Pressure-operated oil and gas well swabbing device

Details Pressure-operated oil and gas well swabbing device Pressure-operated oil and gas well swabbing device

1988-07-20

1991-01-22

Croyle, Carlton R.

Pumps

Drilled well free piston-type pump

Having condition or position responsive control of pump...

417 58, 417 60, 4175552, F04B 4712

Patent

active

049867270

ABSTRACT:
An oil well swabbing device having a pressure activated valve for use in closing a fluid passage therein when the swabbing device is submerged under liquid in a well casing corresponding to a predetermined valve closing pressure; the pressure-activated valve comprising a pressure collapsible bladder such as a bellows or diaphragm, a valve and seat interposed in the fluid passage, and an actuator rod connecting the valve to the pressure collapsible bladder such that the valve is closed when the bladder is collapsed to a degree corresponding to the predetermined valve closing pressure. Improved speed brakes, catchers, and position indicators for oil well swabbing devices are also disclosed.

REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2555112 (1951-05-01), Brown
patent: 4070134 (1978-01-01), Gramling
patent: 4712981 (1987-12-01), Gramling

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