Method and system for circulating a gas bubble from a well

Details Method and system for circulating a gas bubble from a well Method and system for circulating a gas bubble from a well

1979-10-09

1981-03-03

Novosad, Stephen J.

Boring or penetrating the earth

Automatic control

Of fluid pressure below ground

175 38, 175 48, 175218, E21B 700, E21B 2108, E21B 4706

Patent

active

042535301

ABSTRACT:
A gas bubble is circulated from a well by a system that maintains the well and bottom hole pressure substantially constant by progressively increasing the casing pressure as needed to maintain the drill pipe pressure substantially constant. An incrementally increasing casing pressure reference signal is produced by detecting each occurrence of the drill pipe pressure falling a predetermined amount below a drill pipe pressure reference signal. The casing pressure reference signal is compared with the actual casing pressure. A throttling valve is closed a corresponding amount if the acutal casing pressure is less than the casing pressure reference signal. The throttling valve is opened a corresponding amount if the actual casing pressure is greater than the casing pressure reference signal.

REFERENCES:
patent: 3362487 (1968-01-01), Lindsey
patent: 3443643 (1969-05-01), Jones
patent: 3470971 (1969-10-01), Dower
patent: 3470972 (1969-10-01), Dower
patent: 3477526 (1969-11-01), Jones et al.
patent: 3550696 (1970-12-01), Kenneday
patent: 3677353 (1972-07-01), Baker
patent: 3693732 (1972-09-01), Sabi
patent: 3827511 (1974-08-01), Jones

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