Dynamically stable hybrid drill bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/14 (2006.01) E21B 10/26 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2730944

An earth-boring drill bit comprising a bit body configured at its upper extent for connection into a drillstring is described. A selected number of fixed blades extend downward from the bit body, and a selected number of rolling cutters are mounted for rotation on the bit body. A plurality of rolling- cutter cutting elements are arranged on each rolling cutter and a plurality of fixed-blade cutting elements are arranged on each fixed blade. In accordance with aspects of the present disclosure, the selected number of fixed blades exceeds the selected number of rolling cutters by at least one.

L'invention porte sur un trépan de forage de la terre comprenant un corps de trépan configuré dans sa partie supérieure pour une liaison à un train de tige. Un nombre sélectionné de lames fixes s'étendent vers le bas à partir du corps de trépan, et un nombre sélectionné de molettes sont montées pour une rotation sur le corps de trépan. Une pluralité d'éléments de coupe de molette sont agencés sur chaque molette et une pluralité d'éléments de coupe de lame fixe sont agencés sur chaque lame fixe. Selon des aspects de la présente invention, le nombre sélectionné de lames fixes dépasse le nombre sélectionné de molettes d'au moins un.

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