F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/77.1
F15B 1/02 (2006.01) F04B 47/04 (2006.01)
Patent
CA 1196547
-1- Abstract: A jack pump of the type used to pump crude oil from oil wells. The jack pump comprises a reciprocating hydraulic motor fox operating sucker rods extending down the well to a down hole pump. The motor has a power stroke for lifting the sucker rods and a dissipating stroke allowing the sucker rods to fall again. The jack pump includes a variable displacement hydraulic pump, a gas-charged accumulator, a reservoir for hydraulic fluid and a hydraulic flow control circuit connecting the motor, pump, accumulator and reservoir. The flow control circuit allows the jack pump to operate as follows. During the power stroke of the hydraulic motor, pressurized fluid flows from the accumulator to the motor to operate the latter. During the dissipating stroke of the motor, fluid flows from the motor to the reservoir. During both the power stroke and the dissipating stroke, the pump operates continuously and under balanced load to charge hydraulic fluid from the reservoir to the accumulator.
405100
Kirby Eades Gale Baker
M.e.f. Holdings Ltd.
LandOfFree
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