Study on gas outburst prevention technology with surface gas drainage for seam opening area in mine shaft

In order to ensure a safety seam opening in a new mine with the coal outburst and to improve the gas drainage and outburst elimination effect of the surf ace gas drainage well, a study was conducted on the selection of the gas drainage well, the gas drainage technique and technology, the gas drainage effect prediction and other aspects in Guanzhai Mine. The results showed that when the surface gas drainage was conducted in the complicated geological structure area, due to the fau It development and the unstable seam deposition, a horizontal gas drainage well was not suitably constructed and a vertical well and directional well would be pertinenc e and suitability. A perforation should be conducted within 20 m of the seam with outburst danger. A pumping bridge plug sectional fracturing was applied to the hydrauli C fracturing reconstruction. When the fracturing completed, seam combined drainage was applied to the reconstructed seam and the drainage effect was excellent. The engineering practices showed that the surface gas drainage well applied to the mine gas drainage could effectively reduce the danger of the coal and gas outburst and could ensure the safety construction in the mine shaft.