Oil with a surface tension of 0.01 N/m is trapped in a bed of material with permeability of 1x10^-10 m^2 and a length of 150 m. We want to push the oil out of the bed by pumping in an extraction fluid (neglect the properties of this fluid) at 12000 kPa. When the oil stops coming out, what fraction of oil will be left in the bed?
