Acidic internal breaker system for viscoelastic surfactant...

Details Acidic internal breaker system for viscoelastic surfactant... Acidic internal breaker system for viscoelastic surfactant...

E - Fixed Constructions

21

B

E21B 43/25 (2006.01) C09K 8/52 (2006.01) C09K 8/70 (2006.01)

Patent

CA 2636523

Compositions and methods are given for delayed breaking of viscoelastic surfactant gels inside formation pores, particularly for use in hydraulic fracturing. Breaking inside formation pores is accomplished without mechanical intervention or use of a second fluid. Acidic internal breakers such as sulfuric acid and nitric acid are used. The break may be accelerated, for example with a free radical propagating species, or retarded, for example with an oxygen scavenger.

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