Method for breaking stabilized viscosified fluids

摘要

The present invention relates to a method of controllably breaking an aqueous based viscosified fluid containing a gel stabilizer such as sodium thiosulfate, when the fluid is within a subterranean formation having a temperature above about 175 DEG F. The method is accomplished by the incorporation of a particular selected breaker comprising an alkali metal chlorite or hypochlorite in the viscosified fluid containing the gel stabilizer. 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 200 DEG F. to about 300 DEG F.