Drilling system control for reducing stick-slip by calculating and reducing energy of upgoing rotational waves in a drillstring
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United States of America Patent
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Sep 17, 2024
Grant Date -
Jun 24, 2021
app pub date -
Jan 18, 2021
filing date -
Jan 18, 2021
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Abstract
An apparatus and method for controlling a drilling system in a manner that reduces stick-slip by receiving a desired rotation speed v0 of the drive system to rotate the drillstring, receiving property measurements of the drilling system, and deriving therefrom a rotation speed vup of upgoing rotational waves of the drillstring associated with upgoing rotational energy in the drillstring. An actual rotation speed v of the drive system to rotate the drillstring is determined by representing energy in the drillstring as a mathematical expression containing a sum of rotational energy produced by the drive system and downgoing rotational energy caused by the upgoing rotational waves that are reflected downwardly at an upper end of the drillstring, and then optimizing the mathematical expression, which is then used for controlling the drive system to rotate the drillstring at v.
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