Fluids containing viscoelastic surfactant and methods for...

C - Chemistry – Metallurgy – 11 – D

Patent

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C11D 1/88 (2006.01) B01F 17/00 (2006.01) C05G 3/00 (2006.01) C10C 3/00 (2006.01) C11D 1/90 (2006.01) C11D 1/94 (2006.01) C11D 3/02 (2006.01) C11D 3/20 (2006.01) C11D 17/00 (2006.01) E21B 43/26 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2297185

Viscoelastic surfactant based aqueous fluid systems useful as thickening agents in various applications, e.g. to suspend particles produced during the excavation of geologic formations. The surfactants are zwitterionic/amphoteric surfactants such as dihydroxyl alkyl glycinate, alkyl ampho acetate or propionate, alkyl betaine, alkyl amidopropyl betaine and alkylamino mono- or di-propionates derived from certain waxes, fats and oils. The thickening agent is used in conjunction with an inorganic water-soluble salt or organic additive such as phthalic acid, salicylic acid or their salts.

L'invention concerne des systèmes fluides aqueux à base de tensioactifs viscoélastiques s'utilisant comme épaississants dans plusieurs applications, comme par exemple pour la mise en suspension de particules produites lors de l'excavation de formations géologiques. Les tensioactifs sont des tensioactifs zwittérioniques/amphotères tels que le dihydroxyl alkyl glycinate, l'alkyl ampho acétate ou propionate, l'alkyl bétaïne, l'alkyl amidopropyl bétaïne et les alkylimino mono- ou di-propionates provenant de certaines cires, matières grasses ou huiles. L'épaississant est utilisé conjointement avec un sel inorganique soluble dans l'eau ou un additif organique tel que l'acide phtalique, l'acide salicylique ou leurs sels.

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