Hydrolytically stable polymers for use in oil field cementing methods and compositions
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United States of America Patent
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May 7, 1985
Grant Date -
N/A
app pub date -
Mar 23, 1984
filing date -
Mar 23, 1984
priority date (Note) -
Expired
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Abstract
Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain copolymers of N, N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between 1:4 and 4:1 respectively and average molecular weights of between about 75,000 and about 300,000.
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