强碱对聚合物分子线团尺寸、聚集态和渗流特性的影响

摘要

采用动态光散射、电镜扫描、黏度和岩心流动实验相结合的方法,研究了强碱质量分数及其添加顺序对三元复合体系中聚合物分子线团尺寸、分子聚集态和渗流特性的影响.结果表明:在聚合物和表面活性剂质量分数相同(近)情况下,随着强碱质量分数的增加,聚合物分子链细化、卷曲、断裂,分子线团尺寸减小,宏观视黏度降低；与先添加聚合物和表面活性剂后添加强碱所得的驱油剂相比,先添加强碱并过滤沉淀物后再加入聚合物和表面活性剂所得驱油剂,其聚合物分子链网络状结构较完整、分子链较粗、分子线团尺寸较大,体系黏度较大、阻力系数和残余阻力系数较小.进一步明确了强碱在三元复合驱提高采收率中的重要作用.%With the help of the combining method between dynamic light scattering, scanning electron microscope, viscosity and core flooding test, the influences of the mass fraction and its added sequence of strong alkali on the molecular clew-group dimension ( Dh) , molecular aggregate states and seepage characteristics of the polymer in ASP system are studied. The results show that under the conditions of the same ( similar) mass fraction of polymer and surfactant with the rise of the mass fraction of the strong base, the polymer molecular chains become slimmed, curled and even fractured, molecular clew-group dimension ( Dh) and macrospcopically apparent viscosity decrease; Comparing with the oil flooding agent obtained from adding polymer and surfactant first and then strong base, the network configuration of polymer molecular chains is more complete, molecular chains are much thicker and molecular clew-group dimension ( Dh) and system viscosity are pretty bigger, and furthermore the resistance factor and residual resistance factor are greatly reduced for the oil-flooding agent form adding strong alkali first and then filtering the sediment and finally commingling the polymer and surfactant. The important role of the strong base in ASP EOR are further proved.