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US 4,544,722 AGranted
Water-soluble terpolymers of 2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS), n-vinylpyrrolidone and acrylonitrile
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- 58-77 sulfonic acid, sodium salt (AMPS) N--vinylp;yrrolidone 2-20 acrylonitrile 4-36 ______________________________________ 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- 58-77 sulfonic acid, sodium salt (AMPS) N--vinylp;yrrolidone 2-20 acrylonitrile 4-36 ______________________________________
A novel water-soluble terpolymer comprising:
- ______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 58.9 sulfonic acid, sodium salt (AMPS) N--vinylpyrrolidone 08.3 acrylonitrile 32.8 ______________________________________
Dependencies are inferred from the claim text.