Hybrid drill bit with high pilot-to-journal diameter ratio

Details Hybrid drill bit with high pilot-to-journal diameter ratio Hybrid drill bit with high pilot-to-journal diameter ratio

E - Fixed Constructions

21

B

E21B 10/14 (2006.01) E21B 10/62 (2006.01)

Patent

CA 2747434

The invention disclosed and taught herein are directed to an improved hybrid drill bit and associated elements having at least two frusto-conical cutter assemblies, each rotatable around separate axles on the bit, and at least two fixed blade cutters adjacent the frusto-conical cutter assemblies. The improved drill bit expands the pilot pin to journal diameter ratio within the body of the frusto-conical cutter assembly, but within the confines of the allowable space of the frusto-conical cutter assembly.

L'invention concerne un trépan hybride amélioré et des éléments associés, ayant au moins deux ensembles de découpe tronconiques, chacun tournant autour d'axes séparés sur le trépan, et au moins deux dispositifs de découpe à lame fixe, adjacents aux ensembles de découpe tronconiques. Le trépan amélioré augmente le rapport entre le diamètre du tourillon et celui du pilote dans le corps de l'ensemble de découpe tronconique, dans les limites de l'espace autorisé de l'ensemble de découpe tronconique.

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