Patent ID: 8088719

Claim:
A crosslinked treatment fluid comprising: an aqueous base fluid comprising a brine; a crosslinking agent; and a gelling agent comprising a polymer that is a crosslinkable polymer wherein the crosslinkable polymer is a polymer selected from the group consisting of gum arabic, gum ghatti, gum karaya, tamarind gum, tragacanth gum, guar gum, locust bean gum, cellulose, a derivative thereof, and a combination thereof, and a polymer that is a biopolymer, wherein the biopolymer is not crosslinked by the crosslinking agent, and wherein a molecule of the biopolymer (1) consists only of glucose, or (2) has a backbone comprising one or more units that comprise at least (a) one glucose unit and (b) one linear or cyclic pyranose-type monosaccharide unit, wherein (a) and (b) have different molecular structures.