Results 31 to 40 of about 5,798 (299)
EnergiesLook-ahead electromagnetic (EM) logging-while-drilling (LWD) plays an indispensable role in the prediction of deep and ultra-deep reservoirs. Traditional electromagnetic logging-while-drilling (EMLWD) and ultra-deep EMLWD technologies exhibit certain ...
Guoyu Li +6 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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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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High-temperature directional drilling turbodrill
, 1982 The development of a high-temperature turbodrill for directional drilling of geothermal wells in hard formations is summarized. The turbodrill may be used for straight-hole drilling but was especially designed for directional drilling. The turbodrill was
Rowley, J. C., Neudecker, J. W.
core +1 more source
Gong-kuang zidonghua, 2021 When single layered ordinary drilling or directional drilling are used in gaspre-drainage in coal roadway strips, the long boreholes easily deviate from the trajectory and the cost of directional drilling is high.
JI Pengfei +5 more
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A Dislocation Perspective on Strength and Toughness in Ceramics
Advanced Engineering Materials, EarlyView.Dislocations in ceramics enjoy a long but yet under‐appreciated history. The three research waves for dislocations in ceramics highlight the topic evolution over the last 90 years. This review focuses on the impact of dislocation on strength and toughness in ceramics.
Xufei Fang
wiley +1 more source
Machine Learning for Improved Directional Drilling
, 2018 Directional drilling is a complex process involving the remote control of tool alignment and force application to a very long drill string subject to variable external forces.
Zachary Stoecker-Sylvia +4 more
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Path optimization advisory and analytical tools for directional drilling [PDF]
, 2017 In directional drilling, well positioning and drilling instructions are planned based on human experiences and may require excessive computation and drilling times.
Zheng, Dandan
core +1 more source
Gong-kuang zidonghua, 2019 In order to solve problems of slow tunneling and tension of mine excavation replacement in test mine using traditional extraction technology, a scheme of using deep hole directional drilling with long directional drilling instead of conventional drilling
MA Xiaomin
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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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