SEARCH Articles Figures Tables 49 shows data of this type. The data represent a series of displacements through a sandpack with a permeability of 3,190 md. In the displacements, water or foaming-agent solution was displaced through the sandpack at different rates, holding the pressure gradient constant. A constant gas pressure was maintained at the injection face of the sandpack. The relative permeability to the gas and the gas saturation were measured. [Publishers Imprint]