Mutual solvent-soluble and/or alcohol blends-soluble...

C - Chemistry – Metallurgy – 09 – K

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C09K 8/68 (2006.01) E21B 43/27 (2006.01)

Patent

CA 2724402

Solid, particulate dicarboxylic acids may be fluid loss control agents and/or viscosifying agents for viscoelastic surfactant (VES) fluids In treatments such as well completion or stimulation; in hydrocarbon recovery operations. The fluid loss control agenls may include, but not be limited to, dodecanedioic acid, undecanedioic acid, decanedioic acid, azalaic acid, suberic acid, and mixtures thereof having a mesh size of from about 20 mesh to about 400 mesh (about 841 to about 38 microns). A mutual solvent or blend of at least two alcohols subsequently added to the aqueous viscoelastic surfactant treating fluid will at least partially dissolve the solid, particulate dicarboxylic acid fluid loss control agents, and optionally also 'break" or reduce the viscosity of the aqueous viscoelastic surfactant treating fluid.

Linvention concerne des acides dicarboxyliques particulaires solides qui peuvent être des agents de contrôle de perte de fluide et/ou des améliorants de viscosité pour des fluides tensioactifs viscoélastiques (VES) dans des traitements tels que des complétions ou des stimulations de puits lors d'opérations de récupération d'hydrocarbures. Les agents de contrôle de perte de fluide peuvent comprende, mais pas exclusivement, de l'acide dodécanoïque, de l'acide undécanoïque, de l'acide azélaïque, de l'acide subérique ou leurs mélanges, présentant un calibre d'environ 20 à 400 mesh (environ 841 à 38 microns). Un solvant mutuel ou un mélange d'au moins deux alcools ajouté subséquemment au fluide tensioactif viscoélastique aqueux de traitement va dissoudre au moins partiellement les acides dicarboxyliques particulaires solides, agents de contrôle de perte de fluide, et éventuellement, "casser" aussi ou réduire la viscosité du fluide tensioactif viscoélastique de traitement.

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