Sub- and super-critical carbon dioxide permeability of wellbore materials under geological sequestration conditions: An experimental study

► Geopolymer (G), sandstone (S) and G-S composite wellbore materials were used. ► Carbon dioxide permeability was studied under Sub and super critical CO2 pressures. ► The permeability of sandstone is 1000 times higher than geopolymer. ► The apparent permeability reduces with increase in inlet and confining pressures. ► Percentage permeability reduction of all materials reduces with increase in pore pressure.