Methods of retarding cementitious compositions
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United States of America Patent
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Feb 16, 1999
Issued Date -
N/A
app pub date -
Apr 1, 1997
filing date -
Aug 7, 1996
priority date (Note) -
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Abstract
The present invention provides set retarding additives, set retarded hydraulic cement compositions and methods of using the set retarded cement compositions for cementing subterranean zones in wells. A preferred set retarding additive comprises an alkanolamine salt produced by the reaction of a hydroxy carboxy acid, such as tartaric acid, gluconic acid or glucoheptonic acid, with an alkanolamine, such as monoethanolamine, diethanolamine or triethanolamine.
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