Gas Control of Single Low Permeability Coal Seam Based on High-pressure Jet Slotting Technology

In order to solve the gas contral problem of single low permeability coal seam, single low permeability coal seam gas control technology system based 0 n high-pressure jet slotting was constructed.Permeability addition mechanisms and conditions of different high pressure jet slotting mode was analyzed.Reasonable hei ght, depth and coal output of slotted was determined.And networking arrangement of holes which can eradicate island effect was proposed.The technologies of slotted and pre-pumping gas in roadway strips, stoping area and crosscut region were applied in field.The results showed that gas drainage influence radius of single hole incr eased 2.0 ~ 4.3 times and the number of holes decreased by 36% ~ 44%.The effects of gas control was significant.