Patent ID: 7863362

Claim:
A density-matched particle slurry comprising: a carrier liquid; a plurality of core particles within the carrier liquid; a density-matching material coated on the surfaces of the core particles wherein a majority of the density-matched core particles bearing the density-matching material have a combined density substantially equal to that of the carrier liquid, where the density-matching material is soluble and dispersible in the carrier liquid at a temperature above about 100Â° F. (about 38Â° C.); and a plurality of relatively high density particulates having a mean particle diameter ranging from about 0.25 to about 20 Î¼m, the relatively high density particulates contacting with the density-matching material or the core particles or both, where the relatively high density particulates increase the density of the density-matched particles to assist in permitting the density of the density-matched core particles bearing the density-matched material to have a combined density substantially equal to that of the carrier liquid where the polymer core particles can dissolve in a hydrocarbon within 5 minutes.