首先对聚合物微球和聚合物性能进行了评价.其次,通过微孔膜过滤装置研究了微球、聚合物及复合体系(微球+聚合物)的运移与封堵性能;利用双并联岩心物理模拟驱替装置,开展上述体系调驱实验.研究结果表明,微球形貌为圆球状,分散性好,粒径为微米级.在较高的剪切速率下,微球体系的表观黏度与水的黏度接近,远小于相同质量浓度的聚合物体系.聚合物未能对微孔实现高效封堵,微球的封堵能力最强,复合体系其次.在较强非均质条件下,复合体系调驱效果最好,所对应的高、低渗岩心采收率分别提高20.86 %和36.89 %.复合体系中微球和聚合物具有较好的协同作用,由于聚合物的携带和润滑作用,使得微球在多孔介质中的滞留减少及运移性增强,更有利于实现深部调驱.此外,聚合物的流度控制和黏弹性驱油作用也能有效提高采收率.在较强非均质油藏条件下,可优先考虑微球/聚合物复合体系调驱技术.%Firstly, we evaluated the polymer microspheres and polymer properties, then, studied the migration and plugging proper?ties of the microspheres, polymer and compound system(microspheres+polymer)by microporous membrane filtration device, and implemented the profile control and oil displacement experiments about the systems above by the parallel cores physical simulation displacement apparatus. The results indicated that the polymer microspheres was spherical micron-grade particles with superior dispersibility, and its apparent viscosity, which was much less than that of polymer with the same mass concentration, is close to that of water under the relatively high shear rate. The polymer failed to plug the micropores effectively. The plugging ability of the microspheres was the strongest, followed by the compound system. Under the condition of the strong heterogeneity, the effects of the profile control and the oil displacement of the compound system attained the best and corresponding enhanced oil recovery for high and low permeable cores were respectively 20.86 % and 36.89 % . There was a synergistic effect between the microspheres and polymer for the compound system. That the amount of the microspheres captured and migration property reduced and intensified in the porous medium mainly due to the impact of carrying and lubrication of polymer. Additionally, the influence of mobility ratio control and viscoelastic oil displacement of polymer could effectively improve oil recovery. For the actual reservoirs with relatively strong heterogeneous conditions, it was essential to take the profile control and flooding technology of the microspheres/polymer compound system into account firstly.
展开▼
