| In recent years, gas explosion and outburst have happened frequently, how to effectively control the gas has become the key technical problems for China's government and coal enterprises to realize safe and reasonable and efficient exploitation. Among them, gas drainage is an effective way to solve gas outburst and explosion ,which has been recognized by the world, and is crucial to realize safety mining. Nowadays, coal enterprises have realized 600 ~ 1000 meter or even above 1000 meter ultra-long drilling depth with kilometer drilling equipment and measuring instruments gradually popularized and applied in China's coal mines, which has laid a solid foundation to dramatically increase summation and efficiency of gas drainage, and to significantly improve the result of gas drainage .Technique core of ultra-long drilling technique of gas drainage is Horizontal Directional drilling (HDD) in the coal mine. At present, application of the technology is still test stage, not mature. Test site is Si He coal mine of Jin Mei enterprise. Through data collection, field investigation, theory analysis and field test, the paper summarizes related theory and practice experience about Horizontal Directional drilling technology, drilling trace measurement technology, using equipment and apparatus, drilling parameters and drilling hole craft construction, and it comprehensively researches and analyses each link and factor of ultra-long drilling technique of gas drainage for various problems of its gas drainage. Meanwhile,the paper specifically elaborates field craft of ultra-long drilling technique of gas drainage, drilling parameters processing and drawing process of drilling trace, by the use of ZDY6000LD(A) kilometer drilling machine in north wing concentrated tunnel of east one panel of Si He coal mine of Jin Mei enterprise. According to the data, the paper objectively evaluates the result of gas drainage. It is also an effective solution to bad quality of drilling hole at Si He coal mine in the past. |
