Online published: 2013-11-26
The current two-phase flow models developed for gas wells cannot be used to correctly predict the pressure losses and micro-flow-parameters for non-annular flow in gas wells. This paper established a two-phase flow model for non-annular flow in gas wells. Firstly, a non-annular flow-pattern prediction model was proposed based on the force balance of liquid droplet and the blockage of liquid film. Then a unit-cell model for pressure drop was developed according to the intermittent flow characteristics of non-annular flow. The bubble rise velocity was obtained based on drift-flux model, and the void fraction in liquid slug was obtained from the Schmidt experimental data. The evaluation data from 38 non-annular-flow gas wells show that the relative error of this model is only -1.464%. Application examples
show that the model can calculate the detailed flow parameters.
SHI Jiannan , TANG Guolong , WU Jing , PU Yuhao , LIU Jiang , NIU Xiaobing . Two-phase flow model for non-annular flow in gas wells[J]. Lithologic Reservoirs, 2013 , 25(6) : 103 -106 . DOI: 10.3969/j.issn.1673-8926.2013.06.019
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