Abstract
The drilling process is considered one of the most expensive and complex in the oil and gas industry. This paper is focused on the dynamics of a drill-string in which stick–slip oscillations can happen, reducing operational performance and increasing the costs. The main concern of this work is to analyze the consequences of a passage from a soft to a harder rock layer in the system response and how uncertainties influence this response. A one degree-of-freedom model is proposed where the top speed is prescribed, the drilling mud is represented by a viscous friction and the bit–rock interaction is represented by a non-linear model. First, the response of the system is analyzed when there is no rock transition, i.e., a single rock layer is considered. The transition from a soft to a harder rock layer is then included and the deterministic and stochastic responses of the system are assessed. The results show that different scenarios can significantly change system response.
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Acknowledgements
The authors would like to express their gratitude to the National Council for Scientific and Technological Development (CNPq) for its financial support under grant number 483391/2013, to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for its financial support under grant number AUXPE n.1197/2014 and to Carlos Chagas Filho Foundation for the Support of the Research in the State of Rio de Janeiro (FAPERJ) for its financial support under grant number E-26/201.572/2014.
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Lobo, D.M., Ritto, T.G. & Castello, D.A. Stochastic analysis of torsional drill-string vibrations considering the passage from a soft to a harder rock layer. J Braz. Soc. Mech. Sci. Eng. 39, 2341–2349 (2017). https://doi.org/10.1007/s40430-017-0800-2
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DOI: https://doi.org/10.1007/s40430-017-0800-2