Imbalance compensated drill bit

Details Imbalance compensated drill bit Imbalance compensated drill bit

E - Fixed Constructions

21

B

76/21, 255/68

E21B 7/10 (2006.01) B21K 5/02 (2006.01) B23Q 11/00 (2006.01) E21B 10/42 (2006.01) E21B 10/46 (2006.01) G01B 5/008 (2006.01)

Patent

CA 1333282

An imbalance compensated drill bit is disclosed that takes advantage of undesired and destructive imbal- ance forces to prevent bit whirl. Methods of designing and making such imbalance compensated drill bits are dis- closed whereby a drill bit body has at least one cutting zone with a plurality of cutting elements extending there- from and at least one bearing zone. The bearing zone has a relatively smooth surface and is located at a position where the net imbalance force (from the cutting elements) is directed towards. When the drill bit is rotated, the imbalance force presses the bearing zone against the bore- hole wall, and the bearing zone slips along the wall, thereby preventing the center of rotation to shift and create the destructive whirling motion.

606272

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