Method and apparatus for a combined exit guide and sectional...

Details Method and apparatus for a combined exit guide and sectional... Method and apparatus for a combined exit guide and sectional...

E - Fixed Constructions

21

B

E21B 7/08 (2006.01) E21B 29/00 (2006.01) E21B 29/06 (2006.01) E21B 43/11 (2006.01)

Patent

CA 2395746

A casing mill (82) is positioned below a whipstock (80) or other exit guide in a drill string assembly used to mill a section of steel casing below the whipstock (80) and which as the section mill (82) moves down and mills along the section of casing, causes the whipstock (80) to be lowered down adjacent the milled-out casing and allows the drill bit and drill string to be run along the surface of the whipstock (80) and into the earth formation. In an altemative embodiment, the combination of having the section mill (82) below the whipstock (80) is used in open hole operations having no casing.

Une fraise de tubage (82) est positionnée en dessous d'un sifflet déviateur (80) ou un autre guide de sortie dans un ensemble train de tiges utilisé pour fraiser une section en dessous du sifflet déviateur (80), et qui, lorsque la fraise de section (82) descend et fraise le long de la section de tubage, provoque l'abaissement du sifflet déviateur (80) de façon adjacente au tubage dégagé par fraisage et permet à la tête de trépan et au train de tige de passer sur la surface du sifflet déviateur (80) et de pénétrer dans la formation rocheuse. Selon un autre mode de réalisation, cette combinaison permettant de placer la fraise de section (82) en dessous du sifflet déviateur (80) convient aux exploitations à trou ouvert dépourvus de tubage.

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