A method for regulating the rheological properties of a fresh water - pue, drilling and an additive for carrying out the method

摘要

Method of controlling the rheology of a fresh water drilling fluid contaminated with salt by incorporating therein an admixture of a water soluble chromate and an ethylenedicarboxylic acid including the anhydride thereof, or mixture of said acid and the anhydride thereof in an amount of from about 0.5 to 10 pounds per barrel, a drilling method employing such a contaminated drilling fluid and containing said admixture, and a drilling fluid additive consisting of said admixture.