Study on New Extraction Technology and Effects of Coal Mine Gas

The papermainly deals with the current applied widely techniques at home: drilling techniquesand surface techniquesof gas drainage,the advantages and disadvantages of them are summarized andanalyzed. And based on these, some outstanding research results at home andabroad are introduced,the technologyof high pressure pulse water jet cutting in coal seam and oriented hydraulic fracturing,N2/CO2-ECBM technology, long directional drilling of large diameter technology, methanedegradation bacterium technology and so on are putforward.