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Journal of Porous Media
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ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v15.i4.20
pages 317-328

GAS EXPANSION-INDUCED ACCELERATION EFFECT IN HIGH-PRESSURE GAS FLOWS NEAR A WELLBORE

Y. Jin
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102200, China
K. P. Chen
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102200, China ; School for Engineering of Matter, Transport & Energy, Arizona State University, Tempe, Arizona 85287-6106, USA
M. Chen
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102200, China
N. Grapsas
School for Engineering of Matter, Transport & Energy, Arizona State University, Tempe, Arizona 85287-6106, USA

ABSTRAKT

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..


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