Polymers for use as filtration control aids in drilling muds
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United States of America Patent
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Mar 24, 1987
Grant Date -
N/A
app pub date -
Nov 23, 1984
filing date -
Nov 23, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The instant invention is directed to a polymer, having an intrinsic viscosity of 1.0 to 7.0, preferably 1.5 to 5.0, dl/g in 1.0M NaCl, prepared from: (A) 2.5 to 45%, by weight, of at least one unsaturated carboxylic acid, or its salt; (B) 5.0 to 85%, by weight, of at least one unsaturated sulfonic acid, or its salt; (C) 2.5 to 15%, by weight, of at least one unsaturated cationic-containing monomer; and (D) 0 to 90%, by weight, of at least one unsaturated non-ionic monomer. The instant invention is also directed to the polymer in combination with an aqueous clay dispersion and the use of the admixture as a filtration aid in drilling muds.
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