DISPERSANT COMPOSITIONS FOR SUBTERRANEAN WELL DRILLING AND COMPLETION

摘要

A dispersant for spacer fluids, cement slurries, completion fluids and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells. The dispersant may be a polymer, wherein the polymer is hydroxypropyl acrylate-acrylic acid copolymer; sulfonated vinyl toluene-maleic anhydride copolymer; sulfonated vinyl toluene-maleic acid copolymer; sulfonated methyl polyacrylamide; sulfonated ethyl polyacrylamide; sulfonated phenyl polyacrylamide; a copolymer of ethylenic acids, acrylamides and ethylenic esters of phosphoric acid; acrylic acid polymers; acrylamide polymers; sulfonated copolymers of acrylic acid and acrylamide; phosphonated copolymers of acrylic acid and acrylamide; or sulfonated and phosphonated copolymers of acrylic acid and acrylamide.