Wells – Processes – Placing or shifting well part
Reexamination Certificate
2006-08-08
2006-08-08
Bagnell, David (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S123000, C166S125000, C166S181000, C166S182000, C175S230000
Reexamination Certificate
active
07086481
ABSTRACT:
The present invention relates to an apparatus and method for isolating a wellbore condition such as formation pressure during a wellbore operation. The invention has particular application in connection with underbalanced drilling. In one arrangement, a formation isolation apparatus is provided that serves as a selectively actuatable plug. The plug in one aspect is selectively set and released by a setting/releasing tool. The setting/releasing tool includes a system for setting the plug in the wellbore, and a system for releasing the plug from the wellbore. The setting/releasing tool is releasably connected to the plug. Thus, after the plug has been set, the setting/releasing tool may be removed from the wellbore. The plug includes a flapper valve that is restrained in its open position by the setting/releasing tool. Removal of the setting/releasing tool from the wellbore allows the flapper valve to close, thereby isolating pressures in the wellbore below the flapper valve. The plug is wireline retrievable. In another aspect, a formation isolation apparatus is provided for use during sidetrack drilling operations. The sealing element is movable from a first released position below the lateral wellbore, to a set position above the lateral wellbore.
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Hosie David
Luke Mike A.
Bagnell David
Collins Giovanna M
Patterson & Sheridan LLP
Weatherford/Lamb
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