Method and apparatus for directional boring

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 4/14 (2006.01) E21B 7/06 (2006.01) E21B 10/56 (2006.01) E21B 47/02 (2006.01)

Patent

CA 2366115

A drill head for an apparatus for directional boring according to the invention includes a bit, a holder for a device for detecting angular orientation of the bit, and a hammer including a striker for delivering impacts to the bit, wherein the bit assembly, holder and hammer are connected head to tail with the bit at a front end. The bit of the invention has a frontwardly facing main cutting surface having a plurality of main cutting teeth disposed thereon and a gage tower extending radially outwardly from the main cutting surface, which gage tower has at least one frontwardly facing gage gutting tooth thereon suitable for cutting over an angle defined by less than a full rotation of the bit. The device for detecting angular orientation is in a predetermined alignment with the gage tower so that it determines the orientation of the gage tower relative to the axis of rotation of the drill head.

L'invention concerne une tête de forage pour appareil de forage dirigé comprenant un trépan, un support pour un dispositif servant à détecter l'orientation angulaire du trépan, et un marteau comprenant un percuteur pour frapper le trépan. L'ensemble trépan, le support et le marteau sont connectés bout à bout, le trépan étant situé à l'extrémité avant. Le trépan possède une surface de coupe avant principale comportant plusieurs dents coupantes et une tour de jaugeage s'étendant radialement vers l'extérieur de la surface de coupe principale. La tour de jaugeage possède au moins une dent coupante de jaugeage avant adaptée pour couper un angle défini par moins d'une rotation complète du trépan. Le dispositif de détection de l'orientation angulaire est en position d'alignement prédéterminé avec la tour de jaugeage de manière à déterminer l'orientation de la tour de jaugeage par rapport à l'axe de rotation de la tête de forage.

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