Design optimization of a coal seam annular air reverse circulation bit [PDF]
Energy Science & Engineering, 2023 Reverse circulation (RC) drilling technology enables the rapid acquisition of coal seam samples, which is crucial in accurately measuring gas content. In addition, the design of the drill bit plays a key role in RC sampling. In this study, the turbulence
Demin Chen +3 more
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Design and numerical analysis of a large‐diameter air reverse circulation drill bit for reverse circulation down‐the‐hole air hammer drilling [PDF]
Energy Science & Engineering, 2019 Reverse circulation down‐the‐hole (RC‐DTH) air hammer drilling is a fast and cost‐effective method for hard rock drilling. As the air RC drill bit is the heart for RC‐DTH air hammer drilling system to form the reverse circulation, a large‐diameter RC ...
Xinxin Zhang +3 more
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Orthogonal experimental research on the structural parameters of a novel drill bit used for ice core drilling with air reverse circulation [PDF]
Journal of Glaciology, 2019 A new type of ice core drill bit, designed with a vane swirler, was developed for ice core drilling with air reverse circulation. An orthogonal experimental design method was employed to investigate the effects of the swirler structure parameters on the ...
Pinlu Cao +4 more
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Insight into dust control performance of a reverse circulation drill bit using multiphase flow simulation [PDF]
Engineering Applications of Computational Fluid Mechanics, 2022 A feature of reverse circulation pneumatic down-the-hole (DTH) hammer drilling system is its ability to reduce the emission of respirable dust which is known to be harmful to drilling workers and equipment.
Xinxin Zhang +5 more
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Pressure drop characteristics of reverse circulation pneumatic cuttings removal during coal seam drilling. [PDF]
Sci Prog, 2020 To solve the problems that the borehole depth is shallow and the drilling efficiency is low during the gas drainage drilling in soft coal seam with current cuttings removal method, a new technology of reverse circulation pneumatic cuttings removal is ...
Han X, Song S, Li J.
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Geofluids, 2021 A reverse circulation Down-The-Hole (DTH) hammer drill bit in Casing-while-Drilling (CwD) processes is designed and applied to drilling under complicated formation.
Bo Qi +7 more
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CFD-DEM method is used to study the multi-phase coupling slag discharge flow field of gas-lift reverse circulation in drilling shaft sinking. [PDF]
Sci RepTo elucidate the distribution law of the multiphase coupling slag discharge flow field in gas-lift reverse circulation during drilling shaft sinking, a numerical analysis model of gas–liquid–solid multiphase coupling slag discharge was established by CFD–
Guo L +5 more
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Investigation of Cuttings Transport in a Reverse Circulation Drill Bit during Direction Drilling Using Two-Phase Flow Simulation. [PDF]
ACS OmegaEffective removal of cuttings from the central channel of the drill tool is critical for directional drilling using pneumatic down-the-hole hammers, yet the flow behavior of cuttings in reverse circulation drill bits remains unclear.
Cui G +5 more
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Energies, 2023 Down-the-hole (DTH) hammer drilling with reverse circulation is a novel, mobile, high-speed drilling system suitable for the specific requirements of mine rescue. This technology can be applied to shorten the rescue time during mine accidents.
Kun Bo +4 more
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Energy Science & Engineering, 2019 This paper instructs the working principle of the well washing device and its parameter optimization in practical applications. A fluent fluid engineering simulation software was used to establish the calculation model of the bottom flow field. The fluid
Chun Sheng Wang, Lei Zhang
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