不同粒径聚合物微球深部运移和封堵特性对比*

Comparative Study on Deep Migration and Plugging Characteristic of Polymer Microsphere with Different Particle Size

刘义刚 李先杰 代磊阳 朱玥珺 薛宝庆 刘进祥 张 楠 卢祥国 何 欣

LIU Yigang LI Xianjie DAI Leiyang ZHU Yuejun XUE Baoqing LIU Jinxiang ZHANG Nan LU Xiangguo HE Xin

为满足渤海油田深部液流转向技术需求，利用激光粒度仪、生物显微镜以及岩心驱替实验方法，研究了两 种不同粒径的聚合物微球在注入水和多孔介质中的膨胀性及在长岩心中的深部运移和封堵性能。结果表明，在 渤海Q油田模拟注入水中膨胀8 d后，微球A的粒径中值从0.59 μm增至2.21 μm，微球B的粒径中值从9.18 μm 增至31.40 μm，均表现出良好的缓膨效果；微球在多孔介质中缓膨7 d后，岩心注入压力显著增加，表现出同样良 好的缓膨效果。在注入过程中，绝大多数微球能进入油藏深部。两种微球在长为300 cm、渗透率为1000×10-3 μm2 的岩心上均表现出较好的传输运移性能。经过不同时间水化膨胀后，岩心封堵率均显著增加，水化7 d后微 球B和微球A的平均封堵率分别为55.65%和41.68%，且距离注入端越近封堵率越高。但由于部分微球粒径较 大，会在岩心端面滞留造成端面堵塞，导致注入压力损失超过40%。图8表4参23

In order to meet the technical requirement of deep liquid flow steering in Bohai oilfield，the expansibility of two kinds of polymer microspheres in injected water and porous media was studied，as well as the injection capacity and plugging performance in long rock core by means of laser particle sizer，biomicroscope and core displacement experiment. The results showed that after 8 days of slow expansion in simulated injected water，the average particle size of microsphere A increased from 0.59 μm to 2.21 μm and that of microsphere B increased from 9.18 μm to 31.40 μm. After 7 days of slow expansion in porous media，the injection pressure increased significantly，showing the same good slow expansion effect. The microsphere could enter into the deep part of reservoir during injection process. The two microspheres had good transport and migration performance on the core with long of 300 cm and permeability of 1000 × 10-3 μm2 . After different time of hydration and expansion，the plugging rate of core increased significantly. After 7 days，the average plugging rate of microsphere B and microsphere A was 55.65% and 41.68% respectively. The closer to injection end，the higher plugging rate was. However，some microspheres with large particle size would stay at the end face of the core，resulting in the end face clogging and injection pressure loss of more than 40%.

10.19346/j.cnki.1000-4092.2021.03.011