Sliding-mode control of a multi-DOF oilwell drillstring with stick-slip oscillations

A dynamical sliding-mode control is used to avoid different bit sticking problems present in a conventional vertical oilwell drillstring. The control goal of driving the rotary velocities of drillstring components to a constant positive value is achieved by means of this control. A discontinuous lum...

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Bibliographic Details
Published in2007 American Control Conference pp. 3837 - 3842
Main Authors Navarro-Lopez, E.M., Cortes, D.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2007
Subjects
Cities and towns
Control systems
discontinuous systems
dry friction
Friction
Industrial control
Motion control
nonlinear control
Nonlinear control systems
Nonlinear dynamical systems
oilwell drillstrings
Sliding mode control
Sliding motions
Torque
Velocity control
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ISBN9781424409884
1424409888
ISSN0743-1619
DOI10.1109/ACC.2007.4282198

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Summary:A dynamical sliding-mode control is used to avoid different bit sticking problems present in a conventional vertical oilwell drillstring. The control goal of driving the rotary velocities of drillstring components to a constant positive value is achieved by means of this control. A discontinuous lumped- parameter torsional model of four degrees of freedom is considered. This model allows to describe drill pipes and drill collars behavior. The closed-loop system has two discontinuity surfaces. One of them gives rise to self-excited bit stick-slip oscillations and bit sticking phenomena. The other surface is introduced to accomplish the control goal despite variations in the weight on the bit (key to the dynamics) and other system parameters.
ISBN:9781424409884
1424409888
ISSN:0743-1619
DOI:10.1109/ACC.2007.4282198