04932484 is referenced by 107 patents and cites 10 patents.

A whirl resistant drill bit is disclosed for use in rotary drilling. The drill bit includes a generally cylindrical bit body with a plurality of cutting elements extending out from a lower end surface. The cutter elements are grouped in sets such that a first set of cutters are disposed at substantially an equal radius from a center of the bit body to create a groove in the material being drilled. A second set of cutters is connected to the lower end surface with each cutter therein in overlapping radial relationship with each other and extending a maximum distance from the lower end surface less than that of the first set of cutters. At least one cutter of the second set is in overlapping radial relationship with at least one of the cutters within the first set of cutters. This cutter arrangement causes the drill bit to cut grooves within the formation material that tends to prevent destructive bit whirl. Further, adjustments can be made to vary the back rake angle and side rake angle to prevent bit whirl.

Title
Whirl resistant bit
Application Number
7/335398
Publication Number
4932484
Application Date
April 10, 1989
Publication Date
June 12, 1990
Inventor
J Ford Brett
Tulsa
OK, US
Tommy M Warren
Coweta
OK, US
Agent
Fred E Hook
Scott H Brown
Assignee
Amoco Corporation
IL, US
IPC
E21B 10/46
E21B 10/26
View Original Source