一种油田驱油用支化聚合物的合成及性能评价

Synthesis and Performance Evaluation of a Branched Polymer for Oil Displacement in Oil Fields

由于目前部分水解支化聚烯酞胺在实际应用于高温和高盐化度的油藏中时,很多聚合物溶液的增黏作用没有发挥出来,并且部分水解支化聚烯酞胺易被剪切降解,所以对部分水解支化聚烯酞胺进行修饰改性,在其中增加疏水单体和极性单体的方法来改善聚合物的耐温抗盐性来满足需求。本实验制备了一种驱油用聚合物,然后首先研究了初始温度对合成的聚合物相对分子质量的影响,接着研究了在聚合物当中导入极性单体以及疏水单体对聚合物在复合盐水溶液中表观黏度的影响,最后又进一步评价了聚合物的耐热性以及抗剪切性。结果表明:当疏水单体和极性单体的质量分数分别在0.55%、5%及初始温度在11℃左右时,该驱油聚合物具有非常好的热稳定性、增黏性与耐剪切性。

At present, when partially hydrolyzed branched polyenephthalamide is actually applied to high temperature and high salinity reservoirs, the viscosifying effect of many polymer solutions does not play out, and partially hydrolyzed branched polyenephthalamide is easy to be sheared and degraded, so partially hydrolyzed branched polyenephthalamide need be modified and optimized. In this experiment, a polymer for oil displacement was prepared.Then, the effect of initial temperature on the relative molecular weight of the synthesized polymer was studied. The effects of introducing polar monomer and hydrophobic monomer into the polymer on the apparent viscosity of the polymer in composite brine solution were studied. Finally, the heat resistance and shear resistance of the polymer were further evaluated. The experimental results showed that when the mass fractions of hydrophobic monomer and polar monomer were 0.55% and 5% respectively and the initial temperature was about 11 ℃, the hydrolytic branched oil displacement polymer had very good thermal stability, viscosity increasing and shear resistance.