自聚集型聚合物微球调驱物理模拟实验

Laboratory Experimental Study of Self-aggregation Polymer Microspheres for Profile Control and Flooding

张子璐 曲国辉 支继强 贺伟中 刘义坤

ZHANG Zilu QU Guohui ZHI Jiqiang HEWeizhong LIU Yikun

高含水老油田目前主要采用聚合物微球深部调驱技术进行控水稳产，但效果并不理想，为了解决普通聚合 物微球与孔喉匹配性差、封堵能力有限的技术问题，本文研制了自聚集型聚合物微球NEPU-WMJ 与 NEPU-NMJ，通过高速冷冻离心机、光学显微镜对微球的物化性能进行评价，通过长填砂管驱替及双管并联法研 究了微球孔喉配伍性、剖面改善效果和驱油效果。研究结果表明：相较于NMKY、NM、WM与YHM微球，自聚 集型聚合物微球NEPU-WMJ 与NEPU-NMJ 的膨胀性能、长期稳定性能较好，在120 ℃下老化4～6 d 后， NEPU-WMJ 的平均粒径从2.57 μm 增至44 μm，NEPU-NMJ 的平均粒径从0.08 μm 增至89 μm；在120 ℃下 NEPU-WMJ可维持30 d 左右稳定，NEPU-NMJ则超过90 d 依然稳定。自聚集型聚合物微球在渗透率100×10-3～ 1000×10-3 μm2的岩心中均可实现深部运移，剖面改善能力强。在温度为95 ℃、渗透率级差为5 和40 的条件下， 有效提高总采收率24%以上。在高温环境下，微球的自聚集作用可有效封堵大孔道，启动低渗层，实现微观调 驱，大幅度提高采收率。

At present，polymer microsphere deep profile control and flooding technology is mainly used in high water cut old oilfields to control water and stabilize production，but the effect is not ideal. In order to solve the technical problems of poor matching between ordinary polymer microsphere and pore throat， and limited sealing ability， self-aggregation polymer microspheres NEPU-WMJ and NEPU-NMJ were developed. The physical and chemical properties of the microsphere were evaluated using a high-speed freezing centrifuge and an optical microscope. The compatibility of microspheres with pore throat， profile improvement effect，and oil displacement effect were studied through long sand filling tube displacement and dual tube parallel connection method. The research results indicated that compared to NMKY，NM，WM，and YHM microspheres，the self-aggregation polymer microspheres NEPU-WMJ and NEPU-NMJ exhibited better expansion and long-term stability. After aging at the temperature of 120 ℃ for 4—6 days，the average particle size of NEPU-WMJ increased from 2.57 μm to 44 μm，while the average particle size of NEPU-NMJ increased from 0.08 μm to 89 μm. NEPU-WMJ could maintain stable for about 30 days at the temperature of 120 ℃，while NEPU-NMJ could remain stable for more than 90 days. Self-aggregation polymer microspheres could achieve deep migration in the cores with the permeability of 100×10-3 —1000×10-3 μm2 with strong ability to improve profile. Under the conditions of temperature of 95 ℃ and permeability difference of 5 and 40，the total oil recovery rate was effectively enhanced by over 24%. In high-temperature environments，the self-aggregation of microspheres could effectively block large pores，activate low-permeability layers，achieve micro profile control and flooding，and significantly improve oil recovery.

10.19346/j.cnki.1000-4092.2023.03.009