Retrievable whipstock

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/00 (2006.01) E21B 7/06 (2006.01) E21B 7/08 (2006.01) E21B 23/01 (2006.01)

Patent

CA 2220779

A thru-tubing retrievable whipstock is disclosed. A running tool createsrelative movement to pivot out anchors at the lower end of the whipstock to accomplish its support. The setting force is trapped by spring-loaded wedges. The whipstockcan be released and retrieved through tubing by undermining the wedges which allows retrieval of the whipstock by a pick-up force on the whipstock which collapses the anchoring mechanism for retrieval of the entire assembly to the surface.

Présentation d'un sifflet déviateur récupérable à insérer dans le tubage. Un outil de pose crée un mouvement relatif pour faire pivoter vers l'extérieur des ancrages à l'extrémité inférieure du sifflet déviateur, afin de lui servir de support. La force de mise en place est emmagasinée par des coins à ressort. Le sifflet déviateur peut être libéré et récupéré en passant par le tubage en soulevant les coins, ce qui permet sa récupération grâce à l'application d'une force de repêchage qui s'exerce sur lui. Cette force provoque la rentrée du mécanisme d'ancrage pour permettre ainsi la récupération du dispositif complet jusqu'à la surface.

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