Results 1 to 10 of about 390 (88)
Directional drilling technology with mud pulse wireless MWD in underground coal mine
Meikuang Anquan, 2021 The directional drilling technology with mud pulse wireless MWD in coal mine was presented. We introduce the principle of the technology and analyze three key technologies: the wireless MWD with mud pulse, the compound directional drilling and the ...
LI Quanxin, CHU Zhiwei, XU Chao, FANG Jun
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Meikuang Anquan, 2021 Taking the actual drilling of multi-branch horizontal grouting wells in coal seam floor limestone layer of the Zhaogu No. 1 mine area as the research object.
LIU Xiugang, WANG Yi, LI Peng, SONG Yubo
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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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Meikuang Anquan, 2021 This paper takes the multi-branch horizontal grouting well reinforced with limestone on the corresponding floor L8 in the 15011 coal seam working face of Zhaogu No.1 Mine as the research object.
LIU Xiugang +3 more
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Application of mouth section hole forming technique for directional drilling in Yangquan Mining Area
Meikuang Anquan, 2021 In the construction of long borehole in coal mine, the construction of the start of directional drilling is not paid enough attention. Especially for the installation of the ultra-deep casing(≥100 m), the casing is often not in place due to the hole ...
SUN Haoda, TANG Shengli, LIU Xusan
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Meikuang Anquan, 2020 According to variation laws between borehole depth and orifice feed pressure found in consequent landslide directional drilling of hard limestone in Zhangji Coal Mine, back pressure phenomenon appeared at 400 m to 500 m hole depth.
DOU Xuqian, WANG Li, WANG Yi, XU Baolong
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Research on drag reduction technology for long boreholes drilling in coal mine
Gong-kuang zidonghua, 2020 In view of problem in long boreholes drilling in coal mine that frictional resistance between the drill string and the borehole wall seriously affects the transmission of weight-on-bit and hinders the further increase of the borehole depth, drag ...
WANG Siyi, ZHAO Jiangpeng, YANG Dongdong
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Development of ZDY15000LD High Power Directional Drilling Rig
Meikuang Anquan, 2020 To meet the needs of gas extraction, water damage prevention and detection of hidden disaster factors in the long working face of coal mine area with long distance and high efficiency, the high-power directional drilling equipment ZDY15000LD with 1 500 ...
ZHANG Rui
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Research of weight on bit transmission law of ultra-long directional borehole along coal seam
Gong-kuang zidonghua, 2019 In order to further increase directional borehole depth along coal seam and improve drilling efficiency of ultra-long directional borehole, influencing factors of weight on bit(WOB) transmission of ultra-long directional borehole along coal seam were ...
LIU Fei +4 more
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Gong-kuang zidonghua, 2018 For problems of shallow gas drainage hole depth, low control precision of drilling trajectory and poor gas drainage effect in soft—fragmentized coal seam of Qinglong Coal Mine, based on the analysis of mine gas geological conditions and existing pre ...
LI Quanxin +3 more
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