Gas expansion-induced acceleration effect in high-pressure gas flows near a wellbore

Y. Jin, Kangping Chen, M. Chen, N. Grapsas

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


In a high-pressure gas well, gas acceleration increases continuously as the gas moves and expands toward the wellbore. This expansion-induced acceleration effect in the linear flow of a high-pressure gas near a wellbore is studied. It is shown that for a given bottomhole flowing pressure, gas acceleration reduces mass flow rate, and for a given mass flow rate, gas acceleration decreases bottomhole flowing pressure. Acceleration steepens the pressure profile near the wellbore. When the bottomhole flowing pressure is decreased to a critical value, the gas mass flow rate reaches a maximum and the flow becomes choked. At choking condition, the gas pressure curve forms a vertical tangent at the wellbore wall and creates an unbounded pressure gradient. A further decrease in the bottomhole flowing pressure induces expansion shocks at the wellbore wall.

Original languageEnglish (US)
Pages (from-to)317-328
Number of pages12
JournalJournal of Porous Media
Issue number4
StatePublished - 2012


  • Compressible flow
  • Large pressure gradient
  • Near-wellbore flow
  • Porous media

ASJC Scopus subject areas

  • Modeling and Simulation
  • Biomedical Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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