Rheology enhancers

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

Reexamination Certificate

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Details

C507S129000, C507S135000, C507S136000, C507S240000, C507S241000, C507S252000, C507S260000, C507S261000, C507S267000, C507S922000, C166S308200

Reexamination Certificate

active

07378378

ABSTRACT:
A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain applications, for example certain oilfield treatments, for example fracturing and gravel packing. Preferred surfactants are betaines and quaternary amines.

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