Abstract
In this paper, we develop a predictive model for the multi-phase wellbore flows based on ensembles of decision trees like Random Forest or XGBoost. The tree-based ensembles are trained on the time series of different physical parameters generated using the numerical simulator of the full-scale transient wellbore flows. Once the training is completed, the ensemble is used to predict one of the key parameters of the wellbore flow, namely, the bottomhole pressure. According to our recent experiments with complex wellbore configurations and flows, the normalized root mean squared error (NRMSE) of prediction below 5% can be achieved and beaten by ensembles of decision trees in comparison to artificial neural networks. Moreover, the obtained solution is more scalable and demonstrate good noise-tolerance properties. The error analysis shows that the prediction becomes particularly challenging in the case of highly transient slug flows. Some hints for overcoming these challenges and research prospects are provided.
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Acknowledgments
The paper was partially prepared within the framework of the Basic Research Program at the National Research University Higher School of Economics (HSE) and supported within the framework of a subsidy by the Russian Academic Excellence Project ‘5-100’. The authors are grateful to Schlumberger and to Marina Bulova, Dean Willberg, Bertrand Theuveny in particular for supporting this work. Dmitry Ignatov was supported by the Russian Foundation for Basic Research, grants no. 16-01-00583 and 16-29-12982.
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Ignatov, D.I., Sinkov, K., Spesivtsev, P., Vrabie, I., Zyuzin, V. (2018). Tree-Based Ensembles for Predicting the Bottomhole Pressure of Oil and Gas Well Flows. In: van der Aalst, W., et al. Analysis of Images, Social Networks and Texts. AIST 2018. Lecture Notes in Computer Science(), vol 11179. Springer, Cham. https://doi.org/10.1007/978-3-030-11027-7_22
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DOI: https://doi.org/10.1007/978-3-030-11027-7_22
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