Device for the solution mining salt caverns

摘要

Method and apparatus for leaching out salt cavities for the storage of natural gas with the use of natural gas as blanket medium, with a pipe string (1) cemented in the overburden (11) and in the salt dome (13) down to the cavity roof (15), a gas-delivery string (3) put into the pipe string (1) in a sealed-off manner and likewise extending down to the cavity roof, a protective liquid filling the annular space between the pipe strings, an outer flushing-pipe string (6) put into the gas-delivery string, variable in length and extending down below the blanket level, and a inner flushing-pipe string (8) located underneath, put into the outer flushing-pipe string and variable in length. IMAGE