Imbalance compensated drill bit

Details Imbalance compensated drill bit Imbalance compensated drill bit

1990-07-12

1991-08-27

Dang, Hoang C.

Boring or penetrating the earth

Processes

175329, 175399, 175408, E21B 710, E21B 1000, E21B 1046

Patent

active

050425960

ABSTRACT:
An imbalance compensated drill bit is disclosed that takes advantage of undesired and destructive imbalance forces to prevent bit whirl. Methods of designing and making such imbalance compensated drill bits are disclosed whereby a drill bit body has at least one cutting zone with a plurality of cutting elements extending therefrom 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 borehole wall, and the bearing zone slips along the wall, thereby preventing the center of rotation to shift and create the destructive whirling motion.

REFERENCES:
patent: 1463566 (1923-07-01), Akins
patent: 3163243 (1964-12-01), Cleary
patent: 3629558 (1971-12-01), Coggin
patent: 3751177 (1973-08-01), Faber
patent: 3851719 (1974-12-01), Thompson et al.
patent: 3966349 (1976-06-01), Osman et al.
patent: 4545441 (1985-10-01), Williamson
patent: 4549614 (1985-10-01), Kaalstad et al.
patent: 4641718 (1987-02-01), Bengtsson
patent: 4753305 (1988-06-01), Fisher
patent: 4790397 (1988-12-01), Kaalstad et al.
Brett et al., "Bit Whirl: A New Theory of PDC Bit Failure", SPE 19571, Oct. 1989.
Osman et al., "On the Development of Multi-Edge Cutting Tools for BTA Deep-Hole Machining"; Journal of Engineering for Industry, May 1976, pp. 474-480.

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