Method and system for controlling the rotary speed stability of

Details Method and system for controlling the rotary speed stability of Method and system for controlling the rotary speed stability of

1994-12-07

1996-04-16

Novosad, Stephen J.

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

175 26, 175 40, E21B 4400, E21B 4700

Patent

active

055073530

ABSTRACT:
A method and a system suited for controlling the behavior of a drill bit includes an additional resistant torque added to the torque about the drill bit so that the overall torque about the drill bit is an increasing function of the rotary speed of the bit. The system includes control means suited for creating an additional resistant torque about the bit.

REFERENCES:
patent: 1703234 (1929-02-01), Halliburton
patent: 1786173 (1930-12-01), Scharpenberg
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patent: 3550697 (1970-12-01), Hobhouse
patent: 3593807 (1971-07-01), Klima
patent: 3675727 (1972-07-01), Clark
patent: 4660656 (1987-04-01), Warren et al.
patent: 5226332 (1993-07-01), Wassell
patent: 5277061 (1994-01-01), Draoui
Dufeyte et al., "Detection and Monitoring of the Slip-Stick Motion: Field Experiments," 1991 SPE/IADC Drilling Conference, 11 Mar. 1991, Amsterdam, pp. 429-438.

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