Guide tube with threaded ends and waist

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/00 (2006.01) E21B 17/042 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2426020

The present invention relates to a guide tube and a drill string suitable for mechanical handling in a rig for percussive top hammer rock drilling. The guide tube has an outer diameter (D) which is substantially constant along the axial extension of the tube and comprises a female thread in a sleeve in a first end and a male thread at a second end as well as a flush channel extending throughout the tube. The sleeve has an axial length (L1). The guide tube comprises a cylindrical waist in the vicinity of the first end. The waist has an axial extension (L2) that is longer than the axial length (L1) of the recess.

La présente invention concerne un tube de guidage et un train de tiges adaptés aux manipulations mécaniquement dans un appareil de forage destiné au forage de roches. Le tube de guidage (10) présente un diamètre extérieur (D) sensiblement constant sur la longueur axiale du tube et il comprend un filetage femelle (16) formé dans un évidement (32) ménagé dans une première extrémité (11) et un filetage mâle (15) formé à une seconde extrémité (13) ainsi qu'un canal de rinçage traversant (19) permettant d'acheminer le milieu de rinçage jusqu'à un trépan de forage de roches pour forage par percussion au marteau-perforateur. L'évidement présente une longueur axiale (L1). Le tube de guidage (10) comprend une taille cylindrique (23) à proximité de la première extrémité (11). La taille (23) présente une extension axiale (L2) plus longue que la longueur axiale (L1) de l'évidement (32).

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