Results 71 to 80 of about 168,341 (157)

Percussive-rotary Drilling Tool with Spring Accumulating Collision

Shiyou jixie, 2015
Percussive-rotary drilling technology is one of the effective ways to improve the drilling speed of deep and super-deep wells.Percussive-rotary drilling tool with spring accumulating collision is developed by combining a short positive displacement motor
Xuan Lingchao, Guan Zhichuan, Zhang Huizeng, Liu Yongwang   +3 more
doaj  

Study on Gas–Solid Particle Dynamics and Optimal Drilling Parameters in Reverse Circulation DTH Drilling Based on CFD and Machine Learning

Applied Sciences
The reverse circulation pneumatic down-the-hole (DTH) drilling system employs percussive drilling to achieve high efficiency and strong adaptability across diverse rock formations. However, its cutting removal efficiency remains suboptimal.
Kunkun Li, Jing Zhou, Peizhi Yu, Hao Wu, Tianhao Xu   +4 more
doaj   +1 more source

Development and application of MWD system for DTH drilling rig

Yantu gongcheng xuebao
The researches on the measurement while drilling (MWD) technology in the field of open-pit mining are still in the early stage, and the development of MWD systems is the primary task to realize the application of MWD technology in the mining engineering ...
HOU Shijun 1, DING Weijie 1, TIAN Shuaikang 1, LIANG Shufeng 1, LIU Dianshu 1, GUO Dachao 2
doaj   +1 more source

Experimental Study on Rock Breaking Effect of Axe-Shaped and Triangular-Ridged Cutters Under Impact Load

Shiyou jixie
In drilling engineering， optimized cutter selection for specific formations is critical to enhance rock breaking efficiency. To this end， a Split Hopkinson Pressure Bar （SHPB） apparatus was used to conduct impact-induced rock breaking tests of triangular-
Li Yunzhu, Liu Ronghe, Du Jianhong, Liu Bin, Wang Wenwen, XI Yan, Zhang Tianze   +6 more
doaj   +3 more sources

A review on condition monitoring and control of industrial drilling systems: fault detection, fuzzy control, and human-induced faults

Frontiers in Mechanical Engineering
This review presents a structured synthesis of recent advances in condition monitoring, fault diagnosis, and control of industrial drilling systems, with emphasis on rotary and rotary-percussive drilling.
Satyam Paul, Magnus Löfstrand
doaj   +1 more source

Numerical Simulation of Rock-Breaking Mechanism by Spherical Tooth Impact in Granite Formation

Applied Sciences
With the increasing depth of mining operations and the emergence of complex geological conditions, pneumatic down-the-hole (DTH) hammers have become an efficient drilling technology.
Jing Zhou, Kunkun Li, Hao Wu, Yuan Dong, Bairu Xia   +4 more
doaj   +1 more source

Proceedings of the Integrated Ocean Drilling Program 307: Modern Carbonate Mounds: Porcupine Drilling

, 2006
<p>Challenger Mound, a prominent mound structure covered with dead cold-water coral rubble on the southwest Irish continental margin, was the focus of 12 days of scientific drilling aboard the <em>JOIDES Resolution</em> during ...
Sasaki, Keiichi, Titschack, Jürgen, Foubert, Anneleen, Browning, Emily L., Gharib, Jamshid J., Frank, Tracy D., Bjerager, Morten, Andres, Miriam S., Li, Xianghui, Léonide, Philippe, Gaillot, Philippe, Abe, Kohei, Mangelsdorf, Kai, Huvenne, Veerle Ann Ida, Novosel, Ivana, Samarkin, Vladimir, Kano, Akihiro, Williams, Trevor, Fuwa, Yuji, De Mol, Ben, Spivack, Arthur J., Takashima, Chizura, Ferdelman, Timothy G., Cragg, Barry, Sakai, Saburo   +24 more
core   +1 more source

Parameter characteristics and rock-breaking mechanisms of horizontal drilling of underground collapsed bodies in coal mines

Meitian dizhi yu kantan
ObjectiveWith continuously increasing coal mining depth, the risks of hazards such as roof collapse and personnel entrapment caused by high in situ stress and mining-induced pressure have significantly intensified.
Ningping YAO, Xuqian DOU, Zhaoyang HAN, Guohua ZHANG, Yuchen SUN, Hao LI, Li WANG   +6 more
doaj   +1 more source

Testing of SLUSH ice penetrating probe in Europa, Enceladus, and Mars environments

Frontiers in Space Technologies
Europa and Enceladus conceal global liquid-water oceans beneath ice shells several kilometers thick, and Mars holds thick polar ice deposits that may cover localized layers of liquid water or brine.
Leo Stolov, Caleb Lang, Kris Zacny, Boleslaw Mellerowicz, Joseph Palmowski, Kathryn Bywaters, Frank Sheeran, Paul van Susante, Bethany L. Ehlmann   +8 more
doaj   +1 more source

Proceedings of the Integrated Ocean Drilling Program 346: Asian Monsoon

, 2015
<p>Integrated Ocean Drilling Program (IODP) Expedition 346 drilled seven sites covering a wide latitudinal range in the body of water bordered by the Eurasian continent, the Korean Peninsula, and the Japanese Islands, as well as two closely spaced ...
Irino, Tomohisa, Zheng, Hongbo, Lee, Gwangsoo, Holbourn, Ann E., Kubota, Yoshimi, Ikehara, Ken, Clemens, Steven C., Lopes, Cristina I.C.D., Gallagher, Stephen J., Anderson, Jr., William T., Sagawa, Takuya, Xuan, Chuang, Lofi, Johanna, Sugisaki, Saiko T., Kinsley, Christopher W., Saavedra Pellitero, Mariem, Henderson, Andrew C.G., Itaki, Takuya, Murray, Richard W., Giosan, Liviu, Wan, Shiming, Brace, Bobbi J., da Costa Gurgel, Marcio H., Toucanne, Samuel, Dunlea, Ann G., Karasuda, Akinori, Bassetti, Maria A., Singh, Raj K., Ziegler, Martin, Peterson, Larry C., Dickens, Gerald R., Tada, Ryuji, Alvarez Zarikian, Carlos A., Lee, Kyung Eun   +33 more
core   +1 more source