The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1987
Filed:
Sep. 26, 1986
Arpad Savoly, Martinsville, NJ (US);
Jose L Villa, Bridgewater, NJ (US);
Christopher M Garvey, Wilmington, DE (US);
Albert L Resnick, Edison, NJ (US);
Diamond Shamrock Chemicals Company, Dallas, TX (US);
Abstract
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.