Abstract: In view of high permeability and serious water channeling in Bohai oilfield, a new type selfassembled particles profile control system was investigated. Laboratory plugging and oil displacement experiments were carried out with different injection modes. Static experiments showed that self-assembled particles had good properties of heat-resistance and salt-resistance, and it was applicable on the reservoir conditions of 65 ℃ and 35 000 mg/L. Plugging experiments showed that for sand-filled pipe which permeability was about 10 000×10^-3 μm² , after particles plugging with guanidine gum or polymer as suspension liquid, the permeability was dropped to about 3 000×10^-3 μm² and effective plugging rate was above 70%. Oil displacement experiments showed that for parallel sand-filled pipes which permeability was about 20 000×10^-3 ，4 000×10^-3 μm² , when water-flooding recovery was 27.34%～28.17%, the degree of extraction can be improved by 28.57%～38.76% after injecting 0.4 PV self-assembled particles displacement system, and it can be up to 55.91%～66.80% finally. It should be noted the injection mode with guanidine gum or polymer was better. Mechanism analysis revealed selfassembled particles displacement system had plugging functions such as filling, bridging and adhesion.

Key words: Self-assembled particles, Conformance control, Sand pack, Plugging rate, Enhanced oil recovery, Mechanism analysis

摘要： 针对渤海油田储层渗透率高、水驱窜流严重的问题,采用新型自组装颗粒调驱体系,进行室内封堵以及驱油实验研究,并对颗粒注入方式进行对比。静态实验表明,自组装颗粒具有良好的耐温耐盐性能,耐温100 ℃, 耐盐35 000 mg/L;封堵实验表明,对于渗透率为10 000×10^-3 μm² 左右的砂管模型,采用胍胶或聚合物溶液悬浮颗粒封堵后,砂管渗透率降至3000×10^-3 μm² 左右,砂管有效封堵率达70%;驱油实验表明,对于渗透率为20000× 10^-3 μm2 和4 000×10^-3 μm² 的并联砂管模型,在水驱采出程度为27.34%~28.17%的基础上,注入0.4PV 自组装颗粒调驱体系,其采出程度可提高28.57%~38.76%,最终达55.91%~66.80%,且采用胍胶或聚合物悬浮颗粒的注入方式效果较好。实验揭示了自组装颗粒的封堵机理主要是填充封堵、架桥封堵、黏接封堵。

关键词: 自组装颗粒, 调驱, 砂管模型, 封堵率, 提高采收率, 机理分析