Experiments on Displacing Methane in Coal by Injecting Supercritical Carbon Dioxide

Storage of carbon dioxide in coal seams can reduce the effect of carbon dioxide on human lives and enhance the production of methane. The phase of carbon dioxide changes into the supercritical state in deep coal seams. This study reports two experiments at different conditions. In the first experiment, the permeability of supercritical carbon dioxide in briquettes is recorded, and in the second experiment, experiments of displacing methane by supercritical carbon dioxide are performed to better understand the displacement of methane by carbon dioxide. The experimental results show the exponential relation between the permeability and volume stresses. The amount of methane displaced by supercritical carbon dioxide is recorded with respect to volume stresses and temperatures. Sweep efficiency and displaced volume are used to estimate the production of methane.