Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (6): 103-106.doi: 10.3969/j.issn.1673-8926.2013.06.019

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Two-phase flow model for non-annular flow in gas wells

LIU Tong1， REN Guirong1，ZHAO Ronghuai2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China； 2. Department of Technology Development， PetroChina Tarim Oilfield Company， Korla 841000， China
  • Online:2013-11-26 Published:2013-11-26

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Abstract:

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.

Key words:  accumulation conditions, main controlling factors, difference, Yanchang Formation, Ordos Basin

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