Viscosity reduction of viscoelastic surfactant based fluids

Details Viscosity reduction of viscoelastic surfactant based fluids Viscosity reduction of viscoelastic surfactant based fluids

2005-04-19

2005-04-19

Tucker, Philip C. (Department: 1712)

Earth boring, well treating, and oil field chemistry

Well treating

Contains organic component

C507S239000, C507S240000, C507S252000, C507S266000, C507S269000, C507S267000, C507S277000, C507S921000, C507S922000, C166S308200, C166S308300

Reexamination Certificate

active

06881709

ABSTRACT:
Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.

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