Patent ID: 7297663

Claim:
An additive for preparing a weighted hardenable alkaline composition slurry for squeeze treatment of lost drilling fluid circulation in a subterranean thief zone which comprises from about 22.5 to about 50% by weight diatomaceous earth, from about 2 to about 30% by weight finely divided paper, from about 0.5 to about 30% by weight hydrophobic liquid, from about 9 to about 40% by weight micronized cellulose, and from about 9 to about 50% by weight lime, wherein the weight of the diatomaceous earth, finely divided paper, hydrophobic liquid, micronized cellulose and lime totals 100% wherein the additive is prepared by mixing together the finely divided paper with the hydrophobic liquid to adsorb the hydrophobic liquid on the finely divided paper, and thereafter mixing therewith the diatomaceous earth, the micronized cellulose, and the lime.