Horizontal natural gas storage caverns and methods for...

E - Fixed Constructions – 21 – B

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E21B 43/28 (2006.01) B65G 5/00 (2006.01) E21F 17/16 (2006.01)

Patent

CA 2174092

The invention provides caverns and methods for producing caverns in bedded salt deposits. In a preferred method, a first bore hole (19) is drilled into the salt formation (10) and a cavity (13) for receiving insolubles is leached from the salt formation (10). Thereafter, at a predetermined distance away from the first bore hole (19), a second hole (17) is drilled towards the salt formation. The drill drills through the salt formation in a horizontal direction until it intersects the cavity (13) for receiving insolubles. This produces a substantially horizontal conduit (20) from which solvent is controlledly supplied to the surrounding salt formation, leaching the salt and producing a concentrated brine which is removed through the first bore hole (19). Insoluble are collected in the cavity (13) for receiving insolubles. By controlledly supplying solvent, a horizontal cavern is produced with two bore holes (17 and 19) extending therefrom.

Cette invention concerne des cavernes et des procédés de production de cavernes dans des dômes de sel stratifiés. Selon un procédé préféré on fore un premier trou de forage (19) dans la formation saline (10) et on lixivie dans cette dernière (10) une cavité (13) destinée à recevoir des matières insolubles. On fore ensuite, à une certaine distance de premier trou de forage (19), un deuxième trou de forage (17) en direction de la formation saline. La foreuse effectue son travail dans la formation saline selon une direction horizontale jusqu'à ce qu'elle rencontre la cavité (13) destinée à recevoir des matières insolubles. Ceci produit un conduit sensiblement horizontal (20) par lequel on envoie de manière régulée du solvant dans la formation saline environnante, ce solvant lixivie le sel et produit une saumure concentrée qu'on extrait par le premier trou de forage (19). Les matières insolubles s'accumulent dans la cavité (13) prévue à cet effet. Le fait d'envoyer le solvant de manière régulée permet de produire une caverne horizontale d'où partent deux trous de forage (17 et 19).

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