Fluid loss additives and methods

Wells – Processes – Cementing – plugging or consolidating

Reexamination Certificate

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C106S730000, C106S804000, C106S808000, C106S809000

Reexamination Certificate

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11164010

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.

REFERENCES:
patent: 4662943 (1987-05-01), Baker et al.
patent: 5900053 (1999-05-01), Brothers et al.
patent: 6626992 (2003-09-01), Vijn et al.
patent: 6796378 (2004-09-01), Reddy et al.
patent: 2003/0066460 (2003-04-01), Reddy et al.
patent: 2004/0255822 (2004-12-01), Reddy et al.
patent: 2110699 (1983-06-01), None
Natrosol Hydroxyethylcellulose-Physical and Chemical Properties, Hercules, Mar. 1998, 1-22, Aqualon, A Division of Hercules Incorporated.

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