Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1989-04-10
1990-06-12
Kisliuk, Bruce M.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175385, 175398, 175408, 175410, E21B 1026, E21B 1046
Patent
active
049324845
ABSTRACT:
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.
REFERENCES:
patent: 1897588 (1933-02-01), Reed
patent: 2244537 (1941-06-01), Kammerer
patent: 4186628 (1980-02-01), Bonnice
patent: 4440247 (1984-04-01), Sartor
patent: 4471845 (1984-09-01), Jurgens
patent: 4545441 (1985-10-01), Williamson
patent: 4593777 (1986-06-01), Barr
patent: 4660659 (1987-04-01), Short, Jr. et al.
patent: 4673044 (1987-06-01), Bigelow et al.
Hough, "The Effect of Back Rake Angle on the Performance of Small-Diameter PCD Bits: ANOVA Tests", JERT, Dec. 1986, vol. 108/305.
Brett J. Ford
Warren Tommy M.
Amoco Corporation
Brown Scott H.
Hook Fred E.
Kisliuk Bruce M.
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