Formation isolation valve adapted for building a tool string of

Details Formation isolation valve adapted for building a tool string of Formation isolation valve adapted for building a tool string of

1996-05-10

1998-09-22

Neuder, William P.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166323, 1663324, E21B 4312

Patent

active

058100873

ABSTRACT:
A formation isolation valve (FIV) method and apparatus is disclosed for building a tool string of any desired length prior to lowering that tool string downhole for the purpose of performing wellbore operations during a single trip into the wellbore. The formation isolation valve apparatus includes a valve, such as a ball valve, initially disposed in an open position and adapted to be changed from the open position to a closed position when a shifting tool is run through the center of the valve; and a hydraulic section including a rupture disc assembly and a pair of chambers separated by an oil metering orifice which is responsive to the previous closure of the valve by the run of the shifting tool through the center of the valve and is further responsive to the further running of the shifting tool through the center of the hydraulic section for changing the valve back from the closed position to the open position thereby reopening the valve when a predetermined internal tubing pressure inside the FIV exceeds a predetermined threshold pressure value rating of the rupture disc assembly.

REFERENCES:
patent: 4215746 (1980-08-01), Hallder et al.
patent: 4280561 (1981-07-01), Fredd
patent: 4356867 (1982-11-01), Carmody
patent: 4417600 (1983-11-01), Kohn
patent: 4420045 (1983-12-01), McMahan
patent: 4627492 (1986-12-01), Maclaughlin
patent: 4979569 (1990-12-01), Anyan et al.
patent: 5058673 (1991-10-01), Muller et al.
patent: 5090481 (1992-02-01), Pleasants et al.
patent: 5263683 (1993-11-01), Wong

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