Hybrid drill bit with fixed cutters as the sole cutting...

Details Hybrid drill bit with fixed cutters as the sole cutting... Hybrid drill bit with fixed cutters as the sole cutting...

2007-04-05

2010-11-30

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

07841426

ABSTRACT:
A hybrid drill bit having both roller cones and fixed blades is disclosed. The cutting elements on the fixed blades form a continuous cutting profile from the perimeter of the bit body to the axial center. The roller cone cutting elements overlap with the fixed cutting elements in the nose and shoulder sections of the cutting profile between the axial center and the perimeter. The roller cone cutting elements crush and pre-fracture formation in the weak and highly stressed nose and shoulder sections.

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