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:
Sep. 09, 1986
Filed:
Dec. 19, 1984
Applicant:
Inventors:
Dyke W Reese, Bakersfield, CA (US);
Ray S Pace, Arlington, TX (US);
Lee F McKenzie, Merriman, UT (US);
Assignee:
Hughes Tool Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166293 ; 106 90 ; 166295 ; 523130 ;
Abstract
A well bore cementing composition and method are shown in which a hydraulic cement, water and fluid loss additive are combined to form a cementing slurry. The fluid loss additive is a copolymer of a first monomer of dimethyl-diallyl ammonium chloride and a second anionic monomer. The monomer ratio of the non-ionic, water soluble monomer to the anionic monomer is in the range from about 85:15 to 95:5, and the copolymer has a molecular weight in the range from about 200,000 to 400,000.