Subterranean formation treating fluid concentrates, treating fluids and methods

An improved subterranean formation treating fluid prepared by:

• mixing water with a concentrate of a substantially fully hydrated depolymerized polymer having a polydispersity ratio of from 1 to about 12;
• and
• a crosslinking agent for crosslinking said substantially fully hydrated depolymerized polymer.

The treating fluid of claim 22 wherein said water is selected from the group consisting of fresh water, unsaturated salt water and saturated salt water.

A recyclable subterranean formation treating fluid prepared by:

• mixing with an aqueous treatment fluid recovered from a subterranean formation treatment containing depolymerized polymer additional water, a concentrate of a substantially fully hydrated depolymerized polymer to adjust the depolymerized polymer concentration to a desired level in the subterranean formation treating fluid and a crosslinking agent for crosslinking said substantially fully hydrated depolymerized polymer in said treating fluid.