Results 1 to 10 of about 169 (114)
Energies, 2021 The rotary-percussion drilling method is a prospective way to decrease drilling costs. It is obvious, based on literature analyses and finished geothermal drilling, that the Lublin Basin can be perceived as the one where rotary-percussion drilling can be
Tomasz Śliwa +2 more
exaly +3 more sources
Static-Guided Endodontics for Complex Intracanal Obstructions and Zirconia Post Removal: Report on Three Cases. [PDF]
Clin Case RepABSTRACT A standardized static‐guided framework integrating CBCT and intraoral scanning provides predictable, minimally invasive management for diverse intracanal obstructions. This unified digital workflow ensures precise root canal localisation in severe obliteration and conservative retrieval of fractured fiber or ultra‐hard posterior zirconia posts
Wang X, Li X, Yi B.
europepmc +2 more sources
Mining, 2021 Drill bit failure is a prominent concern in the drilling process of any mine, as it can lead to increased mining costs. Over the years, the detection of drill bit failure has been based on the operator’s skills and experience, which are subjective and ...
Hisatoshi Toriya +2 more
exaly +3 more sources
Civil Engineering Dimension, 2023 A dam foundation structure is usually strengthened by grouting, which begins with grout hole drilling. This paper aims to examine a comparison between conventional rotary and rotary-percussion drilling techniques in a drilling case study of the Tugu ...
Dika Prasetyo , Setya Winarno
doaj +1 more source
Известия Томского политехнического университета: Инжиниринг георесурсов, 2020 The relevance of the research. Pilot wells for horizontal directional drilling can be attributed to slim holes that are widely used in mining, in particular, for detailed exploration and underground development of non-ferrous metal ores, for degassing ...
Lev A. Saruev +4 more
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EXPERIMENTAL STUDY OF ROCK DESTRUCTION BY ECCENTRIC IMPACT PULSES DURING ROTARY-PERCUSSION DRILLING
Известия Томского политехнического университета: Инжиниринг георесурсов, 2020 The relevance of the research is caused by the need to find the ways to increase the maximum depth of well drilling by the rotary-percussion method and its productivity.
Vyacheslav V. Neskoromnykh +1 more
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Challenges of rock drilling and opportunities from bio-boring
Biogeotechnics, 2023 Drilling plays a significant role in the history of human civilization. The exploration of greater depths, extreme environments, or hazardous areas calls for more energy-efficient and high levels of autonomous drilling technologies with reduced cost and ...
Yumeng Zhao, Sheng Dai
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Identification of Impact Frequency for Down-the-Hole Drills Using Motor Current Signature Analysis
Applied Sciences, 2023 In rotary-percussion drilling, the impact frequency is a crucial variable that is closely linked to operational factors that determine the efficacy of the drilling process, such as the rate of penetration, bit wear, and rock mass characteristics. Typical
Diego Brito +4 more
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Известия высших учебных заведений: Геология и разведка, 2019 Rotary percussion drilling with pneumatic hammers is a promising, high-performance method widely used in the practice of geological exploration, the performance of which is determined mainly by pressure and the amount of cleaning agent supplied by the ...
V. V. Neskoromnykh +2 more
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High Efficiency Drilling Methods for Through Beds Hole in Underground Coal Mine
Meikuang Anquan, 2020 Considering the drilling efficiency problem encountered by crossing holes in underground coal mine, the paper divided roof and floor rock stratum into three grades in order to facilitate the study of technology in underground coal mine: high hard rock (4≤
DOU Xuqian
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