Stick-Slip Reduction Using Combined Torsional and Axial Control
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United States of America Patent
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Dec 28, 2017
app pub date -
Jun 28, 2016
filing date -
Jun 28, 2016
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Abstract
The aspects described herein assist in mitigating vibrations arising from torsional energy accumulating on a drill string in a wellbore during drilling operations. A first sensor obtains torque measurement data at or near the top drive of the drilling rig. A second sensor may obtain weight on bit information. The controller receives the measured data, combines it with a first gain to obtain a first output value and a second gain to obtain a second output value. The first output value is provided to the top drive to adjust a speed of operation of the top drive, and the second output value is provided to the axial drive providing motion along a vertical axis of the drilling rig to adjust a speed of the vertical motion. In combination, the adjustments to the top drive and axial drive movements mitigate stick-slip in an automated manner more effectively than either individually.
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