Upward Vertical Two-Phase Flow Through an Annulus—Part II: Modeling Bubble, Slug, and Annular Flow

[+] Author and Article Information
E. F. Caetano, O. Shoham, J. P. Brill

The University of Tulsa, Tulsa, OK 74104

J. Energy Resour. Technol 114(1), 14-30 (Mar 01, 1992) (17 pages) doi:10.1115/1.2905916 History: Received September 15, 1990; Revised June 23, 1991; Online April 16, 2008


Mechanistic models have been developed for each of the existing two-phase flow patterns in an annulus, namely bubble flow, dispersed bubble flow, slug flow, and annular flow. These models are based on two-phase flow physical phenomena and incorporate annulus characteristics such as casing and tubing diameters and degree of eccentricity. The models also apply the new predictive means for friction factor and Taylor bubble rise velocity presented in Part I. Given a set of flow conditions, the existing flow pattern in the system can be predicted. The developed models are applied next for predicting the flow behavior, including the average volumetric liquid holdup and the average total pressure gradient for the existing flow pattern. In general, good agreement was observed between the experimental data and model predictions.

Copyright © 1992 by The American Society of Mechanical Engineers
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