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<p>The study presents thermodynamic calculations of the properties of Achimov formation gas and its behavior during throttling (isenthalpic flow) in the near-wellbore zone (NWZ) for cases involving both mobile and immobile hydrocarbon condensate. The discussion covers non-isothermal effects over a wide range of reservoir pressures from 15 to 60 MPa and high-pressure drops across the reservoir. For an analytical description of gas flow in the NWZ, a nontraditional approach utilizing the calculation of two isenthalpic indices is employed. To process the results of the well’s gas-dynamic studies, a complex index is proposed that simultaneously accounts for non-isothermal flow and the gas’s high density (strong non-ideality). An assessment of the role of non-isothermal effects during short-term gas-dynamic studies of wells is also discussed.</p>

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Thermodynamic Properties and Non-Isothermal Gas Flow in the Bottom-Hole Zone of a Production Well in the Achimov Horizon

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • D. V. Sergeeva,
  • V. A. Istomin,
  • D. O. Davydov,
  • P. M. Zobov

摘要

The study presents thermodynamic calculations of the properties of Achimov formation gas and its behavior during throttling (isenthalpic flow) in the near-wellbore zone (NWZ) for cases involving both mobile and immobile hydrocarbon condensate. The discussion covers non-isothermal effects over a wide range of reservoir pressures from 15 to 60 MPa and high-pressure drops across the reservoir. For an analytical description of gas flow in the NWZ, a nontraditional approach utilizing the calculation of two isenthalpic indices is employed. To process the results of the well’s gas-dynamic studies, a complex index is proposed that simultaneously accounts for non-isothermal flow and the gas’s high density (strong non-ideality). An assessment of the role of non-isothermal effects during short-term gas-dynamic studies of wells is also discussed.