Method for casing drilling, drilling unit and adapter device

Details Method for casing drilling, drilling unit and adapter device Method for casing drilling, drilling unit and adapter device

E - Fixed Constructions

21

B

E21B 19/16 (2006.01) E21B 7/20 (2006.01)

Patent

CA 2589788

The invention relates to a method for casing drilling, a drilling unit and an adapter device. The adapter device (20) to be used in extension drill equipment drilling comprises an inner piece (21) which can be rotated by the rotation device (9) of the rock drilling machine (7). Around the inner piece, there is an outer piece (22) which can be moved in the axial direction with respect to the inner piece. By changing the axial position of the outer piece, it can be selected whether the rotation force is directed from the rotation device to the inner rod (10) or to the outer tube (13) used in casing drilling during threading.

L~invention concerne une méthode de forage à tubage, une unité de forage et un dispositif adaptateur. Le dispositif adaptateur (20) à utiliser en forage avec équipement de forage à extensions comporte une pièce interne (21) qui peut être pivotée par le dispositif de rotation (9) de la machine à forer le roc (7). Autour de la pièce interne, il y a une pièce externe (22) qui peut être déplacée dans le sens axial par rapport à la pièce interne. En changeant la position axiale de la pièce externe, il est possible de sélectionner si la force de rotation doit être dirigée du dispositif de rotation vers la tige interne (10) ou vers le tube externe (13) utilisé dans le forage à tubage lors du filetage.

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