connected to a first of said double-acting cylinders to force the piston therein outward to expel liquid from its other side into the said delivery pipe, said delivery pipe being connected to the other end of said first cylinder, a foot valve in said second of said double-acting cylinders to allow the cylinder to be charged with liquid when liquid is forced down the said liquid delivery pipe to move the said coupled pistons outwards, and valve means and at least a port in the said hollow connecting rod to force liquid from the second of said cylinders through the said hollow connecting rod into said delivery pipe, whereby liquid taken into said second cylinder is discharged through the said valve means of the said surface unit when liquid is urged down the said control pipe.