Patent ID: 7169739

Claim:
A method for reducing sag in a fluid composition, comprising: combining a cystosol ester compound with a non-aqueous fluid and particles to reduce sag in the resulting fluid composition, wherein the particles comprise barite, galena, hematite, dolomite, calcite, or combinations thereof wherein the cystosol ester compound is represented by the following formula: wherein Ar is represented by the following formula: wherein in formula I, X=hydrogen, an alkyl group, an alkoxyl group, a nitro group, a halide group, a cyano group, an amino group, or an aryl group, and wherein in formula II, X═Y=Z=an alkoxy or an alkyl group; X=Y or Z with X, Y and Z being selected from the group consisting of hydrogen, an alkyl group, an alkoxyl group, a nitro group, a halide group, a cyano group, an amino group, and an aryl group; X═Y≠Z with X, Y, and Z being selected from the group consisting of hydrogen, an alkyl group, an alkoxyl group, a nitro group, a halide group, a cyano group, an amino group, and an aryl group; or X≠Y≠Z with X, Y, and Z being selected from the group consisting of hydrogen, an alkyl group, an alkoxy group, a nitro group, a halide group, a cyano group, an amino group, and aryl group.