Storing device for stored substance and method for storing stored substance

摘要

A filter (13) is provided on the tip of an injection well (9). Carbon dioxide that is stored in a carbon dioxide tank (3) is pressure-fed by a pressure-feeding device (5). The pressure-feeding device (5) sends the carbon dioxide in the carbon dioxide tank (3) into the injection well (9) with a pump. At this time, the carbon dioxide is maintained at or above a prescribed pressure and at or above a prescribed temperature in the pressure-feeding device by means of a pressure-adjusting valve, temperature adjuster, etc. and assumes a supercritical state. The supercritical carbon dioxide is sent to the injection well (9) in the direction of arrow A, passes through the filter (13) provided on the tip of the injection well (9) and is injected into a saline water-holding layer (11). The carbon dioxide injected into the saline water-holding layer (11) is made into micro-bubbles.