A Productivity Prediction Equation Considering Rock PermeabilityStress-Sensitivity in Low-Permeability Gas Reservoirs
Received date: 2007-10-14
Revised date: 2008-01-06
Online published: 2008-02-10
Pore pressure decreases, effective stress increases, and permeability declines due to matrix and pore compression as gas produces in low-permeability gas reservoirs. This affects the deliverability of low-permeability gas reservoirs. Based on Darcy flow law and the universal cognition that the rock permeability varies with the effective stress exponentially, this paper presents a new equation considering rock permeability stress-sensitivity for estimating the productivity in low-permeability gas reservoirs. A case calculation with this new equation shows that considering permeability stress-sensitivity in the prediction is necessary, especially for the high stress-sensitive low-permeability gas reservoirs,and this will provide necessary reference to determining reasonable producing pressure drop and producing rate.
XU Hong-jun ;FAN Ming-guo ;KANG Zheng ;CHANG Zhi-qiang ;ZHANG Shao-jun . A Productivity Prediction Equation Considering Rock PermeabilityStress-Sensitivity in Low-Permeability Gas Reservoirs[J]. Natural Gas Geoscience, 2008 , 19(1) : 145 -147 . DOI: 10.11764/j.issn.1672-1926.2008.01.145
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