Results 11 to 20 of about 152 (101)
Meikuang Anquan, 2020 The large dip and broken soft low permeability coal seam in Ewirgol Mining Area in Xinjiang has the problems of low pre-drained gas concentration and fast attenuation, and the extraction effect is not ideal.
HUANG Xueman, BA Quanbin
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Meikuang Anquan, 2021 In order to solve the problem of “three zones” division of spontaneous combustion in goaf of fully mechanized coal face and design and optimization of nitrogen injection parameters under the condition of hard roof of crushing soft outburst coal seam ...
WANG Zhengshuai
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Meikuang Anquan, 2022 Aiming at the characteristics of poor cementation and broken seam in Wangpo Coal Mine, the pneumatic directional drilling test of soft-fragmentized coal seam with high-pressure nitrogen slag discharge was carried out.
SUN Yongxin +5 more
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Meikuang Anquan, 2022 In view of the characteristics of large coal dust production, fast flow rate and high gas content in the air directional drilling of broken soft coal seam, the dust removal device of negative pressure suction and classification purification was designed ...
CHU Zhiwei
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Gas extraction technology of staged fracturing with comb hole in soft seam floor
Meikuang Anquan, 2021 This paper has investigated 15# broken soft and low permeable coal seam in Yangquan Mining Area. In order to improve the gas drainage effect of the broken soft coal seams, features of the coal seam and its floor rock were analyzed. The staged fracturing
DU Tianlin, JIANG Zaibing, ZHANG Jian, SHU Jiansheng, LI Guihong, MOU Quanbin, JIA Lilong
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Application of double pipe directional drilling technology in 313 face of Qinan Mine
Meikuang Anquan, 2021 In view of the problems of large dip angle of coal seam and soft broken coal seam of 32# coal seam in the construction of long borehole along the coal seam in the 313 working face of Qinan Coal Mine, using double power head rig and auxiliary drilling ...
XU Rui, HONG Jianjun, ZHANG Jie
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Meikuang Anquan, 2022 In order to solve the problems of hydraulic fracturing fractures easy to close, uneven fracturing, poor fracturing effect and difficult gas drainage in broken soft coal seam, combinning with the current mature drilling technology, self-developed ...
DONG Runping +4 more
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Meikuang Anquan, 2021 In view of the difficulties in dust control and dust removal in the gas drainage borehole of soft broken coal seam in coal mine, a new technology of dust control by air pressure at orifice and dry dust removal by annular seam injection is proposed.
GONG Xiaobing
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Gong-kuang zidonghua, 2022 The deformation and failure mechanism of surrounding rock and the control measures under the condition of long-time high superimposed stress are the keys to gob-side entry retaining support technology in thick coal seam with soft bottom.
KANG Zhipeng +3 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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