Henkel Corporation

Diamond Shamrock Chemicals Company

Diamond Shamrock Chemical

Albert L Resnick

Arpad Savoly

Jose L Villa

Christopher M Garvey

Joseph V Sinka

Dinshaw F Bardoliwalla

Edwin L Kelley

Copolymers of (1) from about 80% to about 98% by weight of acrylic acid and (2) from about 2% to about 20% by weight of itaconic acid and having a weight average molecular weight of between about 100,000 to about 800,000 and which are at least water dispersible are useful as retention aids for paper coating compositions.

Water retention aids

Drilling fluid compositions and methods of using such compositions in oil, gas and water well drilling fluid operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate a terpolymer formed from (a) a vinyl containing alkyl or aromatic substituted sulfonate selected from the group consisting of 2-acrylamido, 2-methyl propane sulfonic acid (AMPS), sodium vinyl sulfonate or vinyl benzene sulfonate, and method salts thereof at about 10 to 75 weight percent in the polymer; (b) an unsaturated polybasic acid such as itaconic acid at about 1 to 60 weight percent; and metal salts thereof and (c) a nonionic monomer selected from the group consisting of acrylamide, N, N-dimethylacrylamide, N-vinyl pyrrolidone, N-vinyl acetamide, or dimethylamino ethyl methacrylate and metal salts thereof at about 10 to 76 weight percent. The terpolymer should have a molecular weight between 200,000 to 1,000,000. The preferred terpolymer comprises AMPS, acrylamide and itaconic acid. The polymers are used as fluid loss control additives for aqueous drilling fluids and are particularly advantageous when used with lime or gypsum based drilling muds containing soluble calcium ions.

Fluid loss control additives and drilling fluids containing same

Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate a terpolymer formed from (a) an acid monomer selected from the group consisting of 2-acrylamido, 2-methyl propane sulfonic acid (AMPS), sodium vinyl sulfonate or vinyl benzene sulfonate, and metal salts thereof at about 10 to 75 weight percent in the polymer; (b) an unsaturated polybasic acid such as itaconic acid at about 1 to 60 weight percent; and metal salts thereof and (c) a nonionic monomer selected from the group consisting of acrylamide, N, N dimethylacrylamide, N-vinyl pyrrolidone, N-vinyl acetamide, or dimethylamino ethyl methacrylate and metal salts thereof at about 10 to 76 weight percent. The terpolymer should have a molecular weight between 200,000 to 1,000,000. The preferred terpolymer comprise AMPS, acrylamide and itaconic acid. The polymer is used as a fluid loss agent in oil well cementing in conjunction with dispersants, like naphthalene sulfonate formaldehyde condensate alkali salt, a polymer of ketone aldehyde sulfonate alkali salt, or lignosulfonate. At the same time, all of the above can be used in freshwater to saturated NaCl or seawater cement slurries where HEC fluid loss additive does not work.

Fluid loss agents for oil well cementing composition

Growing community of inventors

Edison, NJ, United States of America

Albert L Resnick