Aqueous viscoelastic fluid

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/68 (2006.01) C09K 8/70 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2434357

The invention concerns an aqueous viscoelastic fluid for use in the recovery of hydrocarbons. According to the invention, the aqueous viscoelastic fluid comprises a monomer, a dimer or an oligomer of a viscoelastic surfactant able to form a viscoelastic gel under downhole conditions, said surfactant comprising a hydrophobic tail and a hydrophilic head, and being of the following formulae: R-X-Y-Z where R is the hydrophobic tail of the surfactant, Z is the hydrophilic head of the surfactant, said hydrophilic head being charged, X is a stabilising group and Y chain is a linear, saturated or unsaturated, hydrocarbon chain of 1, 2 or 3 carbon atoms or a branched, saturated or unsaturated hydrocarbon chain wherein the main chain is of 1, 2 or 3 carbon atoms, possibly incorporating an aromatic ring.

Cette invention concerne l'emploi d'un fluide visco-élastique aqueux pour la récupération d'hydrocarbures. Ce fluide visco-élastique aqueux comprend un monomère, un dimère ou un oligomère d'un tensioactif viscoélastique capable de former un gel viscoélastique en conditions de fond de trou. Ledit tensioactif, qui comprend une queue hydrophobe et une tête hydrophile, est représenté par les formules R-X-Y-Z suivantes. Dans ces formules, R est la queue hydrophobe du tensioactif, Z en est la tête hydrophile, laquelle est chargée, X est un groupe stabilisateur et Y une chaîne hydrocarbonée linéaire, saturée ou insaturée de 1, 2 ou 3 atomes de carbone ou bien une chaîne hydrocarbonée ramifiée, saturée ou insaturée, la chaîne principale comptant 1, 2 ou 3 atomes de carbone, éventuellement avec un noyau aromatique.

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