瓦斯抽采钻孔的封孔质量直接影响其抽采效率，为了有效保障瓦斯抽采钻孔的封孔质量，对瓦斯抽采钻孔封孔后可能存在的漏风裂隙及其可控性进行定性分析，并据此对其漏风路径形成的难易程度进行对比。结果表明：封孔后瓦斯抽采钻孔内部及外部可能存在的裂隙主要有巷道围岩松动圈裂隙、支护装置周边裂隙、煤层内部原生裂隙、钻孔周边裂隙、封孔材料裂隙及抽采管裂隙6种；相应地，瓦斯抽采钻孔可能产生的漏风路径主要有7种，其中最容易形成的漏风路径为巷道内空气→巷道围岩松动圈裂隙→钻孔周边裂隙→抽采钻孔→抽采管。基于此，结合现有瓦斯抽采钻孔封孔装置的不足及其现场应用实际条件，从切断漏风节点之间的联系、消除漏风节点进而阻断漏风路径的原理出发，提出了1种可回收及多次补封的新型钻孔封孔装置。

The sealing quality of gas extraction boreholes can directly affect the extraction efficiency. In order to effectively guarantee the sealing quality of gas extraction boreholes, the possible air leakage crack and its controllability after the sealing of gas extraction borehole are qualitatively analyzed, and the difficulty of forming the air leakage path is compared accordingly. The results show that there may be six types of cracks inside and outside the gas extraction boreholes after sealing, including loose circle cracks in the surrounding rock of the roadway, cracks around the support device, primary cracks inside the coal seam, cracks around the borehole, cracks in the sealing material, and cracks in the extraction pipe; correspondingly, there are seven kinds of leakage paths that may be generated by gas extraction boreholes, among which the most likely leakage path is air inside the roadway to loose circle cracks in the surrounding rock of the roadway to cracks around the borehole to extraction boreholes to extraction pipes. Based on this, combined with the shortcomings of the existing gas extraction borehole sealing device and the actual conditions of its field application, starting from the principle of cutting off the connection between the air leakage nodes, eliminating the air leakage nodes and blocking the air leakage path, a new type of drilling hole sealing device that can be recycled and re-sealed for many times is proposed.