Window-cutting system for downhole tubulars

Details Window-cutting system for downhole tubulars Window-cutting system for downhole tubulars

E - Fixed Constructions

21

B

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

Patent

CA 2205004

A guide lug for a starting or window mill is provided at the upper end of the whipstock. A back-up shoulder is provided to act against any tendencies of the mill to whirl. A taper is provided for use in guiding the mill toward the casing for the cutting of the window. The lug is configured to be worn by a guide for the window mill or starter mill rather than being milled away. As a result of the use of the lug, the upper sections of the whipstock are protected from the mill. In turn, any holes or other projections provided for subsequent retrieval of the whipstock are functional for such a retrieval at the conclusion of the milling process for the window.

L'invention concerne une patte de guidage pour une fraise de départ ou de fenêtre, placée à l'extrémité supérieure du sifflet déviateur. Un épaulement de soutien sert à empêcher toute tendance de la fraise à tournoyer. Une partie conique sert à guider la fraise vers le cuvelage pour découper la fenêtre. La patte est conçue de façon à être portée par un élément de guidage pour la fraise de départ ou de fenêtre afin de ne pas être détruite par le fraisage. L'utilisation de cette patte permet de protéger les parties supérieures du sifflet déviateur vis-à-vis de la fraise. Tout trou ou toute partie saillante servant à récupérer ultérieurement le sifflet déviateur permet ainsi ce type de récupération à la fin de l'opération de fraisage de la fenêtre.

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