Method of reducing fluid loss in cement compositions which may contain substantial salt concentrations
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United States of America Patent
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Oct 20, 1987
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N/A
app pub date -
Mar 27, 1987
filing date -
Mar 27, 1987
priority date (Note) -
Expired
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Abstract
Cementing compositions having improved fluid loss capabilities for use in oil, gas, water and other well cementing operations are disclosed. Such compositions are comprised of water, hydraulic cement and a fluid-loss additive comprising a polymerization reaction product consisting essentially of 2-acryl-amido-2-methylpropanesulfonic acid or its salts, present in the product in an amount of from about 30 to about 90 mole percent, styrene present in the product in an amount of from about 5 to about 60 mole percent and acrylic acid or its salt comprising the balance of the product.
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