Fe₃O₄纳米封堵剂的制备、表征及封堵性能

Preparation, Characteriazation and Plugging Properties of Fe₃O₄ Nanoparticles for Plugging Agent

岳秋地 武元鹏 吴 江 林元华 郭其鹏 付 艳 黄进军 李劭燚

YUE Qiu-Di WU Yuan-Peng* WU Jiang LIN Yuan-hua Guo Qipeng FU Yan HUANG Jin-Jun LI Shao-Yi

通过热分解法制备了Fe3O4纳米封堵剂，利用傅里叶转换红外光谱（FT-IR）仪、X-射线衍射（XRD）仪、透射电镜对所制备的Fe3O4纳米粒子进行了结构表征，考察了Fe3O4在不同盐度NaCl溶液中稳定性及超声时间对Fe3O4纳米粒子在不同盐度NaCl溶液中分散稳定性的影响，并进行了人造泥饼模拟封堵实验。实验结果表明，Fe3O4纳米封堵剂最佳反应温度为200℃，最佳反应时间为2 h。FT-IR分析表明聚乙二醇修饰在纳米粒子表面，XRD分析表明所制备的Fe3O4纳米粒子属于立方晶相，TEM分析表明所制备的Fe3O4纳米粒子粒径在9.5 nm左右。超声0.5 h后的所制备的Fe3O4纳米粒子的耐盐分散性能最好。人造泥饼模拟实验结果表明，加入100 mL 质量分数为3%的Fe3O4纳米粒子水分散液，3.5 MPa压力下，7200 s后的滤失量只有11.3 mL，说明该纳米封堵剂堵水效果显著，是一种性能优异的纳米封堵材料。

In this paper, Fe3O4 nanoparticles were prepared through thermal decomposition method, and the obtained Fe3O4 nanoparticles were characterized by FT-IR, XRD, and TEM. The dispersion stabilities of Fe3O4 nanoparticles in NaCl solution under ultrasonic were investigated, and their plugging properties were tested on artificial mud cake. The experimental results indicated that the optimized reactive temperature and reactive time were 200℃ and 2 h, respectively. FT-IR analysis showed that the Fe3O4 nanoparticles are coated by PEG. XRD analysis revealed that the Fe3O4 nanoparticles were in cubic phase. TEM analysis indicateed the diameter of the nanoparticle was about 9.5 nm. The dispersion stability of the Fe3O4 nanoparticles was good after ultrasonic treatment for 0.5 h. The artificial mud cake demonstrated that Fe3O4 nanoparticles possessed prominent property for inhibiting water.The filtration of 100 mL aqueous solution containing 3% nanoparticles after 7200 s was 11.3 mL under the pressure of 3.5 MPa.