Delayed breaker for viscoelastic surfactant-based fluids

• Main Authors: LI LINGLING, WOLF NICK HENRY, ZHOU JIAN, GADBERRY JAMES FREDERIC
• Format: Patent
• Language: Chinese; English
• Published: 29.08.2017
• Subjects: ADHESIVES; CHEMISTRY; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES

Compositions and methods are provided for delayed breaking of viscoelastic surfactant gels inside subterranean formations. Breaking is accomplished without mechanical intervention or use of a second fluid. The delayed breaking agent is selected from alkyl ether phosphates and salts thereof, alkylaryl ether phosphates and salts thereof, alkyl sulfates and salts thereof, alkylaryl sulfates and salts thereof, alkyl ether sulfates and salts thereof, alkylaryl ether sulfates and salts thereof, and mixtures of any of the foregoing. The viscoelastic surfactant can be a zwitterionic surfactant, and can be selected from the group consisting of sultaines, betaines, and amidoamine oxides. 本发明提供用于使地层内粘弹性表面活性剂凝胶延迟破坏的组合物和方法。破坏在没有机械干预或使用第二流体下进行。延迟破坏剂选自烷基醚磷酸酯及其盐，烷基芳基醚磷酸酯及其盐，烷基硫酸酯及其盐，烷基芳基硫酸酯及其盐，烷基醚硫酸酯及其盐，烷基芳基醚硫酸酯及其盐，以及前述任种的混合物。粘弹性表面活性剂可以是两性离子表面活性剂，并且可以选自磺基甜菜碱、甜菜碱和酰胺基胺氧化物。