Viscoelastic surfactant fracturing fluids and a method for...

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) C09K 8/66 (2006.01)

Patent

CA 2309460

Viscoelastic surfactant fluids for fracturing subterranean formations penetrated by a well bore. The surfactant fluids are comprised of an aqueous medium; an effective amount of an inorganic water soluble salt; and an effective amount of at least one surfactant selected from the group consisting of: i) anionic surfactants; ii) nonionic surfactants; and iii) hydrotropic surfactants. The surfactant compositions can be further stabilized and the viscosity increased by the addition of one or more hydrophobic organic alcohols. This invention also relates to a method for fracturing subterranean formations using said viscoelastic surfactant fluids.

L'invention concerne des fluides tensioactifs viscoélastiques permettant de fracturer des formations souterraines pénétrées par un puits de forage. Ces fluides tensioactifs renferment: un milieu aqueux; une quantité efficace d'un sel inorganique soluble dans l'eau; et une quantité efficace d'au moins un tensioactif choisi dans le groupe constitué par i) les tensioactifs anioniques; ii) les tensioactifs nonioniques; et iii) les tensioactifs hydrotopes. Ces compositions à base de tensioactifs peut par ailleurs être stabilisées, et leur viscosité améliorée, grâce à l'ajout d'un ou plusieurs alcools organiques hydrophobes. Cette invention concerne enfin un procédé permettant de fracturer des formations souterraines au moyen des fluides tensioactifs viscoélastiques susmentionnés.

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