US Patent 11414273 System and method for compressed air energy storage

Storage vessel, system and method for storing compressed gas are provided. A storage vessel for storing compressed gas comprises a wellbore provided in the subsurface; a casing placed within the wellbore and cemented to the formation, the casing defining a volumetric space within the wellbore for storing the compressed gas; and at least one flow regulator sealed at a top end of the casing for selectively injecting the compressed gas into the space or discharging the compressed gas from the space, wherein the wellbore has a volumetric capacity of at least 20 m3, and wherein the compressed gas has a pressure of at least 5 MPa.