A Comprehensive Mechanistic Model for Two-Phase Flow in Pipelines

Abstract

SPE Members Abstract A comprehensive mechanistic model has been developed for gas-liquid two-phase flow in horizontal and near horizontal pipelines. The model is able first to detect the existing flow pattern, and then to predict the flow characteristics, primarily liquid holdup and pressure drop, for the stratified, intermittent. annular, pressure drop, for the stratified, intermittent. annular, or dispersed bubble flow patterns. A pipeline data bank has been established. The data bank includes large diameter field data culled from the A. G. A. database, and laboratory data published in the literature. Data include both black oil and compositional fluid systems. The comprehensive mechanistic model has been evaluated against the data bank and also compared with the performance of some of the most commonly used correlations for two-phase flow in pipelines. The evaluation, based on the comparison between the predicted and the measured pressure drops. predicted and the measured pressure drops. demonstrated that the overall performance of the proposed model is better than that of any of the proposed model is better than that of any of the correlations, with the least absolute average percent error and the least standard deviation. Introduction Prediction of flow patterns, liquid holdup and pressure loss for two-phase flow in pipelines is pressure loss for two-phase flow in pipelines is important for designing gas-liquid transportation systems. The traditional approach to solve the problem has been to conduct experiments and develop empirical correlations. Although these correlations have contributed significantly to the design of two-phase flow systems, they did not take into consideration the physical phenomena. physical phenomena. Since the mid 1970's. significant progress has been made in this area. Models have been developed to predict flow patterns. Separate Models have also been predict flow patterns. Separate Models have also been proposed for the prediction of the flow characteristics proposed for the prediction of the flow characteristics for each flow pattern, namely stratified flow, intermittent flow, annular flow and dispersed bubble flow. However, up to date, no study has been carried out to verify the consistency and the applicability of these models. The purpose of this study is to develop a comprehensive mechanistic model for two-phase flow in pipelines by combining the most recent developments in pipelines by combining the most recent developments in this area. The model is then evaluated against a field and laboratory measurement data bank, and compared with several commonly used empirical correlations. FLOW PATTERN PREDICTION MODEL When gas and liquid flow simultaneously in a pipe, the two phases can distribute themselves in a pipe, the two phases can distribute themselves in a variety of flow configurations or flow patterns, depending on operational parameters. geometrical variables as well as physical properties of the two phases. phases. P. 167

Low liquid loading gas/liquid pipe flow

“…Xiao (Xiao, 1990) evaluated published correlations and concluded that the Andritsos and Hanratty (Andritsos and Hanratty, 1987) correlation of interfacial friction factor is suitable for small diameter pipes (d 0.127 m). It was developed for stratified flow assuming a flat interface,…”

Estimating Flow Patterns and Frictional Pressure Losses of Two-Phase Fluids in Horizontal Wellbores Using Artificial Neural Networks

“…Then, governing flow equations were proposed for a given flow pattern. Good examples of the major mechanistic models that describe flow mechanisms based on flow patterns are found in Taitel and Dukler (1976), Xiao et al (1990), and Petalas and Aziz (2000). For the case of flow of two-phase fluids flowing through annular geometries, few studies have been conducted.…”

Estudio Experimental de Patrones de Flujo Bifásico Aire-Agua en Tuberías Horizontales y Ligeramente Inclinadas

“…En esta sección se evalúa la precisión de los modelos mecanicistas de Taitel y Dukler (1976), TDMM; Barnea (1987), BMM; Xiao et al (1990), XMM, y Ouyang y Aziz (2002), OAMM y de los modelos de correlación de Mandhane et al (1974), MMC, y Mukherjee y Brill (1985), MBMC, en la determinación de los patrones de flujo. El modelo de Mandhane et al (1974), es aplicable únicamente para flujo horizontal.…”

“…Los modelos de Taitel y Dukler (1976), Mukherjee y Brill (1985) y Xiao et al (1990), identificaron todos los puntos de flujo tapón, es decir, presentaron un porcentaje de acierto de 100%. Para flujo anular, la mejor precisión la obtiene el modelo de Taitel y Dukler (1976), con un porcentaje de acierto de 89.0%.…”