05467836 is referenced by 91 patents and cites 38 patents.

An earth-boring bit of the fixed cutter variety is provided with hard gage inserts that protrude from the gage surface of the cutter to engage the side of the borehole for holding gage. The gage insert has a substantially flat, polygonal face defining at least a pair of sharp cutting edges and at least a pair of cutting surfaces that define a negative rake angle with respect to the sidewall of the borehole that is being sheared by the gage insert. The face, cutting edge, and cutting surface of the gage insert are formed of a super-hard and abrasion-resistant material such as polycrystalline diamond or cubic boron nitride. The body of the insert is formed of a hard, fracture-tough material such as cemented tungsten carbide. The improved gage inserts provide an actively cutting gage surface that engages the sidewall of the borehole to promote shearing removal of the sidewall material. Such an improved gage insert provides an earth-boring bit with improved gage-holding ability, and improved steerability in directional drilling operations.

Title
Fixed cutter bit with shear cutting gage
Application Number
830130
Publication Number
5467836
Application Date
September 2, 1994
Publication Date
November 21, 1995
Inventor
Rudolf C O Pessier
Houston
TX, US
Danny E Scott
The Woodlands
TX, US
Robert E Grimes
Cypress
TX, US
Agent
Mark D Perdue
Robert A Felsman
Assignee
Baker Hughes Incorporated
TX, US
IPC
E21B 12/04
E21B 10/46
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