Results 1 to 10 of about 1,297 (234)
Surface settlement induced by horizontal directional drilling
Underground Space, 2023 Horizontal directional drilling (HDD) is a widely used trenchless method for underground utility connections. The associated ground settlement triggered by HDD depends on the size, types, and surface texture of pipe, diameter of borehole, and soil ...
Asif Ahmed +3 more
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Mechanical Analysis of DS in Horizontal Directional Drilling
Applied Sciences, 2022 In recent years, trenchless horizontal directional drilling (HDD) technology has developed rapidly towards the direction of large pipe diameter and long span. During construction, the buckling deformation and large drag torque of the drillstring (DS) are
Hua Tong, Yongbo Shao
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Meikuang Anquan, 2023 The geological structure of the deep coal seam in Qinshui Basin is relatively complex, which poses a new challenge to the control of the directional landing site of the horizontal well and the control of the drilling trajectory of the horizontal section,
WANG Yuhong, SUN Tianyu, LI Peng
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Meikuang Anquan, 2022 Stick-slip vibration generally exists in the process of drilling and construction, and near-horizontal directional drilling in underground coal mines is no exception.
WANG Siyi
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The optimization algorithm for application in directional drilling trajectories of energy field
Energy Reports, 2022 Recently, the directional drilling technology (DDT) has been extensive used in many energy field such as coal geological exploration, gas drainage and artificial freezing engineering etc.
Shu-jie Liu +3 more
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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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Theoretical analysis and design of hydro-hammer with a jet actuator: An engineering application to improve the penetration rate of directional well drilling in hard rock formations. [PDF]
PLoS ONE, 2018 Rapid horizontal directional well drilling in hard or fractured formations requires efficient drilling technology. The penetration rate of conventional hard rock drilling technology in horizontal directional well excavations is relatively low, resulting ...
Jiang-Fu He +3 more
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Research on rotary geosteering drilling technology and equipment in underground coal mine
Meitan kexue jishu, 2022 In view of the limitations of directional drilling technology and equipment for underground gas drainage in coal mining areas, such as low degree of automation, low drilling ratio of target formation, slow drilling rate of rock formation, and small ...
Ke YAO +7 more
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Comprehensive Exploration and three-dimensional construction technology of water plug based on directional horizontal drilling caved column [PDF]
E3S Web of Conferences, 2021 The ordovician limestone water inrush accident occurred during the excavation of 8228 working face in Tashan Coal Mine, Tongmei Group. On the basis of comprehensive geophysical exploration above and below the well, in order to find out the development ...
Tian Gan
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Technical difficulties and innovation in the Jiangyin Yangtze River crossing project of 3300 m HDD
Natural Gas Industry B, 2014 The Jiangyin Yangtze River Crossing Project sets up a record with the length of horizontal directional drilling (HDD) of 3300 m in the world. Inevitably, many technical difficulties might exist in pilot hole docking, reaming torque, property requirement ...
Wu Yiquan +4 more
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