Thickened acid composition and uses thereof

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C09K 3/00 (2006.01) C09K 8/74 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2483839

The present invention generally relates to aqueous, acidic compositions thickened with an amidoamine oxide gelling agent and/or viscoelastic surfactant of the general formula (I) wherein R1 is a saturated or unsaturated, straight or branched chain aliphatic group of from about 7 to about 30 carbon atoms, R2 is a divalent alkylene group of 2-6 carbon atoms which may be linear or branched, substituted or unsubstituted, and R3 and R4 are independently C1-C4 alkyl or hydroxyalkyl groups or together they form a heterocyclic ring of up to six members, and R5 is hydrogen or a C1-C4 alkyl or hydroxyalkyl group. The aforementioned gelling agents advantageously provide gels that do not undergo phase separation over extended periods of time and exhibit high heat stability. The Thickened acid gels of the invention have applications in household and industrial cleaners and degreasers, oilfield stimulation applications and the like.

L'invention concerne généralement des compositions acides aqueuses épaissies au moyen d'un agent de gélification d'oxyde d'amidoamine et/ou d'un agent de surface viscoélastique de formule (I). Dans cette formule, R¿1? désigne un groupe aliphatique à chaîne droite ou ramifiée, saturé ou insaturé, comportant environ 7 à 30 atomes de carbone, R¿2? désigne un groupe alkylène divalent de 2 à 6 atomes de carbone, pouvant être linéaire ou ramifié, substitué ou non substitué, et R¿3? et R¿4? sont indépendamment des groupes alkyle C¿1?-C¿4? ou hydroxyalkyle, ou forment ensemble un anneau hétérocyclique comportant jusqu'à 6 éléments, et R¿5? désigne hydrogène ou un groupe alkyle C¿1?-C¿4? ou hydroxyalkyle. Les agents de gélification susmentionnés permettent avantageusement de fournir des gels ne subissant pas de séparation de phase pendant des périodes prolongées, et présentant une stabilité élevée à la chaleur. Les gels acides épaissis de l'invention présentent des applications dans des détergents et dans des solvants de dégraissage ménagers et industriels, et des applications de stimulation de champ pétrolifère et analogues.

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