In order to improve the viscosity-increasing performance of polyacrylamide solution in high temperature and high salt reservoir

the common method is to introduce association and salt-resistant monomer in the synthesis process. However

with the development of monomer synthesis technology

some temperature-sensitive copolymers appear. At present

there are few researches on the oil displacement performance of these polymers. For this reason

conventional binary copolymer AM-NaAA and temperature sensitive terpolymer AM-NaAA-RTM have been selected

and the basic physico-chemical properties

viscosity enhancement

temperature resistance and viscoelasticity of the two polymers have been compared. The results show that after the introduction of temperature sensitive monomers

when the temperature is below 60 ℃

with the rise of temperature

the viscosity of AM-NaAA-RTM decreases; but when the temperature is above 60 ℃

its viscosity increases with the rise of temperature; while at 85 ℃

the viscosity of AM-NaAA-RTM is more than double that of AM-NaAA

which is conducive to expanding swept volume of high temperature reservoirs. In addition

the viscoelasticity modulus of AM-NaAA-RTM is higher than that of AM-NaAA. Therefore

the oil flooding effect of temperature-sensitive polymer is better than that of conventional AM-NaAA polymer

which is expected to be applied in chemical flooding of high temperature and high salt reservoirs.