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 200 cc/30 min. 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.