High temperature stable aqueous brine fluids viscosified by water-soluble copolymers of acrylamidomethylpropanesulfonic acid salts

摘要

An aqueous brine fluid is disclosed which contains a high salt concentration and a water-soluble copolymer of acrylamidomethylpropanesulfonic acid salts which serves to increase the viscosity thereof, particularly at elevated temperatures of above about 300 DEG F. These fluids are particularly useful as fluids for drilling operations.