TERPOLYMERS FOR USE AS HIGH TEMPERATURE FLUID LOSS ADDITIVE AND RHEOLOGY STABILIZER FOR HIGH PRESSURE, HIGH TEMPERATURE OIL WELL DRILLING FLUIDS

摘要

ABSTRACT OF THE DISCLOSURENovel water-soluble terpolymers comprising:Ingredients Mole %2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS) 51-59N,N-dimethylacrylamide 6-28acrylonitrile 20-35These terpolymers provide high temperature fluid loss additives andrheology stabilizers for high calcium-containing brine clay drillingfluids.