Estimation of Pressure Drop, Liquid Holdup and Flow Pattern in a Two Phase Vertical Flow

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Author(s) Omon Ehizoyanyan | Dulu Appah | Okotie Sylvester
Pages 241-253
Volume 5
Issue 4
Date April, 2015
Keywords Liquid Holdup, Pressure Drop Gradient, MULTIFLOW Software, Flow Pattern, Production Facilities, Multiphase Flow, Immiscible Liquids and Mathematical Model.

Abstract

In the industries today, diverse range of equipment and processes encounter two immiscible liquids flow. Particularly in the petroleum industry, where mixtures of oil and water are transported in pipes over long distances, and to accurately design and operate oil production facilities in an optimized means, it is necessary to accurately predict the behavior of two-phase flow of hydrocarbon in pipes with different angles. It would be desired to apply a more unified model to every conceivable condition such as inclination angles, pipe diameters, flow rates and pressures practically. Most engineering applications make use of flow pattern, liquid holdup and pressure gradient in the design and processes of surface facilities; which implies that accurate prediction of oil-water flow characteristics is very important. However, despite this importance, liquid-liquid flows have not been explored to the same extent as gas-liquid flows. This study is aimed at developing a model for liquid holdup, pressure drop gradient with DataFit and estimating the bottom hole flowing pressure for single and multiphase system, the liquid holdup and the flow pattern of a vertical well from existing correlations incorporated into MULTIFLOW software developed in this study. Holdup data were obtained for liquid flow rates between 610.68 lb/sec and 6349.31 lb/sec and gas flow rates in the range from 17041.73 lb/sec and 32848.88 lb/sec. The wavy-stratified flow pattern was observed for the liquid rates of 610.68 lb/sec and 17041.73 lb/sec and for all gas flows. For higher liquid rates, the flow pattern was always pseudo-slug flow. A decrease, not far from linear, in the liquid holdup was observed as the gas flow increases.

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