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. 26, 2019
Filed:
Nov. 21, 2017
Applicant:
Nabors Drilling Technologies Usa, Inc., Houston, TX (US);
Inventors:
Mahmoud Hadi, Richmond, TX (US);
Brian Ellis, Spring, TX (US);
Assignee:
NABORS DRILLING TECHNOLOGIES USA, INC., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 44/00 (2006.01); E21B 41/00 (2006.01); G05B 19/416 (2006.01); E21B 47/06 (2012.01);
U.S. Cl.
CPC ...
E21B 44/00 (2013.01); E21B 41/0092 (2013.01); G05B 19/416 (2013.01); E21B 47/06 (2013.01); G05B 2219/39456 (2013.01);
Abstract
Systems and methods for reducing or eliminating whirl are described. The system includes a controller and a drive system. The controller is configured to collect downhole information, determine a natural frequency of a drill string in the lateral motion, determine correlative relationships, model a forward whirl region, generate a control algorithm, determine a top drive supervisory setpoint, and provide operational control signals. The drive system is configured to receive the one or more operational control signals and limit the top drive RPM.