Results 61 to 70 of about 5,798 (299)

Control unit of the directional drilling system

, 2009
Rotary steerable systems (RSS) permit downhole directional control whilst continuously drilling in rotary mode. Rotary-steerable systems possess clear advantages both technologically and economically.
Zheng Dianfeng, Yiyong, Yang, Yang Yiyong, Liu Baolin, Dianfeng, Zheng, Kai, Zheng, Baolin, Liu, Jian, Cui, Zheng Kai, Cui Jian   +9 more
core   +1 more source

Topology and Material Optimization in Ultra‐Soft Magneto‐Active Structures: Making Advantage of Residual Anisotropies

Advanced Materials, EarlyView.
Residual magnetization induces pronounced mechanical anisotropy in ultra‐soft magnetorheological elastomers, shaping deformation and actuation even without external magnetic fields. This study introduces a computational‐experimental framework integrating magneto‐mechanical coupling into topology optimization for designing soft magnetic actuators with ...
Carlos Perez‐Garcia, Rogelio Ortigosa, Jesús Martínez‐Frutos, Daniel Garcia‐Gonzalez   +3 more
wiley   +1 more source

Programmable 3D Photovoltaics via Mechanically Origami‐Coded Interlocked 3D Kirigami and Nano‐Root Anchored AgNWs–In–Ga Multiphasic Alloy Conductor

Advanced Materials, EarlyView.
Mechanically origami‐coded 3D kirigami photovoltaics convert a single extension–release cycle into deterministic self‐folding, reconfiguring planar solar cells into programmable 3D modules. Distinct coding strategies enable either ultrahigh stretchability (500% system strain) or ultrahigh initial effective areal coverage (225%).
Seok Joon Hwang, Jiwon Ryu, Byungsoo Kang, Injong Oh, Dae‐Hee Cho, YoungHoi Cho, Seung S. Lee, Dong Hoe Kim, Deokjae Choi, Gee Yeong Kim, Heesuk Jung, Taehee Kim, Hyeonggeun Yu, Seungjun Chung, Byoung Koun Min, Phillip Lee   +15 more
wiley   +1 more source

Modeling and Analysis of Directional Drilling Dynamics

, 2017
Directional drilling technology provides more flexibility in the selection of rig locations than conventional vertical drilling. It significantly increases drilling efficiency by avoiding undesirable rock formations.
Madhu Vadali, Dongmei Chen, Tianheng Feng   +2 more
core   +1 more source

Advances in Magnesium‐Based Thermoelectrics: A Critical Review

Advanced Materials, EarlyView.
Magnesium‐based thermoelectric materials have emerged as promising candidates for low‐to‐mid‐temperature energy conversion due to their abundance, low cost, and competitive performance. This review summarizes recent advances in Mg3X2, MgAgSb, and Mg2X systems, covering transport mechanisms, fabrication strategies, stability challenges, and device ...
Li‐Min Zhang, Li Zhang, Nan‐Hai Li, Yan‐Ling Yang, Xiao‐Lei Shi, Zhi‐Gang Chen   +5 more
wiley   +1 more source

Efficient Removal of Magnetic Contamination from Drilling Fluids – The Effect on Directional Drilling [PDF]

, 2020
Magnetic debris in a drilling fluid have a significant influence on the ability of the drilling fluid to maintain its function. Down hole logging can suffer from poor signal to noise ratios. Directional drilling in areas close to the magnetic North Pole,
Zachman, Nicholas, Ånesbug, Geir Olav, Poedjono, Benny, Saasen, Arild   +3 more
core   +1 more source

Ultrathin Li Metal Anodes: Quantitative Design Principles and Manufacturability Across Liquid and Solid‐State Batteries

Advanced Materials, EarlyView.
Ultrathin lithium metal anodes (≤15 µm) offer a promising route to high‐energy‐density batteries due to their high capacity and low potential. This review presents design principles for ultrathin Li, evaluates fabrication strategies, and discusses challenges in liquid and solid‐state cells.
Cheng Wang, Caoyu Wang, Shuixin Xia, Jodie A. Yuwono, Mingnan Li, Yanqiu Lyu, Ruizhi Zhang, Jun Wang, Jianfeng Mao, Zaiping Guo   +9 more
wiley   +1 more source

Horizontal Directional Drilling

, 2021
Horizontal directional drilling (HDD) is a trenchless construction process for drilling boreholes and installing pipe without disturbing the surface and area under which the pipeline is needed.
New Jersey. Department of Environmental Protection. Science Advisory Board. Water Quality & Quantity Standing Committee
core  

Progress and understanding on geology-drilling engineering-mechanics coupling mechanism of ultra-deep directional wells [PDF]

Youqicang pingjia yu kaifa
Deep and ultra-deep oil and gas exploration and development are key strategic areas in China's energy sector, with ultra-deep directional drilling serving as a crucial technology for accessing these resources.
CHENG Hai,ZHANG Yiqun,WANG Yin,LIU Chao
doaj   +3 more sources

Technology of Directional Drilling Accident Treatment by Reverse Wire Salvage in Underground Coal Mine

Meikuang Anquan, 2020
The common types and treatment methods of drilling accidents in directional drilling construction are described, and the principle, auxiliary salvage drilling tools, process methods and key points of reverse wire salvage technology are emphatically ...
LI Shuaishuai, ZHAO Jianguo, LIU Fei, CHU Zhiwei
doaj   +1 more source