多层组装磁性聚合物复合微球调剖剂的制备及性能

摘要

The magnetic gel microspheres P(AA-AM-AN)/Fe3O4 were prepared by inverse emulsion polymerization and precipitation polymerization using iron oxide(Fe3O4), acrylamide(AM), acrylic acid (AA)and acrylonitrile(AN)as raw materials. The P(AA-AM-AN)/Fe3O4 were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR)and vibrating sample magnetometer(VSM). At the same time, The water-absorption performance of the magnetic profile control agents were studied under different preparation conditions and the profile control performance was discussed under simulated stratum environment condition. The experimental results show that the P(AA-AM-AN)/Fe3O4 magnetic composite microspheres were prepared,the microspheres have superparamagnetism, and can realize magnetic separation and recovery. The prepared microspheres have good transport properties due to the presence of hydrophobic polyacrylonitrile. The water-absorption performance of the magnetic gel microspheres is superior to others when the mass ratio of AN and P(AA-AM)/Fe3O4 is 1.25: 1, or rather, the water absorption rate is as high as 82.8 g/g. Besides,the water absorption rate of the magnetic gel microspheres was gradually increased with the increase of the water temperature of reservoir formation,and the decrease of NaCl content.%以四氧化三铁(Fe3O4)、丙烯酰胺(AM)、丙烯酸(AA)、丙烯腈(AN)为原料,采用反相乳液聚合法和沉淀聚合法制备核-壳结构的磁性凝胶微球调剖剂P(AA-AM-AN)/Fe3O4.利用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)和振动样品磁强计(VSM)对P(AA-AM-AN)/Fe3O4进行了表征,研究了不同制备条件下调剖剂的吸水溶胀性能,探讨了其在模拟地层环境条件下的堵水调剖性能.研究结果表明,制备的具有超顺磁性的P(AA-AM-AN)/Fe3O4复合微球可实现磁性分离回收处理.由于疏水性聚丙烯腈的存在,所制备的磁性微球调剖剂具有良好的运送特性.当m(AN):m(P(AA-AM)/Fe3O4)为1.25:1时,P(AA-AM-AN)/Fe3O4的吸水性能最优,吸水倍率高达82.8 g/g.另外,P(AA-AM-AN)/Fe3O4的吸水倍率随油藏地层水温度的增加而逐步增大,随NaCl含量的增加而逐渐降低.