Effect of Connate Water on Gas/Oil Relative Permeabilities for Water-Wet and Mixed-Wet Berea Rock

Abstract

SUMMARY Gas and oil relative permeabilities were measured on water-wet and mixed-wet Berea sandstone at various connate (initial) water satura- tion values, including zero, using the gasflood method. The centrifuge method was used to extend the measured oil relative permeability curves to lower total liquid saturations than could be achieved by gasflood. Composite cores were used in the gasfloods, whereas individual plugs were tested in the centrifuge. The results show that gas and oil relative permeabilities are indepen- dent of the connate water saturation in water-wet and mixed-wet Berea sandstone provided certain conditions are satisfied.