Changes in reservoir properties from injection of supercritical CO2 into coal seams — A laboratory study

Two Australian Permian coals of similar rank but different texture, one predominantly dull and the other predominantly bright, were investigated in laboratory experiments to assess changes in reservoir properties following exposure to supercritical CO2 (SCCO2) and water. Both powdered coal (0.180–0.220 mm) and small cubes (15 mm to a side) were tested in a high-pressure (HP) batch reactor for up to 120 h. Two reaction fluids were used, each on...