E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/14 (2006.01)
Patent
CA 2431618
A shoe (10) for guiding a string within a well-bore is described. The shoe comprises an annular body (12) of relatively hard material and a nose portion (16) of relatively soft material which are interlocked so that when the nose portion is drilled through, any remaining parts are held against the annular body. Interlocking is achieved by a dovetail thread (30). Embodiments are described for the shoe as a reamer shoe and as a drill bit to run in casing.
L'invention concerne un sabot (10) permettant de guider un train de sonde dans un orifice de puits. Ce sabot est pourvu d'un corps annulaire (12) dans un matériau relativement dur et d'une section de nez (16) dans un matériau relativement souple qui sont verrouillés de manière à ce que, lorsque le matériau foré passe par la section de nez, toutes les autres parties sont maintenues contre le corps annulaire. On réalise le verrouillage grâce à un filetage à queue d'aronde (30). Selon les modes de réalisation, le sabot se présente sous la forme d'un sabot d'alésage et d'un outil de forage afin de fonctionner dans un tubage.
Marks & Clerk
Weatherford/lamb Inc.
LandOfFree
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