In recent years,polyacrylamide and its derivatives are widely used in the oil industry for EOR,which becomes an important method to enhance oil recovery.This kind of polymer has good viscosity effect and flocculation efficiency,but they are also sensitive to salt and have poor shear stability and poor thermal stability.Focusing on the characters of polymers using in oilfields at present and the design of the copolymer structure,we have developed a new kind of anion temperature-tolerant and salt-res...