%0 Journal Article %A Jin, Y. %A Chen, K. P. %A Chen, M. %A Grapsas, N. %D 2012 %I Begell House %K porous media, compressible flow, near-wellbore flow, large pressure gradient %N 4 %P 317-328 %R 10.1615/JPorMedia.v15.i4.20 %T GAS EXPANSION-INDUCED ACCELERATION EFFECT IN HIGH-PRESSURE GAS FLOWS NEAR A WELLBORE %U https://www.dl.begellhouse.com/journals/49dcde6d4c0809db,3083834126e17635,6bcb83b973912664.html %V 15 %X 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.. %8 2012-03-30