Abstract:

Boreholes along coal seam is one of the main technical method of the coal seam gas drainage. For boreholes along coal seam sealing process is complex, sealing time-consuming long, poor sealing quality, short effective drainage time and other issues, proposed new type sealing device with pressure sealing technology and device. Described the composition and sealing principle of the new type sealing device, and its sealing process. Field test shows that: New type sealing device operation is simple, fast, single-hole sealing operation less than 25min; Sealing 30 days, the average gas drainage concentration reached 33%, and 50 days later still more than 30%, three times the contrast boreholes concentration (polyurethane sealing, within 50 days an average concentration of 10.6%); The new sealing device and technology effectively improved seam gas control effect.

Key words: new type sealing device, boreholes along coal seam, drainage concentration