Development and Application of Self-plugging on Both Ends Sealing Sack

In order to explore more simple and effective sealing technology, the self-plugging on both ends sealing sack which is used together with chemical materials is developed on the basis of the analysis of the routine sealing technology for gas drainage borehole. The sealing technology can realize fixed length and position of borehole pressurized sealing, and the sealing technology has better sealing effect, higher efficiency and lower labor intensity. The industrial test is carried out in Longshan Mine by using this technology. The results shows that the gas concentration decay of drainage borehole used by self-plugging on both ends sealing sack is slower, the borehole service cycle is longer, and the proportion of higher concentration borehole is higher.