Patent ID: 7579302

Claim:
A method of fracturing a subterranean formation, the method comprising: providing a treatment fluid comprising water, multivalent ions in an amount greater than about 10 millimoles per liter of the water, a complexing agent, and an anionic friction reducing polymer in an amount equal to or less than about 0.15% by weight of the treatment fluid, wherein the complexing agent is added to the water in an amount of from about 50% to about 200% of the normality of the multivalent ions in the water, wherein the complexing agent complexes with the multivalent ions such that free multivalent ions are present in an amount equal to or less than about 3 millimoles per liter of the treatment fluid, wherein the complexing agent is selected from the group consisting of a phosphate, a pyrophosphate, an orthophosphate, a citric acid, a gluconic acid, a glucoheptanoic acid, an ethylenediaminetetraacetic acid, a nitrilotriacetic acid, and combinations thereof; and introducing at least a portion of the treatment fluid into the subterranean formation at a pressure sufficient to create or enhance on or more fractures in the subterranean formation, wherein the friction reducing polymer reduces energy loss due to turbulence in the treatment fluid.