1. Zeng, Z-W. and Grigg, R.: "A Criterion for Non-Darcy Flow in Porous Media," Transport in Porious Media, (2006) 63: 57-69.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. Li, D., Svec, R.K., Engler, T.W., and Grigg, R.B.: “Modeling and Simulation of the Wafer Non-Darcy Flow Experiments,” paper SPE 68822 presented at the SPE Western Regional Meeting, Bakersfield, 26-30 March 2001.
  7. Grigg, R.B. and Hwang, M.K., “High Velocity Gas Flow Effects in Porous Gas-Water System,” paper SPE 39978 presented at the 1998 SPE Gas Technology Symposium, Calgary, 15-18 March.