Bit assembly

Details Bit assembly Bit assembly

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 10/64 (2006.01) E21B 17/046 (2006.01)

Patent

CA 2693781

A bit assembly in a drilling apparatus working by hammering and /or rotating said assembly comprising of a pilot bit (1) drilling the central part of the hole and a ring bit (2), fitted in connection with said pilot bit(1) and furnished with cylindrical inner surface drilling the outer surface of said hole, and further, between the pilot bit (1) and ring bit (2) a blocking arrangement of mutual rotation and axial movement, whereby opening of said blocking arrangement makes it possible to pull the pilot bit (5) off the hole, while ring bit (2) remains in the hole, and the bit assembly comprises a casing tube and its extension (6) and an interlocking system, which is through a ring-shaped device (8) from the extension (6) of the casing tube adapted to transfer pulling force from the pilot or ring bit to the casing tube extension (6) and said interlocking system can be opened in order to continue drilling with the ring and pilot bits (1, 2) when the casing tube remains in its place. That the ring like device (8) comprises parts directed to the inside, by means of which said device is permissively fitted to rotate into the traverse groove (10) on the outer surface of either the pilot or ring bit so that its motion is limited or blocked, in both axial directions.

La présente invention concerne un ensemble foret dans un appareil de forage, qui fonctionne en martelant et/ou en faisant tourner ledit ensemble, qui est constitué d'un foret pilote (1) qui fore la partie centrale du trou et un foret annulaire (2), raccordé audit foret pilote (1) et équipé d'une surface intérieure cylindrique qui fore la surface extérieure dudit trou, et en outre, entre le foret pilote (1) et le foret annulaire (2), un agencement de blocage de mouvement mutuel de rotation et axial, moyennant quoi l'ouverture dudit agencement de blocage permet de tirer le foret pilote (5) à partir du trou, alors que le foret annulaire (2) reste dans le trou, et l'ensemble foret comprend un chemisage et son extension (6) et un système d'enclenchement qui se trouve dans un dispositif annulaire (8) à partir de l'extension (6) du chemisage conçu pour transférer la force de traction du foret pilote ou foret annulaire vers l'extension du chemisage (6), et ledit système d'enclenchement peut être ouvert afin de continuer de forer avec les forets annulaire et pilote (1, 2) lorsque le chemisage reste en place. Le dispositif annulaire (8) comprend des pièces orientées vers l'extérieur au moyen desquelles ledit dispositif peut être adpaté de façon à tourner dans la rainure transversale (10) de la surface extérieure du foret pilote ou du foret annulaire de sorte que son mouvement soit limité ou bloqué, dans les deux directions axiales.

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