Zeng, Z-W. and Grigg, R.: "A Criterion for Non-Darcy Flow in Porous Media," Transport in Porious Media, (2006) 63: 57-69.
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.
Grigg, R.B., Zeng, Z-W. and Bethapudi, L.V.: “Comparison of Non-Darcy Flow of CO2 and N2 in a Carbonate Rock,” paper SPE 89471 presented at the SPE/DOE Fourteenth Symposium on Improved Oil Recovery, Tulsa, 17-21 April 2004.
Zeng, Z-W, Roegiers, J-C, and Grigg, R.B.: “Imaging the Initiation of Asymmetrical Hydraulic Fractures in Laboratory Experiments,” paper SPE 84578 prepared for presentation at the SPE ATCE, Denver, 5-8 October 2003.
Zeng, Z-W, Grigg, R.B., and Ganda, S.: “Experimental Study of Overburden and Stress Influence on Non-Darcy Gas Flow in Dakota Sandstone,” paper SPE 84069 presented at the SPE ATCE, Denver, 5-8 October 2003.