Special Oil & Gas Reservoirs >

2024 , Vol. 31 >Issue 3: 98 - 105

DOI: https://doi.org/10.3969/j.issn.1006-6535.2024.03.013

Reservoir Engineering

Experimental Study on Flow Pattern of Two-phase Slug (Gas and Liquid) in Fractures

  • Ni Xiaoming ,
  • Zhao Yanwei ,
  • Guo Shengqiang ,
  • He Qinghong ,
  • Yan Jin ,
  • Song Jinxing
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  • 1. Henan Polytechnic University, Jiaozuo, Henan 454000, China;
    2. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, Henan 454000, China;
    3. Shanxi Blue Flame Coalbed Methane Group Co., Ltd., Jincheng, Shanxi 048200, China

Received date: 2023-05-12

  Revised date: 2024-03-30

  Online published: 2024-07-26

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Abstract

To address the lack of consensus on the slug flow pattern and control factors in the middle section of reservoir fractures, the flow pattern of slug in fracture is studied, the influence and fluctuation characteristics of key parameters of slug flow are analyzed, such as fracture diameter and gas-liquid phase flow rate. The results indicate that the two-phase slug flow presents periodic characteristics in the fracture by using micro-scale flow simulation experimental device of two phase (gas and liquid) migration and production,. From formation to disappearance, the gas slug can be divided into three stages: formation, expansion and dominance. The fracture diameter is linearly negatively correlated with the slug frequency and linearly positively correlated with the fluctuation range of gas and liquid phase flow. As the liquid flow rate was set at 15.00, 20.00, 25.00 and 30.00 cm3/min, the variance ratio of slug frequency decreased with increasing gas flow rate, being 0.130,0.012,0.009 and 0.007, respectively.Similarly, the variance ratio of liquid holdup decreased with increasing gas flow rate, being 1.503,1.175,0.918 and 0.820, respectively. The findings have guiding significance for the study of slug flow mechanism in the process of coalbed methane development.

Key words： gas-liquid phase flow; periodicity; slug flow; liquid holdup; fracture diameter

Cite this article

Ni Xiaoming , Zhao Yanwei , Guo Shengqiang , He Qinghong , Yan Jin , Song Jinxing . Experimental Study on Flow Pattern of Two-phase Slug (Gas and Liquid) in Fractures[J]. Special Oil & Gas Reservoirs, 2024 , 31(3) : 98 -105 . DOI: 10.3969/j.issn.1006-6535.2024.03.013

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