Construction Technology of Ground Pumping Well for Gas Drainage in Stable Mining-affected Region of Songzao Coal Mine

In order to explore the gas extraction technology in mining-affected stable region, ground holes are completed to pump coal-bed methane in stable mining-affected region in Songzao Coal Mine for the first time. According to the drilling practice, the strata characteristics over stable mining-affected region are obtained, the drilling difficulties and corresponding measures are discussed, the reasons of drilling accidents are analyzed. At last, the drilling technique for stable mining-affected region in Songzao Coal Mine is formed, which provides the conference for further drilling operation in the district.