针对瓦斯抽采钻孔密封浆液流动规律及其监测方法研究存在的问题，本课题拟通过实验研究（磁性粒子物理性质测试实验、纳米磁性粒子渗流相似材料模拟实验、密封浆液三维磁性成像实验）及数理分析相结合的方式，运用特斯拉计、粘度计、多因素分析软件等手段，获得磁性粒子的适合类型及其与密封基液最佳配合比。同时，开展纳米磁性粒子渗流相似材料模拟研究，借助于三维磁性成像系统、声发射测试系统、电子显微镜等设备，对胶结后的煤岩相似材料进行全尺度的监测，探寻多因素多水平下密封浆液与磁性粒子的溶散机制。自主搭建密封浆液三维磁性成像实验系统，利用图像处理、数理分析软件，建立密封浆液纳米磁性粒子强度重建算法模型，并求解模型内单元节点的磁性强度。在磁性成像监测、磁性强度重建算法分析的基础上，提出密封浆液流动轨迹磁性空间分布特征及其成像方法，实现对密封浆液流动轨迹的“磁性化”成像。尝试为瓦斯抽采封孔的设计与效果评价提供理论依据。

In this research, as an attempt to improve the existing problems of the flow trajectory and monitoring method of seal slurry for gas drainage borehole, the physical tests (including magnetic particles physical properties tests, similar material simulation test in magnetic nanoparticles seepage flow, three dimension magnetic imaging test in Seal slurry)，mathematical analysis are employed to carry out the above research. Using the Teslameter, Viscometer，multi-factor analysis software , the suitable types of magnetic particles and the mix ratio of sealing carrier liquid will be obtained. similar material simulation test in magnetic nanoparticles seepage flow will be started at the same time, the coal/rock similar materials will be full-scale scanned to discover the dispersion mechanism between seal slurry and magnetic particles under multi-factor and multi-level conditions. By using image processing and mathematical analysis software, a three dimension (3D) magnetic imaging system of seal slurry will be designed and built up independently, a reconstruction algorithm model in magnetic field strength will be established to solve the magnetic field strength of element nodes in the model. Eventually, a new monitoring and imaging method will be put forward to monitor the spatial distribution of magnetic strength of flow trajectory based on reconstruction algorithm and 3D magnetic imaging system, which will magnetize imaging the flow trajectory. It is expected that the research result could provide some theoretical guides for the design and evaluation of borehole sealing technique for gas drainage.