Results 21 to 30 of about 3,048 (244)

Magnetic Interference Correction Method for Dynamic Measurement of Steering Head and Its Application

Shiyou jixie
During the operation of the rotary steering system， the magnetic interference faced by the steering head when performing dynamic measurement tasks mainly comes from two aspects： one is the magnetic influence of the internal current fluctuation of the M30
Zhu Jinsong, Song Xiaojian, Yu Yanfei, Zhang Suosheng, Jiang Qihong, Zheng Bangxian, Chen Jingwang   +6 more
doaj   +1 more source

Design of drilling parameters monitoring system of directional drilling rig in coal mine tunnel

Gong-kuang zidonghua, 2019
In view of problems of deficiencies in real-time display and centralized storage of drilling parameters of full hydraulic directional drilling rig in coal mine tunnel, a drilling parameters monitoring system of directional drilling rig in coal mine ...
FANG Peng
doaj   +1 more source

Optimization and Analysis of Sensitive Areas for Look-Ahead Electromagnetic Logging-While-Drilling Based on Geometric Factors

Energies
Look-ahead electromagnetic (EM) logging-while-drilling (LWD) plays an indispensable role in the prediction of deep and ultra-deep reservoirs. Traditional electromagnetic logging-while-drilling (EMLWD) and ultra-deep EMLWD technologies exhibit certain ...
Guoyu Li, Zhenguan Wu, Xiaoqiao Liao, Xizhou Yue, Xiang Zhang, Tianlin Liu, Yunxin Zeng   +6 more
doaj   +1 more source

Research of weight on bit transmission law of ultra-long directional borehole along coal seam

Gong-kuang zidonghua, 2019
In order to further increase directional borehole depth along coal seam and improve drilling efficiency of ultra-long directional borehole, influencing factors of weight on bit(WOB) transmission of ultra-long directional borehole along coal seam were ...
LIU Fei, XU Chao, WANG Xian, JIANG Lei, BI Zhiqi   +4 more
doaj   +1 more source

Research on gas pre-drainage in coal roadway strips by combined ordinary drilling and directional drilling

Gong-kuang zidonghua, 2021
When single layered ordinary drilling or directional drilling are used in gaspre-drainage in coal roadway strips, the long boreholes easily deviate from the trajectory and the cost of directional drilling is high.
JI Pengfei, GUO Ying, ZHANG Lei, KONG Xiangguo, WANG Xu, ZHOU Yuxuan   +5 more
doaj   +1 more source

Theoretical analysis and design of hydro-hammer with a jet actuator: An engineering application to improve the penetration rate of directional well drilling in hard rock formations. [PDF]

PLoS ONE, 2018
Rapid horizontal directional well drilling in hard or fractured formations requires efficient drilling technology. The penetration rate of conventional hard rock drilling technology in horizontal directional well excavations is relatively low, resulting ...
Jiang-Fu He, Yun-Pei Liang, Li-Jia Li, Yong-Jiang Luo   +3 more
doaj   +1 more source

Semantic-Preserving Mesh Direct Drilling [PDF]

2010 Shape Modeling International Conference, 2010
Advances in modeling of discrete models have allowed the development of approaches for direct mesh modeling and modification. These tools mainly focus on modeling the visual appearance of the shape which is a key criterion for animation or surgical simulation.
R Lou, JP Pernot, P Veron, F Giannini, B Falcidieno, A Mikchevitch, R Marc   +6 more
openaire   +5 more sources

Universal Electronic‐Structure Relationship Governing Intrinsic Magnetic Properties in Permanent Magnets

Advanced Functional Materials, EarlyView.
Permanent magnets derive their extraordinary strength from deep, universal electronic‐structure principles that control magnetization, anisotropy, and intrinsic performance. This work uncovers those governing rules, examines modern modeling and AI‐driven discovery methods, identifies critical bottlenecks, and reveals electronic fingerprints shared ...
Prashant Singh
wiley   +1 more source

Technology of gas extraction by deep hole directional drilling in underground coal mine and its applicatio

Gong-kuang zidonghua, 2019
In order to solve problems of slow tunneling and tension of mine excavation replacement in test mine using traditional extraction technology, a scheme of using deep hole directional drilling with long directional drilling instead of conventional drilling
MA Xiaomin
doaj   +1 more source

Injectable Dual‐Network Hydrogel System for Osteochondral Repair Combining Immunomodulation, Mechanical Adaptability, and Enhanced Tissue Integration

Advanced Functional Materials, EarlyView.
A UV‐triggered injectable dual‐network hydrogel is reported as the first application of bletilla striata polysaccharide (BSP) in osteochondral repair. By integrating methacrylamide‐modified BSP and nitrobenzaldehyde‐functionalized hyaluronic acid, the system achieves immunomodulation, mechanical reinforcement, and dynamic tissue adhesion, thereby ...
Jiaming Cui, Feifei Zhou, Yuan Luo, Tao Ouyang, Huiwu Zhang, Songmiao Cheng, Qiang Li, Xu Jiang, Yingying Yu, Yicheng Wang, Hong Ming   +10 more
wiley   +1 more source