Method and apparatus for annulus pressure responsive circulation

Details Method and apparatus for annulus pressure responsive circulation Method and apparatus for annulus pressure responsive circulation

1975-01-13

1976-07-20

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166 5, 166315, 166224R, E21B 2100, E21B 4706

Patent

active

039701476

ABSTRACT:
A releasably locked closed circulation valve is introduced into a well bore as part of a drill string. The annulus between the drill string and the well bore, or casing affixed to the well bore, is sealed. Pressure is applied to the annulus and the valve unlocks and opens once the annulus pressure reaches a certain level to allow circulation between the annulus and the interior of the drill string. An optional locking device preferably locks the opened valve in the open position. A second embodiment includes a tester valve simultaneously operable with the circulation valve.

REFERENCES:
patent: 2591087 (1952-04-01), Millican
patent: 2855952 (1958-10-01), Tausch et al.
patent: 3025919 (1962-03-01), Angel et al.
patent: 3358771 (1967-12-01), Berryman
patent: 3583481 (1971-06-01), Vernotzy
patent: 3664415 (1972-05-01), Wray et al.
patent: 3749119 (1973-07-01), Tausch et al.
patent: 3750752 (1973-08-01), Mott
patent: 3796261 (1974-03-01), Nutter
patent: 3814182 (1974-06-01), Giroux
patent: 3823773 (1974-07-01), Nutter

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