OXIDATIVE INTERNAL BREAKER SYSTEM WITH BREAKING ACTIVATORS FOR VISCOELASTIC SURFACTANT FLUIDS

摘要

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 us e of a second fluid. Bromate oxidizing agents are used along with selected breaking activators for the bromate breaking compounds. Useful bromate breaking activators include acid-generating breaking activators, oxidizing sulfur containing breaking activators, and reducing agent breaking activators.