Retrievable packer assembly and system with releaseable body...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/1295 (2006.01)

Patent

CA 2551072

A releasable packer device and a method for selectively releasing a packer assembly from a set position in a wellbore. A packer assembly is described that incorporates a split body lock ring that is in ratcheting engagement with a central mandrel to secure the packer elements in a set position. In addition, there is a mechanical means for releasing the body lock ring from its locking position to an unlocked position. The body lock ring is released by radially expanding the ring by urging an axially-movable release sub with a releasing portion into contact with the body lock ring to unseat the ratcheting mechanism that retains the packer assembly in its set position.

L'invention concerne un dispositif de garniture d'étanchéité amovible et un procédé permettant de libérer sélectivement un ensemble garniture d'étanchéité d'une position déterminée dans un puits de forage. Un ensemble garniture d'étanchéité de l'invention comprend une bague de retenue de corps fendue encliquetée dans un mandrin central destinée à fixer l'élément garniture d'étanchéité dans une position déterminée. En outre, un moyen mécanique permet de libérer la bague de retenue de corps de sa position de verrouillage à une position non verrouillée. Ladite bague de retenue de corps est libérée par expansion radiale de la bague par application d'une contrainte sur une réduction de libération pouvant être déplacée dans le sens axial qui comprend une partie de libération en contact avec la bague de retenue de corps afin de désencliqueter le mécanisme d'encliquetage qui retient l'ensemble garniture d'étanchéité dans sa position déterminée.

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