Choked Gas Flow at Pore-Scale and Its Implications to Production From High-Pressure Gas Wells

Author:

Yuan Jing1,Ping Chen Kang2

Affiliation:

1. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287-6106

2. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287-6106 e-mail:

Abstract

Production from a high-pressure gas well at a high production rate encounters the risk of wellbore tensile failure when the pressure gradient of the averaged gas flow becomes large. At the pore-scale, however, when flow in just one pore is choked, gas pressure gradient at the point of choking becomes singular, leading to an unbounded average of the pressure gradient. This study investigates the choking condition for compressible gas flow in a single pore. It is found that wellbore tensile failure can occur at a much lower inlet-to-outlet pressure ratio than predicted from the macroscopic theory of porous medium flow.

Publisher

ASME International

Subject

Mechanical Engineering

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