Results 1 to 10 of about 60 (55)
International Journal of Coal Science & TechnologyCombined with the advanced drilling of the central return air shaft in Kekegai Coal Mine, the distribution law of slag discharge flow field by drilling method and the influencing factors of slag discharge effect are studied.
Longhui Guo +7 more
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Scientific ReportsTo elucidate the distribution law of the multiphase coupling slag discharge flow field in gas-lift reverse circulation during drilling shaft sinking, a numerical analysis model of gas–liquid–solid multiphase coupling slag discharge was established by CFD–
Longhui Guo +5 more
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Meitan xuebaoAiming at the problems of gas lift reverse circulation shaft washing slag discharge and low drilling efficiency in the application of vertical shaft drilling method in the Jurassic strata coal mines in western China, taking ϕ4.2 m advanced drilling of ...
Hua CHENG +4 more
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Numerical Simulation Analysis Based on the Study of the Slag discharge Mechanism of the Triangular-shaped Drill Pipe [PDF]
E3S Web of Conferences, 2021 According to the characteristics of high efficiency and high hole forming rate of the triangular-shaped drill pipe in the process of drilling in soft outburst coal seam, the slag discharge model of annular gap between the triangular-shaped drill pipe and
Tang Dayong +5 more
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Frontiers in Earth Science, 2022 The Erlang Mountain Tunnel Management Office is located in Luding County, Sichuan Province, China. A long-term open-pit limestone mine is located on the rear mountain, 1 km from the west entrance of the Erlang Mountain Tunnel Management Office for the ...
Hao Wang +5 more
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Research on Optimization of Large Flow Hydraulic Punching Process in Zhaozhuang Mine
Geofluids, 2022 Taking hydraulic punching test of Zhaozhuang Mine as engineering background, by comparing the field application effects of different hydraulic punching processes, the relationship between coal moisture content around the borehole blockage and gas ...
Jiabao Zhang, Dingqi Li
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Environmental Effects of Volcanic Volatile Fluxes From Subaerial Large Igneous Provinces
Geophysical Monograph Series, Page 103-116., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Tamsin A. Mather, Anja Schmidt
wiley +1 more source
Meikuang Anquan, 2022 According to the shallow sampling depth, inaccurate measurement and control of sampling position, large gas loss and other disadvantages existed in the available sampling technology for measuring gas content in broken soft coal seam, a sampling ...
CHAI Jianlu
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Gong-kuang zidonghua, 2020 In view of problems of rotary drilling technology for soft-fragmentized coal seam, such as shallow borehole completed depth, uncontrollable borehole trajectory, low drilling efficiency and poor gas drainage effect, pneumatic directional drilling ...
KONG Qingjun, CHU Zhiwei
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A simulation and experimental study of bottomhole flow field in a large-diameter rescue borehole
Meitian dizhi yu kantanObjectiveIn mine rescue, reaming using a large-diameter down-the-hole (DTH) hammer faces is challenged by complex bottomhole flow fields and difficult slag discharge. This study aims to address these challenges. MethodsTo reveal the influence patterns of
Yan ZHAO +9 more
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