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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Nov 26, 1985
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N/A
app pub date -
Feb 20, 1985
filing date -
Mar 23, 1984
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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 and copolymer salts 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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