E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/28 (2006.01) E21B 43/30 (2006.01) E21F 17/16 (2006.01)
Patent
CA 2216029
The subject of the invention is a process and an installation for hollowing out a cavity, by dissolution, in a ground formation comprising at least one layer of salt. The invention proposes advantageously to: - drill a hole (8) in the layer of salt (1), - provide in the drilled hole an injection pipe (22), an extraction pipe (24f), - a plurality of preliminary sub-cavities (20a, 20b, 20c, 20d, 20e, 20f) in the layer of salt (1), and - a succession of channels (24a, 24b, 24c, 24d, 24e) isolated from the said layer of salt, the channels connecting the sub-cavities in a fluid manner two at a time in order to form an open circuit for circulation of the solvent, - inject a solvent of the salt, into the communication space, - extract the brine through the extraction pipe (24f). This solution makes it possible to increase the volume of the cavity when the layer of salt is not very thick.
Cette invention concerne un procédé et une installation de creusement dissolutif d'une cavité dans une formation souterraine comportant au moins une couche de sel. L'invention prévoit de : forer un trou (8) jusqu'à la formation de sel (1); de placer dans ce trou un tuyau d'injection (22) et un tuyau d'extraction (24f); de réaliser une série de cavités préliminaires (20a, 20b, 20c, 20d, 20e, 20f ) dans la couche de sel (1) et une série de canaux (24a, 24b, 24c, 24d, 24e) isolés de ladite couche de sel et raccordant lesdites cavités deux à deux de manière à former un circuit ouvert pour la circulation d'un solvant; d'injecter un solvant et d'extraire la saumure par le tuyau d'extraction (24f). Cette solution permet d'agrandir la cavité lorsque la couche de sel n'est pas épaisse.
Boris Guy
Charnavel Yvon
Durup Jean-Gerard
Adams Patent & Trademark Agency
Gaz de France
LandOfFree
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