Methods for breaking viscosified fluids

Details Methods for breaking viscosified fluids Methods for breaking viscosified fluids

1996-04-01

1997-09-23

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

1663051, 166308, 507215, 507216, 507217, 507258, 507903, 507921, 507922, E21B 4326

Patent

active

056694466

ABSTRACT:
The present invention relates to a method of breaking an aqueous based viscosified fluid having potassium ions present therein with a breaker comprising an alkali metal chlorite or hypochlorite through use of a breaker activator comprising a source of ammonium ion in the aqueous fluid. The method is particularly effective in providing a controlled break in a treatment fluid introduced into a subterranean formation having a static temperature in the range of from about 100.degree. F. to about 300.degree. F. In some instances, a second breaker activator comprising a source of thioglycolate ion also may be admixed with the viscosified fluid to further accelerate breaker activation at temperatures below about 200.degree. F.

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patent: 5497830 (1996-03-01), Boles et al.

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