Identification of Vertical Upward Oil-Gas-Water Three-Phase Flow Pattern Based on Nonlinear Analysis Method |
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| Zhen-ya Wang, Ning-de Jin, Zhong-ke Gao, Rong-hua Xie, Xing-bin Liu |
- Abstract:
- In order to study oil-gas-water three-phase flow characteristics in oil well, the vertical upward three-phase flow experiment at low velocity was carried out in a large diameter (125 mm ID) flow loop using the combination instrument of vertical multi-electrode array (VMEA) conducatance sensor and mini-conductance probe array, and the conductance fluctuating signals of five three-phase flow patterns with water as the continuous liquid were acquired. The nonlinear dynamical characteristics of the five flow patterns were represented by nonlinear analysis method, which are chaotic attractor morphological description and complexity measures including Lempel-Ziv complexity and approximate entropy. The study results indicate that chaotic attractor morphological characteristics could identify three-phase flow pattern; the combination of Lempel-Ziv complexity and approximate entropy could serve as the classification criterion of the flow patterns mentioned above. The nonlinear information processing and analysis of time series provides a new approach to studying the dynamical evolution mechanism of the complex multiphase flow.
- Keywords:
- Oil-gas-water three-phase flow, Flow pattern, Nonllinear dynamical characteristics, Complexity measure
- Download:
- IMEKO-TC9-2010-061.pdf
- DOI:
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