Artificial underground cavern for storing natural gas in gas...

Details Artificial underground cavern for storing natural gas in gas... Artificial underground cavern for storing natural gas in gas...

E - Fixed Constructions

21

F

61/2.3

E21F 17/16 (2006.01) F17C 3/00 (2006.01)

Patent

CA 2004000

ABSTRACT OF THE DISCLOSURE The artificial underground cavern for high-pressure low-temperature storage of natural gas has a casing which is disposed a few centimeters away from the cavern wall and which terminates above the cavern floor. The cavern is sealed off from the atmosphere by a plug through which supply and discharge lines extend, the lines extending to the gap between the casing and the cavern wall and into the storage chamber. After venting of the cavern, water is forced into the gap by means of a pressure gas. This water, and a layer of water which is still present above the cavern floor, is then frozen by means of a liquid refrigerant circulating through the cavern interior, the refrigerant boiling and evaporating. When the cavern is filled with high- pressure low-temperature natural gas, methane hydrates are formed in the open places of the casing by contact with the ice and seal the casing in gas-tight manner relative to the surrounding rock.

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