Self-diverting foamed system

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01)

Patent

CA 2532750

A method is given for diverting acids in matrix acidizing and acid fracturing. The acids are diverted with a diverting agent that is an energized or foamed acidic viscoelastic surfactant system that contains a viscoelastic surfactant that gels and increases in viscosity when the acid in the foamed acidic viscoelastic surfactant system is spent. The method provides a synergistic combination of the diverting capabilities of foams and the diverting capabilities of viscoelastic gel systems. The resistance to flow of the gelled foamed viscoelastic surfactant system is greater than expected from a foam or a viscoelastic gel system alone.

Procédé de dérivation d'acides dans l'acidification matricielle et la fracturation à l'acide. Les acides sont dérivés au moyen d'un agent de dérivation composé d'un système tensioactif viscoélastique acide, expansé ou stimulant, qui contient un tensioactif viscoélastique qui se gélifie et augmente en viscosité lorsque l'acide dans le système tensioactif viscoélastique acide expansé est épuisé. Ce procédé permet d'associer de manière synergique les aptitudes de dérivation des mousses et les aptitudes de dérivation des systèmes de gels viscoélastiques. La résistance à l'écoulement du système tensioactif viscoélastique acide, expansé et gélifié, est supérieure à celle attendue d'un système de gel viscoélastique ou d'une mousse, utilisés séparément.

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