Results 21 to 30 of about 285,909 (143)

Evaluation of deep geothermal exploration drillings in the crystalline basement of the Fennoscandian Shield Border Zone in south Sweden

Geothermal Energy, 2021
The 3.1- and 3.7-km-deep FFC-1 and DGE-1 geothermal explorations wells drilled into the Precambrian crystalline basement on the southern margin of the Fennoscandian Shield are evaluated regarding experiences from drilling, geological conditions, and ...
Jan-Erik Rosberg, Mikael Erlström
doaj   +1 more source

Influence of Mechanical Rotary Percussion Tool on Bit Feed Friction of Horizontal Well

Shiyou jixie, 2023
Weight-on-bit(WOB)congestion is one of the main factors restricting the penetration rate of sliding drilling in horizontal wells, and the use of vibration friction reduction tools is the most direct and effective way to reduce friction in horizontal ...
Yan Yan, Han Lihong, Song Zhilong, Liu Yonghong, Yang Shangyu, Wang Jianjun   +5 more
doaj  

Design and Application of a Rock Breaking Experimental Device With Rotary Percussion [PDF]

, 2016
The rotary impact drilling technology is one of the effective speed-up methods in drilling deep well. The dynamics model of the impact process and rock breaking shows that the peak value of the impact load is affected by the spring compression, and the ...
XUAN, Lingchao, GUAN, Zhichuan, LI, Jingjiao   +2 more
core   +1 more source

Analysis and Testing of Load Characteristics for Rotary-Percussive Drilling of Lunar Rock Simulant with a Lunar Regolith Coring Bit

Shock and Vibration, 2017
Based on an optimized lunar regolith coring bit (LRCB) configuration, the load characteristics of rotary-percussive drilling of lunar rock simulant in a laboratory environment are analyzed to determine the effects of the drilling parameters (the ...
Peng Li, Hui Zhang, Shengyuan Jiang, Weiwei Zhang   +3 more
doaj   +1 more source

Numerical Simulation Study on the Rock Breaking Effect of Multiple Axe-Shaped Cutters in Rotary Percussion Drilling

Shiyou jixie
The compatibility of percussion tools， PDC cutter types and hard rock formations is a key factor in extending the service life of percussion tools and drill bits and achieve the best rock breaking effect， but it has been rarely studied.
Leng Youheng, Wang Lixin, Chen Pengyu, Liu Ronghe, Xi Yan   +4 more
doaj   +3 more sources

Investigation of delamination mechanisms during a laser drilling on a cobalt-base superalloy [PDF]

, 2013
Temperatures in the high pressure chamber of aircraft engines are continuously increasing to improve the engine efficiency. As a result, constitutive materials such as cobalt and nickel-base superalloys need to be thermally protected.
SCHNEIDER, Matthieu, BERTHE, Laurent, FAVIER, Véronique, Favier, V., Schneider, M., GIRARDOT, Jeremie, Girardot, J., Girardot, Jérémy, Berthe, L.   +8 more
core   +1 more source

Structural Design and Test of Mechanical Rotary Percussion Drilling Tool

Shiyou jixie, 2020
Rotary percussion drilling technology can greatly increase the ROP of hard formations, but for plastic rocks, rock fragmentation is poor. For this reason, this paper proposes a technical plan for mechanical rotary percussion drilling tool prototype ...
Zhang Haiping
doaj  

Mercury cycling during the last glacial period in Arctic Lake El'gygytgyn, NE Russia

Journal of Quaternary Science, EarlyView.
ABSTRACT Tectonic processes play a key role in the global mercury (Hg) cycle on geological timescales, by mobilising Hg from deep Earth reservoirs to the surface. These natural fluxes also introduce a dynamic component to the terrestrial Hg cycle that can interact with other environmental signals and influence Hg delivery to sedimentary records.
Alice R. Paine, Joost Frieling, Bernd Wagner, Martin Melles, Volker Wennrich, Tamsin A. Mather, Stuart A. Robinson, David M. Pyle   +7 more
wiley   +1 more source

High-Speed Rotary Percussion Drilling Technology Optimization and Its Field Test in the Shunbei Block

Shiyou jixie, 2020
High-speed rotary percussive drilling technology is a new type of high-efficiency rock breaking technology based on PDM drilling and self-oscillating rotary percussive drilling.
Yu Yang, Liu Shiyin
doaj  

Induced drilling strains in glass fibre reinforced epoxy composites [PDF]

, 2013
Residual strains induced by drilling of glass-fibre reinforced polymers (GFRP) were determined using a hybrid experimental-numerical methodology. Experimentally, a set of GFRP specimens were drilled under well-defined tensile (calibration) stresses ...
STIFFEL, J.-H., Nobre, JP, VAN PAEPEGEM, W., Van Paepegem, WimTW118010012403440000-0003-0672-3675F574E142-F0ED-11E1-A9DE-61C894A0A6B4, BATISTA, Antonio, Nau, A, NOBRE, Joao Paulo, SCHOLTES, B., NOBRE, J.P., NAU, A., Scholtes, B, OUTEIRO, José, Stiffel, JH, Batista, AC, Outeiro, JC, Van Paepegem, Wim, MARTINS DO OUTEIRO, Jose Carlos   +16 more
core   +1 more source