Results 21 to 30 of about 392 (235)
Study on long drilling long-distance fixed-point gas content measurement
Gong-kuang zidonghua, 2021 The sampling time of long drilling fixed-point gas content measurement is long. And it is unable to measure the gas content in coal seams accurately due to the absence of desorption on site. In order to solve the above problems, a method of using analogy
ZHANG Jianguo1 +3 more
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Auxiliary adding and transporting technology of directional drill pipes
Meikuang Anquan, 2022 For the problems of high labor intensity and poor safety of manual way to add and transport the directional drill pipes in underground coal mine, based on the large diameter directional drilling rig structure layout and drilling technology ...
CHEN Zeping
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Directional drilling technologies equipment and application for hard rock in underground coal mines
Meikuang Anquan, 2021 According to the problems existing in directional drilling of hard rock in coal mines, such as low drilling efficiency, easy bearing pressure in deep hole drilling and easy damage of drilling tools in hole, based on the analysis of the causes of the ...
DOU Xuqian, WANG Li
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Research on digital platform technology of directional drilling in coal mine
Meikuang Anquan, 2023 This paper analyzes the current research status of digital platforms for underground coal mine drilling in China from three aspects: digitization of measurement while drilling, digitization of drilling site environment monitoring, and digitization of ...
Qiang FAN +4 more
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Hole completion technology for high level directional long borehole in complex roof
Meikuang Anquan, 2023 Aiming at the problems existing in the construction of high directional drilling in Tingnan Coal Mine roof, such as stratum breakage in open hole section, mudstone shrinkage in directional hole section, low efficiency of two-stage reaming and easy ...
Changbao JING +4 more
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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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Design and Implementation of a Chain-Type Direct Push Drilling Rig for Contaminated Sites
International Journal of Environmental Research and Public Health, 2023 For sites where volatile organic compounds are present, the direct push method, in combination with other sensors for investigation, is a powerful method. The investigation process is an integrated drilling and sensing process, but the trajectory of the probe carrying the sensor is ambiguous.
Pinghe Sun +19 more
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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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Automated drilling algorithms implementation on a laboratory drilling rig [PDF]
Modeling, Identification and Control, 2020 Considering the state of art technology that exists today and the significant resources that are being invested into the technology of tomorrow, an idea of intelligent and fully automated machineries working on a drilling floor that is capable of ...
Erik Andreas Løken +2 more
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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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