Non-retarding fluid loss additives for well cementing...

Details Non-retarding fluid loss additives for well cementing... Non-retarding fluid loss additives for well cementing...

E - Fixed Constructions

21

B

31/22

E21B 33/14 (2006.01) C04B 24/26 (2006.01) C04B 28/02 (2006.01) C09K 8/46 (2006.01)

Patent

CA 1224916

ABSTRACT A well bore cementing composition and method are shown in which a hydraulic cement, water and a non-retarding fluid loss additive are combined to form a cementing slurry. The non-retarding fluid loss additive is a copolymer of a first non-lonic water soluble monomer which resists hydrolyzing in a cement slurry 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.

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