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

E - Fixed Constructions

21

B

E21B 43/28 (2006.01) E21C 25/60 (2006.01) E21F 17/16 (2006.01)

Patent

CA 2210866

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 comprises the following steps: - producing an injection duct (16), an extraction duct (18), and a void (4) for a communication space (14) which places in communication the injection and extraction ducts; - producing at least one blind tunnel void (2) 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 in to 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 solution is that the layer excavated has a mechanically stable shape and a larger volume and is produced more cheaply than with the prior art.

Cette invention concerne un procédé d'excavation par dissolution dans une mince couche souterraine de sel afin de constituer un réservoir de stockage de liquide. Selon la présente invention, le procédé comprend les étapes suivantes : création d'un conduit d'injection (16), d'un conduit d'extraction (18) et d'un vide (4) matérialisant un passage (14) reliant les deux conduits; création d'au moins un tunnel-impasse (2) communicant avec le passage pour permettre la circulation d'un solvant et la dissolution du sel dans le tunnel-impasse; injection d'un solvant dans le passage via le conduit d'injection; et extraction de la saumure obtenue via le conduit d'extraction. L'avantage de cette solution réside dans le fait que l'excavation conserve une forme structurellement stable pour un volume plus important et qu'elle est plus économique à réaliser que selon les méthodes connues.

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