Method of treating subterranean formations

摘要

A subterranean formation is treated with a viscosified aqueous well treating composition which breaks into a thin fluid at temperatures in the range 100 DEG F to 300 DEG F. A breaker system is included in the compositions comprised of an alkali metal chlorite or hypochlorite breaker and a breaker activator comprised of copper II ion or an amine, or both.