Research on high directional and long drilling technology for extracting pressure relief gas in slowly inclined coal bed
1 College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an Shaanxi 710054,China
2 Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an Shaanxi 710054,China
3 Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal Industry,Xi'an Shaanxi 710054,China
4 Shaanxi Changwu Tingnan Coal Co.,Xianyang Shaanxi 713600,China
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