A drilling method and bit assembly to realize the method

Details A drilling method and bit assembly to realize the method A drilling method and bit assembly to realize the method

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 10/00 (2006.01) E21B 17/046 (2006.01)

Patent

CA 2207755

A method to drill a hole in the soil by a bit assembly and a bit assembly comprising a ring-shaped bit (2) to drill the outer circle of the hole and to which a protection tube system (4), mounted in the hole while drilling, is coupled, and a cylindric inner bit (1) to drill the center portion of the hole, from which bit at least the rotative motion is transmitted to the outer bit (2). Drilling by the outer bit (2) and pulling out the protection tube (4) are disconnected upon need by reverse rotation of the inner bit, whereafter drilling is continued with the inner bit (1) only.

Cette invention se rapporte à un procédé servant à forer un trou dans le sol à l'aide d'un ensemble trépan, ainsi qu'à un ensemble trépan, qui comprend un trépan de forme annulaire (2) servant à forer la circonférence externe circulaire du trou et auquel est couplé un système de tube de protection (4), monté dans le trou pendant l'opération de forage, ainsi qu'un trépan interne cylindrique (1) qui sert à forer la partie centrale du trou et à partir duquel au moins le mouvement de rotation est transmis au trépan externe. L'opération de forage par le trépan externe (2) et l'opération d'extraction du tube de protection (4) sont séparées lorsque c'est nécessaire, par rotation inverse du trépan interne, puis l'opération de forage est poursuivie à l'aide du trépan interne (1) uniquement.

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