Viscoelastic surfactant fluids and related methods of use

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component

Reexamination Certificate

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C507S240000, C507S245000, C507S922000, C166S308200, C166S308300, C166S308600

Reexamination Certificate

active

10684828

ABSTRACT:
Viscoelastic surfactant based aqueous fluid systems useful as thickening agents in various applications, e.g. to suspend particles produced during the excavation of geologic formations. The surfactants are zwitterionic/amphoteric surfactants such as dihydroxyl alkyl glycinate, alkyl ampho acetate or propionate, alkyl betaine, alkyl amidopropyl betaine and alkylimino mono- or di-propionates derived from certain waxes, fats and oils. The thickening agent is used in conjunction with an inorganic water-soluble salt or organic additive such as phthalic acid, salicylic acid or their salts.

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