### Abstract

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 language | English (US) |
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Pages (from-to) | 317-328 |

Number of pages | 12 |

Journal | Journal of Porous Media |

Volume | 15 |

Issue number | 4 |

DOIs | |

State | Published - May 7 2012 |

### Keywords

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

### ASJC Scopus subject areas

- Modeling and Simulation
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering

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## Cite this

*Journal of Porous Media*,

*15*(4), 317-328. https://doi.org/10.1615/JPorMedia.v15.i4.20