Expandable whipstock anchor assembly

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/08 (2006.01) E21B 29/06 (2006.01)

Patent

CA 2516074

A whipstock assembly includes a tubular anchor 36 which is expanded into engagement with the casing string 8, and a tubular expander 24 which is forcibly moved into the tubular anchor to expand the tubular anchor downhole into secure engagement with the casing string. The tubular anchor and tubular expander remain downhole. An orientation sleeve 18 at the upper end of the expander 24 includes an orientation surface 20. A whipstock 70 engages the sleeve 18 to orient the whipstock face for diverting a tool into a hole in the side of the casing string. Once the whipstock 70 is removed from the well, the orientation sleeve may receive a sealing nipple 130 at the lower end of a production tubing string.

Sifflet déviateur comprenant une ancre tubulaire (36) de forme allongée pour s'engager avec une colonne de tubage (8) et une expansion tubulaire (24) qui est introduite de force dans l'ancre tubulaire pour prolonger cette dernière dans le trou afin de s'engager fermement avec la colonne de tubage. L'ancre tubulaire et l'expansion tubulaire demeurent dans le trou. Un manchon d'orientation (18) et l'extrémité supérieure de l'expansion (24) comportent une surface d'orientation (20). Un sifflet déviateur (70) s'engage dans le manchon (18) pour orienter la façade du sifflet pour faire dévier un outil dans le trou sur le côté de la colonne de tubage. Lorsque le sifflet déviateur (70) est retiré du puits, le manchon d'orientation peut recevoir une duse d'obturation (130) sur l'extrémité inférieure de la colonne de production.

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