为了改善聚丙烯酰胺在高温高盐油藏条件下溶液的增黏性能,常用的方法是在合成过程中引入缔合类和抗盐类单体,但随着单体合成技术的发展,出现了一些温敏型共聚物,目前对这类聚合物驱油性能的研究较少。为此选择了常规AM-NaAA二元共聚物和AM-NaAA-RTM温敏型三元共聚物,对比了两种聚合物的基本物化性能、增黏性、耐温性和黏弹性,结果表明,引入温敏型单体后,温度低于60 ℃时,AM-NaAA-RTM共聚物黏度随温度的增加仍然降低,但在温度高于60 ℃时,黏度随温度的增加逐渐提高,在85 ℃时,AM-NaAA-RTM共聚物的黏度相对AM-NaAA二元共聚物提高1倍以上,有利于高温油藏扩大波及体积,且AM-NaAA-RTM共聚物黏弹模量高于常规AM-NaAA聚合物,因此,温敏型聚合物驱油效果好于常规AM-NaAA聚合物,有望应用在高温高盐油藏化学驱中。

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.