Method and compositions for rheology modification of aqueous...

C - Chemistry – Metallurgy – 09 – K

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C09K 8/05 (2006.01)

Patent

CA 2552962

A method of making a rheology modified aqueous salt solution includes adding thereto, a non-hydratable clay, as defined, and at least one compound capable of contributing, in solution, a divalent metal cation and a trivalent metal cation; and then adjusting the pH to a specific range. A dry composition comprising at least one compound capable of contributing the designated cations and, optionally, the non-hydratable clay is also disclosed. This invention is particularly applicable to drilling fluids, and more particulady to such fluids used in coastal and deepsea drillsites where the presence of salinity has been known to significantly reduce the effectiveness of clays as thickening agents.

La présente invention concerne un procédé de modifier la rhéologie de solutions aqueuses de sels en y ajoutant, d'une part une argile non-hydratable selon l'invention, et au moins un composé capable d'apporter, dans la solution, un cation de métal divalent et un cation de métal trivalent, puis en ajustant le pH pour le faire tenir dans une plage spécifique. L'invention concerne également une composition sèche comprenant au moins un composé capable d'apporter les cations mentionnés, et éventuellement l'argile non-hydratable. L'invention convient particulièrement aux fluides de forage, et plus particulièrement à des fluides tels que ceux utilisés pour les sites de forage côtiers ou en eaux profondes, lorsqu'il est établi que la présence de la salinité atténue de façon notoire l'efficacité des argiles en tant qu'épaississants.

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