C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
31/23, 402/322
C08F 228/02 (2006.01) C08F 220/58 (2006.01) C09K 8/24 (2006.01)
Patent
CA 1221792
ABSTRACT OF THE DISCLOSURE Novel water-soluble terpolymers comprising: Ingredients Mole % 2-acrylamido-2-methylpropane- sulfonic acid, sodium salt (AMPS) 51-59 N,N-dimethylacrylamide 6-28 acrylonitrile 20-35 These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
462353
Giddings David M.
Ries Donald G.
Syrinek Allen R.
Nalco Chemical Company
Smart & Biggar
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