Research Status and Development Direction of Plugging Technology for Gas Drainage Hole in Coal Mine

Improving the plugging quality of gas drainage holes in coal mine has important practical significance for ensuring the concentration of the drained gas and promoting the healthy and rapid development of coal－bed methane exploitation and utilization industry．In this paper，the air leakage causes of gas drainage holes in coal mine were analyzed and 4 types of air leakage were defined．The technical characteristics of gas drainage hole plugging by cementing slurry，bag or polyurethane injection，PD material，flexible paste and new modified cement were described，and their applicable conditions were analyzed．The problems and challenges faced by gas drainage hole plugging technology in coal mine were further pointed out and the future development direction was prospected．