静电强化成膜控砂剂分子设计、性能与作用机理

Molecular Design，Performance and Mechanism of Electrostatic Effect Enhanced Film-forming Sand Control Agent

宋金波 张川庭 贾培峰 梁伟 魏庆彩

SONG Jinbo ZHANG Chuanting JIA Peifeng LIANGWei WEI Qingcai

针对传统的化学固砂剂对地层渗透率伤害大以及聚合物类控砂剂吸附力弱、有效期短等问题，通过分子模 拟研究确定了控砂剂聚合物与二氧化硅之间的相互作用能。利用改性单体2，3-环氧丙基三甲基氯化铵制备了 季铵化改性聚酰胺控砂剂，在此基础上进行结构表征和性能测试。通过研究粒间结合力、砂粒表面的Zeta 电位 和覆膜砂粒的扫描电子显微镜图分析强化成膜控砂剂的作用机理。结果表明，季铵基团的引入增强了控砂剂聚 合物与二氧化硅之间的相互作用能。通过模拟井下控砂实验，确定季铵化的最佳反应接枝率为4%。冲刷流量 为7 L/h 时，砂柱出砂量仅为32 mg/L。静电强化成膜控砂剂现场应用效果显著，控砂施工后的产油量和产液量 大幅增加，原位稳定储层作用明显。

Aiming at the problems of complex great damage to formation permeability of traditional chemical sand consolidation agent，and weak adsorption capacity and short validity of polymer sand control agent，the interaction energy between the polymer of sand control agent and silica was determined through molecular simulation. Quaternary ammonium modified polyamide sand control agent was prepared by using modified monomer 2，3-epoxypropyl trimethylammonium chloride. The structure characterization and performance test of product were completed. The sand control mechanism was determined by studying the intergranular adhesion，the Zeta potential of sand surface and the SEM image of coated sand. The results showed that the introduction of quaternary ammonium groups enhanced the interaction energy between sand control agent（polymer）and silica. Through the simulated downhole sand control experiment，it was determined that the optimum grafting rate of quaternization reaction was 4%. When the flow reached 7 L/h，the sand production was only 32 mg/L. The on-site application effect of electrostatic strengthening film forming sand control agent was significant. The oil and liquid production after sand control construction greatly increased， showing a significant effect on in-situ stabilization of the reservoir.

10.19346/j.cnki.1000-4092.2023.02.016