在分散有CoNiFe₂O₄磁性颗粒的壳聚糖溶液中，加入适量的戊二醛交联剂，制得内核为磁性CoNiFe₂O₄颗粒、外层包有壳聚糖的微米级磁性壳聚糖复合微球。用扫描电子显微镜、透射电子显微镜、红外光谱图、X射线衍射等方法对磁性壳聚糖微球的形态和组成特性进行分析。以CoNiFe₂O₄磁性壳聚糖作为驱油剂在油田进行驱油实验，结果表明，该驱油剂具有良好的驱油性能以及抗盐能力。

The magnetic chitosan composite microspheres with magnetic CoNiFe₂O₄ particles as core and chitosan as outer coating are prepared by adding moderate glutaraldehyde into the chitosan solution containing diversified CoNiFe₂O₄ magnetic particles. The SEM, TEM, IR and XRD are used to detect the morphology and composition characteristics of the prepared CoNiFe₂O₄ magnetic chitosan microspheres. Then the prepared CoNiFe₂O₄ magnetic chitosan microsphere are used as oil displacement agent in the test of oil displacement in Shengli Oilfield and the results show that it has good ability in oil displacement and salt resistance.