Results 61 to 70 of about 252 (179)

3D Numerical Simulation and Experiment Validation of Dynamic Damage Characteristics of Anisotropic Shale for Percussive-Rotary Drilling with a Full-Scale PDC Bit

Energies, 2018
The lower rate of penetration (ROP) is one of the key technical difficulties during drilling of shale reservoirs. Percussive-rotary drilling (PRD) is crucial for increasing ROP.
Guangjian Dong, Ping Chen
doaj   +1 more source

Models for Solidification and Splashing in Laser Percussion Drilling

SIAM Journal on Applied Mathematics, 2002
Summary: This paper studies systems of partial differential equations modelling laser percussion drilling. The particular phenomenon considered in detail is the ejection of the thin layer of molten material. This thin layer is modelled as an inviscid flow between the fluid surface and fluid/solid interface, both of which are unknown moving boundaries ...
openaire   +3 more sources

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

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

Drilling technology in mining industry [PDF]

Acta Montanistica Slovaca, 2006
The fundamental problem in rock working is the breakage of fragments out of the face of a solid rock wall rock. Mechanically, this can be done only by forcing a tool into the rock surface, after the manner of an indenter is commonly used in the testing ...
Loafi Messaoud
doaj  

The Atacama Rover Astrobiology Drilling Studies (ARADS) Project. [PDF]

Astrobiology, 2023
Glass B, Bergman D, Parro V, Kobayashi L, Stoker C, Quinn R, Davila A, Willis P, Brinckerhoff W, Warren-Rhodes K, Wilhelm MB, Caceres L, DiRuggiero J, Zacny K, Moreno-Paz M, Dave A, Seitz S, Grubisic A, Castillo M, Bonaccorsi R.   +19 more
europepmc   +1 more source

Investigation of Axial–Torsional Vibration Characteristics and Vibration Mitigation Mechanism in Compound Percussive Drilling

Applied Sciences
Severe drill string vibrations, particularly stick–slip, significantly compromise drilling efficiency and tool longevity in deep hard formations. Compound percussive drilling (CPD) has emerged as a promising technique to mitigate these vibrations and ...
Wei Wang, Boyu Guo, Gonghui Liu, Chunqing Zha, Tian Chen, Jun Li   +5 more
doaj   +1 more source