Process for excavating a cavity in a thin salt layer

Details Process for excavating a cavity in a thin salt layer Process for excavating a cavity in a thin salt layer

1997-07-17

1999-09-28

Bagnell, David J.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Input and output wells

405 58, E21B 4328, E21F 1716

Patent

active

059575395

ABSTRACT:
The invention concerns a process for excavating by dissolution an underground cavity in a thin salt layer, in order to store a fluid therein. According to the invention, the process includes the steps of producing an injection duct, an extraction duct, and a void for a communication space which places in communication the injection and extraction ducts, producing at least one blind tunnel void communicating with the communication space so as to enable the solvent to circulate and the salt to dissolve in the blind tunnel, injecting via the injection duct a solvent into the communication space, and extracting via the extraction duct the brine formed by the dissolution of the salt on contact with the solvent. The advantage of this process is that the excavated layer has a mechanically stable shape and a larger volume and is produced more cheaply than with prior processes.

REFERENCES:
patent: 2822158 (1958-02-01), Brinton
patent: 3339978 (1967-09-01), Helvenston
patent: 3347595 (1967-10-01), Dahms et al.
patent: 3510167 (1970-05-01), Carmody
patent: 3873156 (1975-03-01), Jacoby
patent: 4411474 (1983-10-01), Higgins
patent: 5246273 (1993-09-01), Rosar

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