Active control of stick-slip torsional vibrations in drill-strings
Active control of stick-slip torsional vibrations in drill-strings
This paper presents active vibration control to reduce the stick-slip oscillations in drill-strings. A simplified two degrees-of-freedom drill-string torsional model is considered. The nonlinear interaction between the rock and the bit is included in the model, where its parameters are fitted with field data from a 5 km drill-string system. Different proportional-derivative (PD)-control strategies are employed and compared, including the one that takes into account the weight-on-bit (axial force) and the bit speed. Optimization problems are proposed to obtain the values of the gain coefficients, and a torsional stability map is constructed for different weight-on-bit values and top-drive speeds. It is noted that the information of the dynamics at the bottom increases the performance of the PD-controller significantly in terms of the torsional vibration suppression, for the system analyzed.
Ritto, Thiago
504de863-308a-4944-81d8-c35a0b74b760
Ghandchi Tehrani, Maryam
c2251e5b-a029-46e2-b585-422120a7bc44
Ritto, Thiago
504de863-308a-4944-81d8-c35a0b74b760
Ghandchi Tehrani, Maryam
c2251e5b-a029-46e2-b585-422120a7bc44
Ritto, Thiago and Ghandchi Tehrani, Maryam
(2018)
Active control of stick-slip torsional vibrations in drill-strings.
Journal of Vibration and Control.
Abstract
This paper presents active vibration control to reduce the stick-slip oscillations in drill-strings. A simplified two degrees-of-freedom drill-string torsional model is considered. The nonlinear interaction between the rock and the bit is included in the model, where its parameters are fitted with field data from a 5 km drill-string system. Different proportional-derivative (PD)-control strategies are employed and compared, including the one that takes into account the weight-on-bit (axial force) and the bit speed. Optimization problems are proposed to obtain the values of the gain coefficients, and a torsional stability map is constructed for different weight-on-bit values and top-drive speeds. It is noted that the information of the dynamics at the bottom increases the performance of the PD-controller significantly in terms of the torsional vibration suppression, for the system analyzed.
Text
JVC-MaryamRitto-2017g
- Accepted Manuscript
More information
Accepted/In Press date: 9 April 2018
e-pub ahead of print date: 10 May 2018
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Local EPrints ID: 421479
URI: http://eprints.soton.ac.uk/id/eprint/421479
ISSN: 1077-5463
PURE UUID: 65ded22e-0911-428d-bc25-5144faf85ebf
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Date deposited: 13 Jun 2018 16:30
Last modified: 15 Mar 2024 20:10
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Author:
Thiago Ritto
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