Construction technology and parameter calculation of air drilling with raise boring machine [PDF]
E3S Web of Conferences, 2021 Based on the characteristics of raise boring technology and air drilling technology, the construction equipment and process of raise boring with air as circulating medium are studied.
HAN Bo, JING Guo-ye, LI Ang, HAO Hao-jie
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Experimental research of ice cuttings transport by air while drilling of the snow-firn layer
Лëд и снег, 2023 The snow-firn layer of the glaciers of Antarctica and Greenland contains data on the composition of the atmosphere in the past, volcanic eruptions, forest fires, anthropogenic pollution, and many other unique information.
S. A. Ignatiev +4 more
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Selection and application of the minimum gas injection volume of air drilling with raise boring machine [PDF]
E3S Web of Conferences, 2021 Gas injection volume is the key parameter of air drilling with raise boring machine, and the determination of the minimum gas injection volume is one of the key technologies to improve the drilling speed and shorten the drilling period.
HAN Bo +3 more
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Increasing the efficiency of rocks distribution tools in air-assisted well drilling [PDF]
E3S Web of Conferences, 2023 One of the main ways to ensure the normal temperature regimes of the rock crushing tool is to cool the temperature of the cleaning compressed air delivered to the well, that is, to eliminate the heat spread in the rock crushing tool by transferring the ...
Mustafayev O.B., Sobirov Sh.B.
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Meikuang Anquan, 2023 In order to solve the problems of dust pollution, poor lubrication of screw motor and overtemperature in the hole during air directional drilling in broken soft coal seams, an intelligent multifunctional dust removal system was developed for the first ...
LI Kun, ZHANG Jie
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Mechanical drilling of glaciers with bottom-hole scavenging with compressed air
Лëд и снег, 2022 Forecasting of the Earth's climate change is important for many spheres of human activity but this cannot be successful without reliable paleoclimatic information, an important source of which is the ice core material obtained during drilling of glaciers.
A. V. Bolshunov +4 more
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Fabrication of Micro-Holes with High Aspect Ratios in Cf/SiC Composites Using Coaxial Waterjet-Assisted Nanosecond Laser Drilling [PDF]
MicromachinesIn the present study, the coaxial waterjet-assisted nanosecond laser drilling of micro-holes in Cf/SiC composites, coupled with nanosecond laser drilling in air for fabricating micro-holes with high aspect ratios, were investigated.
Chenhu Yuan +6 more
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Research on drilling process technology and parameter optimization in soft coal seam [PDF]
E3S Web of Conferences, 2021 Due to the low firmness coefficient of soft coal seam and the influence of formation pressure and in-situ stress, it is easy to cause hole collapse in bedding drilling, resulting in low hole forming rate and insufficient hole forming depth, so the ...
Wu Weizheng
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Numerical Simulation Study of a Swirling Drill Bit Used for Ice Core Drilling
Journal of Marine Science and Engineering, 2022 Due to its high mechanical penetration rate and lack of pollution of the environment, air reverse circulation drilling is considered to be a promising method for ice drilling.
Mengke Wang +4 more
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Large Diameter and Fast Plug-in Type Spiral Drill Pipe for Drilling Down Screen Pipe Without Lifting
Meikuang Anquan, 2020 The technology and advantages are introduced about drilling down screen pipe without lifting, and a kind of large-diameter plug-in type spiral drill pipe for the screen pipe without lifting is developed, then the field tests are carried out in ...
YANG Huwei
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