Pressure operated isolation valve for use in a well testing appa

Details Pressure operated isolation valve for use in a well testing appa Pressure operated isolation valve for use in a well testing appa

1975-06-20

1976-08-24

Novosad, Stephen J.

Wells

Processes

Sampling well fluid

166315, 166224A, 166 5, E21B 3310, E21B 4700

Patent

active

039761363

ABSTRACT:
In a well testing tool having a spring whose biasing force is supplemented by the hydrostatic pressure in the well annulus at the testing depth, a method and apparatus for isolating the spring from the pressure in the well annulus utilizing the pressure differential between the well annulus and the testing tool bore which exists after the formation is isolated. An insolation valve is provided whose closing force is generated by isolating the testing tool bore from the well annulus, and then increasing the well annulus pressure above the hydrostatic pressure. The pressure differential thus created is utilized to close the valve. The opening force is generated by compressing a spring as the valve is closed. Thus, an isolation valve is provided which is normally open and which closes only after the well annulus pressure exceeds a reference pressure trapped in the bore of the testing tool by a predetermined amount.

REFERENCES:
patent: 2951536 (1960-09-01), Garrett
patent: 3410346 (1968-11-01), Garrett et al.
patent: 3459264 (1969-08-01), Olson et al.
patent: 3500911 (1970-03-01), Farley et al.
patent: 3664415 (1972-05-01), Wray et al.
patent: 3696868 (1972-10-01), Taylor, Jr.
patent: 3717203 (1973-02-01), Kirkpatrick et al.
patent: 3827494 (1974-08-01), Crowe
patent: 3856085 (1974-12-01), Holden et al.
patent: 3858649 (1975-01-01), Wray et al.

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