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US 4,544,719 AGranted
Water-soluble polymers containing 2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS)-acrylamide-N,N-diallylacetamide
AssigneeNalco Chemical Company
InventorsDavid M. Giddings, Donald G. Ries, Allen R. Syrinek
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Abstract
Novel water-soluble terpolymers comprising: ______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 57-61 sulfonic acid, sodium salt (AMPS) acrylamide 20-35 N,N--diallylacetamide 4-23 ______________________________________ These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
Claims3
Novel water-soluble terpolymers having a molecular weight below 1,000,000 comprising:
- ______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 57-61 sulfonic acid, sodium salt (AMPS) acrylamide 20-35 N,N--diallylacetamide 4-23 ______________________________________
A novel water-soluble terpolymer comprising:
- ______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 58.4 sulfonic acid, sodium salt (AMPS) acrylamide 32.5 N,N--diallylacetamide 09.1 ______________________________________
Dependencies are inferred from the claim text.