Co 5(% /wobsummary.The results of an experimental research program to investigate the effects of immobite liquid saturations on the non-Darcy flow coefticieitt are presented. Sandstone cores of absolute permeabilities ranging from 50 to 800 md were used to investigate non-Darcy flow phenomena under mtdtiphase conditions. Immobile liquid saturations were varied from 8 to 30% PV. The multiphase experiments were conducted with N* gas as the flowing phase and glycerin as the imrnObile liquid P~se. It was found that the non-Darcy flow coefficient for the multiphase case may be estimated with a dry-core non-Darcy-flow-coefficient/ permeability relationship developed for the rock in question and the effective gas permeabiliV at a given saturation.For the immobile multiphase cases, the non-Darcy flow coefficient consistently increised with increased ?.aNrarion. The experimental data obtained from this research were compared with the limited mukiphase data in the Ikeratme. Where comparisons could be made, the daq rcpmted in this paper agreed favorably with the existing published &ta.An analysis of the experimental data revealed that a unique relationship existed between the non-Darcy flow coefficient and the effective gas permeability, porosity, liquid saturation, and effective overburden pressure at a given ti,mperantre.(@relations were developed from this analysis to prtilct the non-Darcy flow coefficient as a function of rock and fluid properties. Where possible, the correlations were used to predict the nomDamy coeftkient measmed by other researchers and were compared with the dry-core correlations developed "by liudcek and Katz and with a theoretical equation developed by Geemma.