Long Borehole Gas Pre-pumping Applied Research On Thick Coal Seam Groups With Coal And Gas Outburst

In coal mine gas drainage methods, long bedding borehole gas drainage can not only improve the drainage volume and pumping efficiency but also reduce the cost of gas drainage, the bedding long borehole gas drainage technology is the development direction. But there are many difficulties in long bedding borehole drilling, and not yet make full use of its to solve the issue of coal mine gas. Now,solve the long-hole bedding construction issues need to be addressed urgently as a major technical problems.Thesis topics are from the national "Tenth Five-Year" key scientific and technological projects, "Coal Mine Disaster Management Technology Integration and Demonstration " one of the five demonstration projects, "Long-hole drilling technology and pre-pump gas technology research," in part of the study focus on solving long-hole in the bedding prominent thick coal seam gas drainage in the application, access to applied technology for future long bedding gas drainage drilling methods can learn from experience.Thesis combined with pelvic floor ore mining District # 15 on the south side and the epitaxial layer of a sub-surface the actual conditions in Nanshan of Hegang mine, First raised the improve program on the stability of combination drill and drill bits, At the same time, For drilling often crack and plugging holes problems on floor area in the Nanshan mine, made of bits of the secondary stabilizer to improve and the improvement of the program. Secondly, the use of ANSYS finite element software for the Nanshan mine floor area on the south side of a sub-layer of 15 # Lane back to the gas drainage the numerical simulation to determine the appropriate drainage effect Nanshan mine drainage drilling parameters, the impact of factors such as drainage time; again, in view of the above options and parameters in the Nanshan coal mine drilling floor area on the south side of a sub-layer of 15 # and extension of the south side set up a section of coal and North bis-shun long-hole drilling market and the market based on borehole drilling the actual measured flow data, long-hole effect of the drainage analyzed; Finally, the on-site experience of the experiment.