Zeng, Z-W, Grigg, R.B., and Gupta, D.B.:
“Laboratory Investigation of Stress-Sensitivity of Non-Darcy Gas Flow Parameters”
paper SPE 89431 presented at the SPE/DOE Fourteenth Symposium on Improved Oil Recovery, Tulsa, 17-21 April 2004.

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Abstract

Non-Darcy flow parameters were investigated in 159 series of high pressure/high temperature/high velocity gas flooding experiments on five different rock samples under field reservoir conditions. The results of these experiments reconfirm and extend to new conditions that permeability increase, while non-Darcy flow coefficient decreases with effective stresses; both are independent of shear stresses. General formulas have been developed to quantify the stress-sensitivity in terms of nominal non-Darcy parameters. General equations have been proposed to predict the change of permeability and non-Darcy flow coefficient with given effective stresses and nominal non-Darcy flow parameters.