06230828 is referenced by 27 patents and cites 20 patents.

A PDC-equipped rotary drag bit especially suitable for directional drilling. Cutter chamfer size and backrake angle, as well as cutter backrake, may be varied along the bit profile between the center of the bit and the gage to provide a less aggressive center and more aggressive outer region on the bit face to enhance stability while maintaining side cutting capability, as well as providing a high rate of penetration under relatively high weight on bit.

Title
Rotary drilling bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics
Application Number
8/925525
Publication Number
6230828 (B1)
Application Date
September 8, 1997
Publication Date
May 15, 2001
Inventor
Rudolf C O Pessier
Houston
TX, US
Michael P Ohanian
Slidell
LA, US
James A Norris
Sandy
UT, US
Steve R Matson
Spring
TX, US
Roland Illerhaus
The Woodlands
TX, US
Roger Fincher
Conroe
TX, US
Mark W Dykstra
Kingwood
TX, US
Christopher C Beuershausen
Lafayette
LA, US
Agent
Trask Britt
US
Assignee
Baker Hughes Incorporated
TX, US
IPC
E21B 10/46
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