Rock bit back reaming inserts

Details Rock bit back reaming inserts Rock bit back reaming inserts

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) E21B 10/00 (2006.01) E21B 10/26 (2006.01) E21B 10/52 (2006.01)

Patent

CA 2140830

A means to back ream a hole drilled with a roller cone drill bit is disclosed. Protruding hard metal cutting inserts are affixed on the upper outside diameter taper of each of the bit legs. If the borehole closes to a smaller diameter than the bit gage diameter or loose rock rubble packs around the upper portion on the bit, the protruding cutting inserts fixed on the upper bit leg taper can back ream the hole by lifting and rotating the bit.

Dispositif servant à aléser vers l'arrière un trou foré au moyen d'un trépan tricône. Des inserts de coupe de métal dur en saillie sont fixés sur le cône du diamètre extérieur supérieur de chaque branche de trépan. Si le trou de forage se ferme à un diamètre inférieur à celui de la jauge à trépan ou si un éboulis de roches détachées se remblaie autour de la partie supérieure du trépan, les inserts de coupe en saillie fixés sur le cône de branche de trépan supérieur peuvent aléser vers l'arrière le trou en élevant et en faisant tourner le trépan.

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