Clean-up additive for viscoelastic surfactant based fluids

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/524 (2006.01) C09K 8/536 (2006.01) C09K 8/68 (2006.01) E21B 37/06 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2610766

Clean-up additive compositions may be used to enhance the clean-up of VES- gelled aqueous fluids in a wide range .of .applications and VES fluid compositions, including use of an internal, breaker system. The compositions are microemulsions that may include, but npt necessarily be limited to, at least , one viscosity reducing agent, at least one solubiliidng agent, at least one desorptiÌn agent and at least one water wetting agent. One non- limiting embodiment of a specific microemulsion includes an unsaturated fatty acid oil, a glycol, a sorbitan ester/ethoxylated sorbitan ester mixture, and an alkyl sulfonate. Microemulsions may perform one or more of the following functions: keeping the reservoir water wet; keeping surface tension reduction low; demulsifying reservoir crude oils and aqueous VES fluids; dispersing and solubilizing the by-products generated when breaking the VES gel; and/or limiting the amount of VES residue on reservoir minerals.

L'invention concerne des compositions d'additif de nettoyage pouvant être utilisées afin d'améliorer le nettoyage de fluide aqueux gélifié par le tensioactif viscoélastique (VES) dans une large palette d'applications et des compositions fluidiques VES, comprenant notamment un système de rupture, un terme. Les compositions consistent en des émulsions pouvant contenir, entre autres, au moins, un agent de réduction de viscosité, au moins un agent de solubilisation, au moins un agent de désorption et au moins un agent de mouillage à l'eau. Un mode de réalisation non limitatif d'une micro-émulsion spécifique comprend de l'huile d'acide gras non saturée, un glycol, un mélange d'ester de sorbitane éthoxylé/sorbitane ester, et un sulfonate d'alkyle. Des micro-émulsions peuvent mettre en oeuvre une ou plusieurs des fonctions suivantes: le maintien humide de l'eau du réservoir, le maintien de la faible réduction de tension de surface; la désémulsification des pétroles bruts du réservoir et des fluides VES aqueux; la dispersion et la solubilisation des sous-produits générés lors de la rupture du gel VES; et/ou la limitation de la quantité de résidu VES sur des minéraux de réservoir.

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