Pressure operated isolation valve for use in a well testing and

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

1975-06-20

1976-06-22

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

166224A, 166264, E21B 4300, E21B 4900

Patent

active

039645444

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 and for maintaining the isolation of the spring force during subsequent interior bore pressure increases such as during formation treating operations. An isolation 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. Uni-directional acting means is provided in the isolation valve responsive to the interior bore pressure such that when the interior bore pressure is increased subsequent to the closing of the isolation valve, the uni-directional acting means will not cuase the isolating valve to reopen, but will nullify the effect of the subsequent pressure increase such that the valve will remain closed. The opening force is provided by compressing a spring when the valve is closed, thus allowing the isolation valve to reopen when the pressure in the annulus is returned to hydrostatic. An isolation valve is provided which is normally open, which closes only after the well annulus pressure exceeds a reference presssure trapped in the bore of the testing tool by a predetermined amount, and which remains closed during subsequent pressure increases in the bore of the testing tool.

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.

Affiliated with

Also associated with

Rating

Pressure operated isolation valve for use in a well testing and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pressure operated isolation valve for use in a well testing and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure operated isolation valve for use in a well testing and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2283370