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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。
The Fe3O4 nano-blocker was prepared by thermal decomposition. The prepared Fe3O4nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and transmission electron microscopy The effect of the stability of Fe3O4 in NaCl solution with different salinities and the ultrasonic time on the dispersion stability of Fe3O4 nanoparticles in NaCl solution with different salinities were studied. The simulated plugging experiment of artificial mud cake was carried out. The experimental results show that the optimum reaction temperature of Fe3O4 nano-blocker is 200 ℃ and the optimum reaction time is 2 h. FT-IR analysis showed that polyethylene glycol was modified on the surface of nanoparticles. The XRD results indicated that the prepared Fe3O4 nanoparticles belonged to the cubic phase. TEM analysis showed that the size of Fe3O4 nanoparticles was about 9.5 nm. The prepared Fe3O4 nanoparticle prepared by ultrasonic wave for 0.5 h had the best salt-tolerant dispersibility. The artificial mud cake simulation results show that the addition of 100 mL mass fraction of 3% Fe3O4 nanoparticles aqueous dispersion, 3.5 MPa pressure, 7200 s after the loss of only 11.3 mL, indicating that the nano-blocking agent blocking effect was significant , Is a high performance nano blocking material.