Patent ID: 7380601

Claim:
A method of treating a wellbore and a formation penetrated by the wellbore comprising a step of injecting a slurry of fibers and proppant in a viscous carrier fluid, wherein the viscosity of the carrier fluid in the absence of fibers is insufficient to prevent proppant settling during transport, wherein the fibers degrade after the treatment into products that do not precipitate in the presence of calcium or magnesium ions, and 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.