Dynamically stable hybrid drill bit

Details Dynamically stable hybrid drill bit Dynamically stable hybrid drill bit

2008-07-25

2010-10-26

Wright, Giovanna C (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S376000, C175S431000

Reexamination Certificate

active

07819208

ABSTRACT:
An earth-boring bit comprising a bit body configured at its upper extent for connection into a drillstring. 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. The selected number of fixed blades exceeds the selected number of rolling cutters by at least one.

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