Subterranean formation treating fluid concentrates, treating fluids and methods

An improved method of treating a subterranean formation penetrated by a well bore whereby one or more fractures are formed therein comprising the steps of:

• (a) preparing a gelled and crosslinked fracturing fluid by mixing water, a substantially fully hydrated depolymerized polymer, and crosslinking agent for crosslinking said substantially fully hydrated depolymerized polymer;
• (b) contacting said subterranean formation with said gelled and crosslinked fracturing fluid under conditions effective to create at least one fracture in said subterranean formation;
• and
• (c) mixing a proppant material with at least a portion of said crosslinked fracturing fluid.