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<p>To deeply analyze the flow field structure of gas–liquid two-phase flow and optimize the design of swirl tools to improve liquid carrying efficiency under complex working conditions, this paper systematically investigates the liquid-carrying characteristics of a novel Venturi vortex tool under different liquid fraction conditions during the horizontal well drainage and gas production processes. Five typical liquid fractions (0.07, 0.1, 0.2, 0.3, and 0.5) are selected to cover low, medium, and high liquid fraction conditions, addressing the gap in existing studies that often overlook the high liquid fraction range. The Reynolds Stress Model (RSM) is adopted for numerical simulation. The findings indicate that liquid fraction significantly affects the tool’s liquid entrainment capacity: at low fractions (0.07, 0.1), gas-phase-dominated flow limits liquid holdup to 0.19–0.26; when the liquid fraction reaches 0.2, the flow field transitions from stratified to slug flow, with turbulent kinetic energy peaking and promoting uniform gas–liquid dispersion, thus enhancing the tool’s liquid entrainment capacity, and increasing liquid holdup to 0.4. Under high liquid fraction conditions (0.3–0.5), the liquid phase maintains a stable slug flow regime, during which the vortex tool exhibits the strongest liquid carrying performance, and increases liquid holdup to 0.5. However, the formed slug flow is susceptible to causing pipeline blockages, equipment malfunctions, and other operational issues. Meanwhile, the flow patterns from the simulation results are correlated with the Mandhane flow pattern map, indicating that the numerical simulation can reflect the changes in the interaction intensity and flow structure of the gas–liquid two phases.</p>

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Analysis of Gas–Liquid Two-Phase Flow Field Characteristics of Swirl Drainage Tool Based on Liquid Fraction Variation

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Ke Zhang,
  • Yan Xu,
  • Haonan Wu,
  • Hongtao Zhang,
  • Jiaxiang Wang,
  • Yuejuan Yan

摘要

To deeply analyze the flow field structure of gas–liquid two-phase flow and optimize the design of swirl tools to improve liquid carrying efficiency under complex working conditions, this paper systematically investigates the liquid-carrying characteristics of a novel Venturi vortex tool under different liquid fraction conditions during the horizontal well drainage and gas production processes. Five typical liquid fractions (0.07, 0.1, 0.2, 0.3, and 0.5) are selected to cover low, medium, and high liquid fraction conditions, addressing the gap in existing studies that often overlook the high liquid fraction range. The Reynolds Stress Model (RSM) is adopted for numerical simulation. The findings indicate that liquid fraction significantly affects the tool’s liquid entrainment capacity: at low fractions (0.07, 0.1), gas-phase-dominated flow limits liquid holdup to 0.19–0.26; when the liquid fraction reaches 0.2, the flow field transitions from stratified to slug flow, with turbulent kinetic energy peaking and promoting uniform gas–liquid dispersion, thus enhancing the tool’s liquid entrainment capacity, and increasing liquid holdup to 0.4. Under high liquid fraction conditions (0.3–0.5), the liquid phase maintains a stable slug flow regime, during which the vortex tool exhibits the strongest liquid carrying performance, and increases liquid holdup to 0.5. However, the formed slug flow is susceptible to causing pipeline blockages, equipment malfunctions, and other operational issues. Meanwhile, the flow patterns from the simulation results are correlated with the Mandhane flow pattern map, indicating that the numerical simulation can reflect the changes in the interaction intensity and flow structure of the gas–liquid two phases.