Experimental and Numerical Studies on the Drift Velocity of Two-Phase Gas and High-Viscosity-Liquid Slug Flow in Pipelines

Raymond A. Eghorieta, Victor Pugliese, Ekarit Panacharoensawad
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引用次数: 2

Abstract

Drift velocity for two-phase air and high viscosity oil has been studies in depth, in this research. The drift velocity is one of the key parameters used in the prediction of gas-liquid two-phase flow hydrodynamic behavior. Improvement on the drift velocity closure relationship allows a better design for pipelines and wellbores system that experience two-phase flow phenomena. Researchers have relied on empirical correlations as a means to predict the drift velocity. These empirical correlations have been limited to the flow of gas and low viscosity (20 cp and lower) liquid. In this study, the effect of drift velocity on gas and high viscosity two-phase flow in pipelines have been investigated. Drift velocity experiments and numerical calculation were carefully performed. A well-designed 1.5-in internal diameter flow loop facility with the capability of pressure drop and liquid holdup measurement was used for this drift flux velocity measurement. Various computational intensive simulations for drift velocities have been performed. A new empirical correlation was developed for the prediction of the drift velocity in horizontal and near horizontal pipelines. The effects of inclination and pipe diameters have been accounted for in the new correlation which increase its range of applicability. The correlation was validated and compared with other existing drift velocity correlations and experimental data. The new closure relationship allows a significant improvement on the pressure drop prediction for the cases of two-phase gas and high-viscosity-liquid flow in pipe. This enable the transient calculation for subsea pipeline transporting gas and high-viscosity oil by using a drift flux model.
管道中两相气液段塞流漂移速度的实验与数值研究
本文对两相空气和高粘度油的漂移速度进行了深入的研究。漂移速度是预测气液两相流流体动力特性的关键参数之一。通过对漂移速度闭合关系的改进,可以更好地设计经历两相流现象的管道和井筒系统。研究人员依靠经验相关性作为预测漂移速度的手段。这些经验相关性仅限于气体和低粘度(20cp及以下)液体的流动。本文研究了漂移速度对管道内气体和高粘度两相流的影响。进行了漂移速度实验和数值计算。采用精心设计的1.5 in内径流环装置,具有压降和含液率测量功能,用于漂移通量速度测量。对漂移速度进行了各种计算密集的模拟。建立了一种新的经验相关性,用于预测水平和近水平管道的漂移速度。在新的关联中考虑了倾角和管径的影响,增加了关联的适用范围。验证了该相关性,并与其他已有漂移速度相关性和实验数据进行了比较。新的封闭关系对两相气和高粘液在管内流动的压降预测有显著的改善。这使得利用漂移通量模型对海底输气和高粘度石油管道进行瞬态计算成为可能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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