A method for solution mining a cavern with a plurality of under caverns in a thin layer of

摘要

The invention has for its object a process and an installation for digging, by dissolving, a cavity in a field comprising at least one layer of salt). br / the invention advantageously proposes: & br / - dig a drill hole (8) in the layer of salt (1), & br / - provide, in the borehole, an injection duct (22), an extraction duct (24f), & br / - a plurality of blanks under - cavities (20a, 20b, 20c, 20d, 20e and 20f) in the layer of salt (1), and & br / - a succession of the isolated channels (24a, 24b, 24c, 24d, 24e) of said layer of salt, the channels connecting of a fluid manner the cavities in pairs to form an open circuit for circulation of the solvent, & br / - inject the solvent of the salt, in the communication space, & br / - remove the brine by the extraction pipe (24f). br / this solution makes it possible to increase the volume of the cavity when the thickness of the layer of salt is low.