Fluid loss additive for cement slurries containing a n-vinyl-2-pyrrolidone-.omega.-2-acrylamido-2-methylpropane sulfonate-.omega.-acrylic acid-.omega.-acrylamide polymer
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United States of America Patent
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Apr 28, 1992
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N/A
app pub date -
Dec 22, 1989
filing date -
Mar 23, 1987
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Expired
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Abstract
An additive for reducing water loss from cement comprising a tetrapolymer, base, an electrolyte, at least one surfactant, and water is disclosed. A process for producing cement slurries with improved water loss properties, as well as an improved method for cementing gas and oil wells is also disclosed.
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