Optimized central PDC cutter and method

Details Optimized central PDC cutter and method Optimized central PDC cutter and method

2008-07-18

2010-11-30

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S431000

Reexamination Certificate

active

07841427

ABSTRACT:
A drill bit, insert and method useful for subterranean drilling, or forming boreholes in subterranean formations is provided. More particularly, a more efficient cutting structure and method is provided in the central portion of a PDC drill bit. The present invention provides a drill bit, insert and method having a central cutting portion with a more normalized angle of attack. The drill bit of the present invention provides for various attack angles much closer to the optimum side rake.

REFERENCES:
patent: 3720273 (1973-03-01), McKenry et al.
patent: 4907662 (1990-03-01), Deane et al.
patent: 5074729 (1991-12-01), Oba
patent: 6315066 (2001-11-01), Dennis

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