METHOD AND DEVICE TO REDUCE OSCILLATIONS OF STICKING-SLIPPING IN DRILLING STRING Russian patent published in 2013 - IPC E21B44/00 

Abstract RU 2478781 C2

FIELD: mining.

SUBSTANCE: method contains the following stages: (a) damping of sticking-slipping oscillations using a drilling mechanism above a drilling string, (b) control of drilling mechanism speed of rotation using a PI controller, (c) turning of a PI controller so that the drilling mechanism absorbs a larger part of twisting energy from the drilling string at the frequency of sticking-slipping oscillations or near it.

EFFECT: tuning of proportional-integral or proportional-integral-differential controller for damping of twisting waves energy at sticking-slipping frequency or near it.

21 cl, 8 dwg

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RU 2 478 781 C2

Authors

Kjullingstad Oge

Dates

2013-04-10Published

2008-12-02Filed