为研究聚合物表面活性剂(聚表剂)与聚合物增黏、抗盐和驱油能力差异大的原因,采用FT-IR谱、SEM电镜表征两者的分子结构和聚集形态,通过岩心物理模拟实验与核磁共振技术分析两者的注入性、传导性、液流转向和驱油能力。结果表明:聚表剂因存在网状聚集体结构,相同质量浓度(500~2 000 mg/L)的聚表剂黏度是聚合物的3~4倍;聚表剂对储层渗流剖面的改善程度可达79.3%,而聚合物仅为63.9%;在中高渗油藏中聚表剂驱最终采收率较聚合物驱提高6.36个百分点。研究成果对于聚表剂作为一种新型大幅度提高采收率驱油剂应用于高含水高采出程度的中高渗油藏具有理论指导意义。
In order to study the reasons for the great differences in viscosity, salt resistance and oil displacement efficiency between polymer surfactant and polymer, FT-IR spectrogram and scanning electron microscope (SEM) were used to characterize the molecular structure and aggregation morphology of polymer surfactant and polymer. The injectivity, conductivity, fluid diversion and oil displacement efficiency of polymer surfactant and polymer were analyzed by core physical simulation experiment and nuclear magnetic resonance technology. The results show that the viscosity of the polymer surfactant with the same mass concentration (500 to 2,000 mg/L) was 3 to 4 times that of the polymer due to the presence of a reticular aggregate structure; the improvement by the polymer surfactant to the reservoir seepage profile was up to 79.3%, while the improvement by the polymer was only 63.9%; in the medium-high permeable reservoirs, the final recovery present of the polymer displacement was 6.36 Percentages higher than that of the polymer displacement. This study plays an important theoretical guiding role in the application of polymer surfactant as a new displacement agent for greatly improving recovery efficiency in medium-high permeable reservoirs with high water cut and high recovery percent.
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