Fluid loss additives and methods

Details Fluid loss additives and methods Fluid loss additives and methods

2005-11-07

2008-09-09

Suchfield, George (Department: 3676)

Wells

Processes

Cementing, plugging or consolidating

C106S730000, C106S804000, C106S808000, C106S809000

Reexamination Certificate

active

07422061

ABSTRACT:
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.

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Natrosol Hydroxyethylcellulose-Physical and Chemical Properties, Hercules, Mar. 1998, 1-22, Aqualon, A Division of Hercules Incorporated.

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