Results 41 to 50 of about 143,227 (288)

Numerical Simulation of Rotary Impact Rock-Breaking Process of a Full-Size Drill Bit

Shiyou jixie, 2023
As the key fundamental aspect of rotary impact drilling technology, the mechanism of rock breaking has not been well demonstrated, which limits the application of this technology.To illustrate the rotary impact rock-breaking process, the numerical ...
Yan Yan, Han Lihong, Liu Yonghong, Yang Shangyu, Cao Jing, Mou Yisheng   +5 more
doaj  

Ultrasonic-Assisted Rock-Breaking Technology and Oil and Gas Drilling Applications: A Review

Energies, 2022
High-efficiency rock-breaking is a problem that has long been studied in the oil- and gas-drilling industry. The successful use of ultrasonic technology in related fields has prompted us to study how to introduce ultrasonic technology into rock-breaking ...
Jinyu Feng, Tie Yan, Yang Cao, Shihui Sun   +3 more
doaj   +1 more source

The rock cutting simulation of heterogeneous granite using FDEM method

Petroleum
Many advanced rock breaking methods are emerged form improving the ROP in deep formation drilling in recent years, such as electric pulse rock breaking, ultrasonic rock breaking and hydraulic rock breaking.
Weiji Liu, Hongxing Deng, Xiaohua Zhu, Yanxin Lv, Yunxu Luo   +4 more
doaj   +1 more source

The rock breaking and ROP increase mechanisms for single-tooth torsional impact cutting using DEM

Petroleum Science, 2019
Torsional impact drilling is a new technology which has the advantages of high rock-breaking efficiency and a high rate of penetration (ROP). So far, there is no in-depth understanding of the rock-breaking mechanism for the ROP increase from torsional ...
Xiao-Hua Zhu, Yun-Xu Luo, Wei-ji Liu
doaj   +1 more source

Substantial bulk photovoltaic effect enhancement via nanolayering. [PDF]

, 2016
Spontaneous polarization and inversion symmetry breaking in ferroelectric materials lead to their use as photovoltaic devices. However, further advancement of their applications are hindered by the paucity of ways of reducing bandgaps and enhancing ...
Grinberg, Ilya, Rappe, Andrew M, Wang, Fenggong, Young, Steve M, Zheng, Fan   +4 more
core   +1 more source

Numerical Simulation Study on Characteristics of Tight Hard Sand Broken by Axe-shaped PDC Cutter

Shiyou jixie, 2021
The study on the specific rock breaking mechanism of axe-shaped PDC cutter in the existing literatures is relatively less, the rock breaking characteristic test data are mostly for field application data, and there is short of theoretical basis of tooth ...
Zhao Runqi, Chen Zhenliang, Shi Huaizhong, He Wenhao, Shi Xingxing, Chen Han   +5 more
doaj  

Study on rock breaking mechanism of PDC bit with rotating module [PDF]

Journal of Petroleum Science and Engineering, 2020
Abstract In view of the problems of low ROP, short bit life and high energy consumption of bits in deep and difficult formations. Basing on the 360°rotating teeth and disc PDC bit, a rotating modular PDC bit is proposed. The rock breaking efficiency of the bit is improved by “cross scraping” of the rotating module element (RME) and fixed cutting ...
Huang, K, Yang, Y, Liu, Y, Zhong, Y, Ren, H   +4 more
openaire   +2 more sources

Atomic‐Scale Light Coupling Control in Ultrathin Photonic Membranes

Advanced Functional Materials, EarlyView.
Ultrathin photonic nanomembranes provide atomic‐scale control over the coupling between incident light and high‐Q photonic modes, enabling angstrom‐level resonance tuning and strong field confinement. When integrated with TMD monolayers, they further yield enhanced light–matter interactions, offering a versatile platform for advancing quantum photonics,
Chih‐Zong Deng, Chun‐Hao Chiang, Sunhao Shi, Jui‐Han Fu, Yen‐Ju Wu, Kuniaki Konishi, Vincent Tung, Chun‐Wei Chen, Ya‐Lun Ho   +8 more
wiley   +1 more source

Forming peculiarities and manifestation of tectonic faults in soft rocks [PDF]

, 2012
Features of distribution of tectonic structures in soft rocks confirm the presence of horizontal tectonic forces in the formation of faults and are based on the manifestation of their morphological features.
Austgen, M., Berg, S., Kubart, T., Nyberg, T., Pflug, A., Schmidt, R.M., Siemers, M., Wuttig, M.   +7 more
core   +1 more source

Toward Stable Multivalent Metal Batteries: Understanding the Interfacial Chemistry for Magnesium and Calcium Metal Anodes

Advanced Functional Materials, EarlyView.
Interphase chemistry governs the stability of multivalent metal batteries. We summarize state‐of‐the‐art developments in calcium and magnesium metal batteries by focusing on the correlation among electrolytes, interphase layers, and the electrochemical performance of corresponding metal anodes.
Huijun Lin, Qi Meng, Juncai Long, Chuheng Cao, Zheng‐Long Xu   +4 more
wiley   +1 more source