Methods of cementing in subterranean zones penetrated by well bores using biodegradable dispersants
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United States of America Patent
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Jan 27, 2004
Grant Date -
N/A
app pub date -
May 16, 2003
filing date -
May 16, 2003
priority date (Note) -
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Abstract
The present invention provides methods of cementing subterranean zones penetrated by well bores using biodegradable dispersants. A cement composition of the invention comprises a hydraulic cement, sufficient water to form a slurry and a water soluble biodegradable cement dispersant comprising a polyamide graft copolymer containing at least o e side chain formed from aldehydes and sulfur-containing acids or their salts.
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