Pneumatic well casing pressure regulating system

Details Pneumatic well casing pressure regulating system Pneumatic well casing pressure regulating system

1985-11-14

1987-10-20

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

13762415, 175 25, E21B 3408

Patent

active

047007397

ABSTRACT:
A pneumatic pressure regulating system controls a choke having a hydraulic operator actuator for selectively opening or closing the choke to control pressure in a well casing. The system applies periodic pulses of pneumatic pressure for opening an output valve in one direction when the actual casing pressure is greater than a selected control pressure for opening the choke, and applies periodic pulses of pneumatic pressure for opening the output valve in another direction when casing pressure is less than the set pressure for closing the choke. The interval between sucessive pulses is adjusted to be long enough for the pressure in the casing to equilibrate before the next pulse occurs.

REFERENCES:
patent: 4481768 (1984-11-01), Goshorn

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