The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 2021
Filed:
Mar. 19, 2014
Schlumberger Technology Corporation, Sugar Land, TX (US);
Benjamin Peter Jeffryes, Cambridge, GB;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
An apparatus and method for controlling a drilling system in a manner that reduces stick-slip by receiving a desired rotation speed vof the drive system to rotate the drillstring, receiving property measurements of the drilling system, and deriving therefrom a rotation speed vof 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 downgoing energy in the drillstring as a mathematical expression containing a sum of downgoing 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.