Earth boring bit

Details Earth boring bit Earth boring bit

E - Fixed Constructions

21

B

E21B 10/42 (2006.01)

Patent

CA 2641204

The earth boring bit 10 is designed to bore an angular non- vertical hole into underlying strata. The bit 10 includes a plurality of steeply inclined cutting faces or edges 22 that define a relatively narrow included angle A therebetween. The bit's design ensures that the apex of the bit 10 will contact the surface S and/or other hard strata before the radially outwardly disposed gauge portion of the bit 10. This design reduces or obviates drill chattering or "walking" when the bit 10 is used to drill a hole at an angle that is not vertical relative to the surface or strata S. The bit 10 also includes an interchangeable flow control restrictor that optimizes the velocity of fluid pumped through the bit 10 and thus efficiently flushes debris from the hole as the hole is being drilled.

Le trépan (10) de forage de terrain selon l'invention est conçu pour forer un trou angulaire non vertical dans des couches de recouvrement. Le trépan (10) comporte une pluralité de faces raides inclinées ou bords (22) de coupe qui définit un angle inclus relativement étroit A entre ceux-ci. La conception du trépan permet que l'apex du trépan (10) entre en contact avec la surface S et/ou d'autres couches dures avant la partie de jauge disposée de façon radiale vers l'extérieure du trépan (10). Cette conception réduit ou dévie le broutage ou la <= marche >= du foret lorsque le trépan (10) est utilisé pour aléser un trou à un angle qui n'est pas vertical par rapport à la surface ou à la couche S. Le trépan comporte également un limiteur de commande de flux interchangeable qui optimise la vitesse du fluide pompé à travers le trépan (10) et évacue efficacement les débris du trou lorsque le trou est en cours d'alésage.

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