Fluid loss additives and methods

Details Fluid loss additives and methods Fluid loss additives and methods

C - Chemistry, Metallurgy

09

K

C09K 8/487 (2006.01) C04B 24/38 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2490928

Nonionic derivatized starch of varying degrees of substitution may be used as a fluid loss additive for well bore cementing operations. A well bore cementing composition may include a cement and a nonionic derivatized starch, the nonionic derivatized starch in a concentration in the cement to provide a fluid loss of less than 200cc/30min. A method for cementing subterranean zones penetrated by a well bore may include: providing a cement slurry including mix water, hydraulic cement and a nonionic derivatized starch as an additive for fluid loss control in well cementing applications; pumping the cement slurry into a well; and holding the cement slurry in place until it sets.

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