Multi-cycle isolation valve and mechanical barrier

Details Multi-cycle isolation valve and mechanical barrier Multi-cycle isolation valve and mechanical barrier

2011-08-30

2011-08-30

Gay, Jennifer H (Department: 3676)

Wells

Processes

Placing or shifting well part

C166S332400, C166S332800

Reexamination Certificate

active

08006772

ABSTRACT:
A method for performing a wellbore-related activity may include positioning a sealing device along the wellbore; conveying a work string into the wellbore; using the work string to perform the activity; extracting the work string out of the wellbore; and shifting the sealing device to a closed position to seal a bore of the wellbore using a portion of the work string. A device that selectively seals or occludes a wellbore tubular may include a sealing device having a first and a second sealing element that seal a bore of the wellbore tubular. The first and second sealing elements may support a pressure applied in different directions. Pulling an engagement sleeve with the work string in an uphole direction may fold the first and second sealing elements into the closed position. The bore may be unsealed by applying a pressure cycle to shift the sealing device.

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