Patent ID: 7833950

Claim:
A wellbore treatment fluid comprising a slurry of fibers in a viscous carrier fluid, wherein the viscosity of the carrier fluid in the absence of fibers is insufficient to suspend proppant in the treatment fluid, wherein the fibers degrade after the treatment into products that do not precipitate in the presence of calcium or magnesium ions, wherein the fibers are selected from the group consisting of substituted and unsubstituted lactide, glycolide, polylactic acid, polyglycolic acid, copolymers of polylactic acid and polyglycolic acid, copolymers of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, copolymers of lactic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and mixtures thereof, and wherein the fibers have a denier of about 0.1 to about 20; and proppant.