Patent ID: 7094737

Claim:
An additive comprising sugar cane ash having a particle size distribution of between 1 and 300 microns, and wherein said additive does not increase the viscosity of a well working fluid more than 10%, wherein the additive further comprises between 1 wt % and 15 wt % of an inert material selected from the group consisting of gravel, sand, dirt, silica and combinations thereof; and further comprising between 10 wt % and 50 wt % cellulose-like material selected from the group consisting of corn cobs, peat, paper, rice bran, oat hulls, cotton burrs, bagasse, wood, kenaf, rice hulls, rice bran, cottonseed hulls, soybean hulls, straw, peanut shells, nut shells, cotton, and mixtures thereof, provided that the cellulose like material has the particle size between 1 and 300 microns.