Results 11 to 20 of about 504 (195)

Toolface Control Method for a Dynamic Point-the-Bit Rotary Steerable Drilling System

Energies, 2019
In the dynamic point-the-bit rotary steerable system (DPRSS), a high dynamic stiffness toolface control method is desired to ensure the stabilized platform traces the directional command accurately and quickly.
Weiliang Wang, Yanfeng Geng, Ning Wang, Xiaojiao Pu, Joice de Oliveira Fiaux   +4 more
doaj   +2 more sources

Compound disaster characteristics of rock burst and coal spontaneous combustion in island mining face: A case study

Case Studies in Thermal Engineering
The island mining face in coal mines often encounters stress concentration and significant air leakage, elevating the risk of rock burst and spontaneous combustion of residual coal in the goaf.
Xiaofei Liu, Xin Zhou, Zhenguo Zhang, Huajie Zhang, Zhoujie Gu, Siqing Zhang, Gaolei Yan   +6 more
doaj   +2 more sources

Position Deviation Control of Drilling Machine Using a Nonlinear Adaptive Backstepping Controller Based on a Disturbance Observer

, 2021
Thin coal seam mining is a development direction to solve the problem of energy supply at this stage, which cannot be realized by small working space, low automation, and drilling deviation.
Songyong Liu, Huifu Ji
core   +1 more source

The Development and Application of Novel Water-Based Drilling Fluid for Complex Pressure System Formation in the South China Sea

, 2023
The Y oilfield reservoir is characterized by ultra-depleted reservoir and multiple pressure systems in each well section. If conventional PLUS/KCL drilling fluid is used in directional drilling, the following problems are found: the rheological stability
Yi Huang, Zhiqin Liu, Miao Wang, Lifei Dong, Hexing Liu   +4 more
core   +1 more source

Design of an Intelligent Control System for Compound Directional Drilling in Underground Coal Mines

Journal of Advanced Computational Intelligence and Intelligent Informatics
The compound directional drilling process, including slip and rotation, is the key to realizing long-hole drilling in coal mines. First, a compound directional drilling process control scheme is proposed to realize intelligent control of the directional drilling process.
Wangnian Li, Min Wu 0002, Shipeng Chen, Lingfeng Mu, Chengda Lu, Luefeng Chen   +5 more
openaire   +1 more source

Use of Realistic Geomodels and Synthetic Ultra-Deep Directional Resistivity Inversion in the Pre-job Planning of a Horizontal Oil Production Well [PDF]

, 2016
The aim of this thesis is to test a workflow to improve subsurface understanding by building and updating realistic geomodels for a horizontal well in the Norwegian Continental Shelf (NCS).
Arora, Palak
core   +1 more source

Microstructure Modification of Additively Manufactured Mo–9Si–8B by Annealing and Its Effects on High‐Temperature Mechanical Properties

Advanced Engineering Materials, EarlyView.
Postbuild annealing systematically modifies the phase fractions and morphology of EB‐PBF processed Mo–9Si–8B. Quantitative microstructure–property correlations reveal how controlled phase evolution enhances high‐temperature compressive strength and creep resistance.
Christopher Schmidt, Yong Chen, Georg Hasemann, Benjamin Wahlmann, Carolin Körner, Manja Krüger   +5 more
wiley   +1 more source

Functionalizing Micro‐to‐Mesoscopic Electrode Architectures for Regulating Electron Transfer Behaviors in Electrocatalysis

Advanced Functional Materials, EarlyView.
A systematic review is conducted to assess the influence of electrode architecture across micro‐ to mesoscopic length scales on electron‐transfer pathways in electrocatalysis. We discuss the structure‐activity relationships in electrocatalytic applications, including resource recovery and environmental remediation, and provide cost‐effective, efficient
Manshu Zhao, Jiaojiao Zhang, Shideng Yuan, Xinmeng Yu, Keming Wan, Xiaoguang Duan, Zhining Wang   +6 more
wiley   +1 more source

Switching Prediction of Sliding and Rotating Modes in Compound Directional Drilling Based on Sliding Window

Journal of Advanced Computational Intelligence and Intelligent Informatics
Compound directional drilling consists of sliding and rotating modes. The two modes alternate to achieve trajectory extension, where the sliding mode achieves trajectory deviation and the rotating mode maintains the trajectory. When to switch between the two modes plays an important role in obtaining a satisfactory drilling trajectory.
Lijuan Fan, Chengda Lu, Hao Li, Wangnian Li, Hongchao Wei, Min Wu 0002   +5 more
openaire   +1 more source

Fiber‐reinforced Liquid Metal Composites With Automated Circuit Fabrication for Structurally‐Integrated Power Transfer

Advanced Functional Materials, EarlyView.
Fiber‐reinforced liquid metal composites (FibRe LMCs) are introduced that combine GPa‐scale structural performance with digitally programmable electrical conductivity. Through automated CNC activation, conductive pathways and wireless power transfer circuits are fabricated directly within load‐bearing composites, enabling structurally integrated ...
John Joyce, Charles K. Van Horn, Nathaniel J. Valentin, Angelica Phan, Michael D. Bartlett, Edward J. Barron III   +5 more
wiley   +1 more source