Additives for preparing rheology-modified aqueous fluids

C - Chemistry – Metallurgy – 09 – K

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C09K 8/05 (2006.01) B01J 13/00 (2006.01)

Patent

CA 2500840

A rheology modified aqueous fluid composition comprising clay, water, magnesium oxide, aluminum oxide hydroxide, sodium carbonate or potassium carbonate, and calcium oxide or calcium hydroxide. The magnesium oxide and aluminum oxide hydroxide are prepared by a specific thermal treatment protocol involving heating of appropriate precursors within a specified temperature range. The pH of the composition is at least about 10. The composition is prepared by admixing the components and, optionally, sodium oxide or sodium hydroxide for pH adjustment as necessary. A substantially dry rheology modification agent comprising the enumerated components, not including the water, is also included. The resulting composition preferably exhibits shear- thinning capability including very rapid thinning upon application of shear forces and also rapid viscosification upon removal of such forces.

La présente invention concerne une composition de fluides aqueux modifiés par rhéologie, qui comprend de l'argile, de l'eau, un oxyde de magnésium, un hydroxyde d'oxyde d'aluminium, un carbonate de sodium ou un carbonate de potassium et un oxyde de calcium ou un hydroxyde de calcium. L'oxyde de magnésium et l'hydroxyde d'oxyde d'aluminium sont préparés par un protocole de traitement thermique spécifique qui consiste à chauffer des précurseurs appropriés ans une plage de température spécifiée. Le pH de cette composition est d'environ 10. Cette composition est préparée par le mélange de composants et, éventuellement, d'oxyde de sodium ou d'hydroxyde de sodium pour le réglage du pH, le cas échéant. Cette invention concerne aussi un agent de modification de rhéologie sensiblement sec comprenant les composants énumérés, exceptée l'eau. La composition résultante présente de préférence une capacité de fluidification comprenant une fluidification rapide lors de l'application de forces de cisaillement et une viscosification lors de la suppression de ces forces.

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