期刊
JOURNAL OF VIBRATION AND CONTROL
卷 25, 期 1, 页码 194-202出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1077546318774240
关键词
Drill-string torsional dynamics; nonlinear dynamics; stability map; active control; stick-slip oscillations
资金
- FAPERJ [E-26/201.572/2014]
- CNPQ [400933/2016-0]
- EPSRC [EP/K005456/1] Funding Source: UKRI
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.
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