Viscoelastic acid

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/035 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2547522

An acidic viscoelastic surfactant fluid composition is formulated with an acid, for example hydrochloric acid, a cationic surfactant, for example a quaternary amine, and a break-enabling salt, for example NH4Cl. The fluid composition has low viscosity as formulated, undergoes an increase in viscosity as the acid is consumed when it reacts with an acid-reactive material, and returns to approximately the initial viscosity as the last of the acid is consumed. The fluid composition is used as a diverting fluid or as the main treatment fluid in oilfield treatments such as matrix acidizing and acid fracturing.

Composition fluide tensioactive viscoélastique acide formulée avec un acide, par exemple l'acide chlorhydrique, un tensioactif cationique, par exemple une amine quaternaire, et un sel autorisant une rupture, par exemple NH4Cl. Cette composition fluide présente une faible viscosité telle qu'elle est formulée, sa viscosité augmente à mesure que l'acide est consommé lors de la réaction avec un produit susceptible de réagir avec les acides, et ladite viscosité revient approximativement à la valeur de viscosité initiale au moment où s'achève la consommation de l'acide. Ladite composition fluide sert de fluide de déviations ou de fluide de traitement principal dans les traitements de champs de pétrole tels que l'acidification matricielle et la facturation à l'acide.

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