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Purpose <p>To investigate how superficial gas/liquid velocity and oil volume fraction affect the intrinsic vibration frequency for the pipework system that transmits slug flow, a new model has been developed.</p> Methods <p>By incorporating the flow parameters obtained from the slug flow model of high-viscosity oil-gas into the pipeline system vibration model, the governing equations are discretized using the Galerkin method to analyze the natural frequency characteristics of the system.</p> Conclusion <p>The superficial gas velocity of <i>J</i><sub>g</sub> ≤ <i>J</i><sub>cri, g</sub> , the variation of superficial gas velocity is not directly related to its natural frequency, and <i>J</i><sub>g</sub> &gt; <i>J</i><sub>cri, g</sub>, the superficial gas velocity can be transitioned from a secondary influence factor to a primary one. And, in the relatively wide interval of <i>J</i><sub>g</sub>&#xa0;&lt; 2.00m/s, an increase in superficial gas velocity is likely to trigger an increase in natural frequency.</p>

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Natural Frequency Analysis of Pipes Carrying High Viscosity Oil–Gas-Water Slug Flow

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Mei Yang,
  • Pinhao Yao,
  • Liedong Mi

摘要

Purpose

To investigate how superficial gas/liquid velocity and oil volume fraction affect the intrinsic vibration frequency for the pipework system that transmits slug flow, a new model has been developed.

Methods

By incorporating the flow parameters obtained from the slug flow model of high-viscosity oil-gas into the pipeline system vibration model, the governing equations are discretized using the Galerkin method to analyze the natural frequency characteristics of the system.

Conclusion

The superficial gas velocity of Jg ≤ Jcri, g , the variation of superficial gas velocity is not directly related to its natural frequency, and Jg > Jcri, g, the superficial gas velocity can be transitioned from a secondary influence factor to a primary one. And, in the relatively wide interval of Jg < 2.00m/s, an increase in superficial gas velocity is likely to trigger an increase in natural frequency.