Fluid loss additive with improved rheological properties

Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing

Reexamination Certificate

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C106S823000, C524S002000

Reexamination Certificate

active

07731793

ABSTRACT:
A polymeric fluid loss additive for hydraulic cement which includes a polymer component which exhibits delayed hydration. The fluid loss additive is suitable for use in cement slurries which may be subjected to elevated temperatures, as is common in oil and gas drilling operations. By way of the invention, cement slurries are provided which have improved fluid loss properties at high temperatures, while maintaining manageable rheologies that are conducive to mixing, pumping, and the like across a broad range of temperatures.

REFERENCES:
patent: 5336316 (1994-08-01), Dawson et al.
patent: 6739806 (2004-05-01), Szymanski et al.
patent: 7067000 (2006-06-01), Szymanski et al.
patent: 2006/0041060 (2006-02-01), George et al.

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