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Intermittent slug flow identification and characterization from pressure signature

机译：压力签名的间歇式SLUIN流程识别和表征

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摘要

Despite of its occurrence in several industrial applications, it remains an open issue to accurately predict the behavior of multiphase flow. More specifically, when direct observation of the flow is not possible, which typically occurs in the petroleum industry, indirect methods of identifying main features of the flow are necessary. In this paper, we propose a method for the determination of some important parameters in two-phase gas-liquid flow, the velocity in situ of the Taylor Bubble, using differential pressure measurements. This is done through the analysis of the time and frequency signature of a normalized signal and its coupling with void fraction waves. A phase difference estimator based on the cross-spectra between differential pressure signals is proposed. It is experimentally shown that there is a region of the spectrum where the differential pressure signals and the void fraction kinematic waves are coupled. Besides, a relation between the differential pressure signals and the void fraction wave is established, allowing to discuss the underlying physics of the two-phase flow and then determining the Taylor bubble velocity. In this paper, results are shown for intermittent slug flow only, but the proposed approach can potentially be extended to different flow patterns. The presented results show that the use of differential pressure measurements related to void fraction waves have the potential of becoming a methodology applicable by the industry as a tool to identify and characterize flow patterns.
机译：尽管发生了若干工业应用，但它仍然是准确预测多相流动的行为的开放问题。更具体地，当不可能直接观察流动时，这通常发生在石油工业中，必要地识别流动的主要特征的间接方法。在本文中，我们提出了一种方法，用于测定两相气体流动中的一些重要参数，泰勒气泡的速度使用差压测量。这是通过分析归一化信号的时间和频率特征及其与空隙率波的耦合来完成的。提出了一种基于差压信号之间的交叉光谱的相位差估计。实验示出了存在差分压力信号和空隙率运动波耦合的光谱的区域。此外，建立差压信号与空隙分数波之间的关系，从而允许讨论两相流的底层物理，然后确定泰勒气泡速度。在本文中，仅针对间歇式块流示出了结果，但是所提出的方法可能延伸到不同的流动模式。所提出的结果表明，使用与空隙率波浪相关的差压测量有可能成为行业适用的方法作为识别和表征流动模式的工具。

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