Methods and cement compositions for cementing in subterranean zones
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United States of America Patent
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Mar 23, 2004
Grant Date -
N/A
app pub date -
Nov 19, 2002
filing date -
Nov 19, 2002
priority date (Note) -
Expired
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Abstract
Methods of cementing in subterranean zones, improved cement compositions and improved additives are provided. The compositions are basically comprised of a hydraulic cement, sufficient water to form a slurry and an additive for providing improved rheology, fluid loss control and set retardation comprised of carboxymethylhydroxyethylcellulose having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution and a 2% by weight aqueous solution of the carboxymethylhydroxyethylcellulose has a Hoppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s.
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