Results 131 to 140 of about 193,780 (356)

Underreamer mechanics [PDF]

, 2009
In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will ...
Barton, David, Coskun, Erhan, Hall, Cameron, Jones, Marvin, Lacey, Andrew, Lorenz, Maike, Maringer, Johannes, Please, Colin, Richardson, Giles   +8 more
core  

Halide‐Dependent Photoluminescence and Heavy‐Atom Effects in Low‐Melting Organic–Inorganic Manganese Halides

Advanced Functional Materials, EarlyView.
Two pyridinium‐based ionic liquid templated hybrid manganese halides, (C4Py)2[MnCl4] and (C4Py)2[MnBr4], display similar bulk structures but show significantly different photoluminescence behaviors due to the bromine heavy‐atom effect. Their stable local Mn environments remain intact even in the molten state, allowing applications such as luminescence ...
Biswajit Bhattacharyya, Christian Balischewski, Jiyong Kim, Tiago Duarte, Lianshe Fu, Rute A.S. Ferreira, Alkit Beqiraj, Iuliia Mikulska, Diego Gianolio, Eric Sperlich, Felix Stete, Wouter Koopman, Christina Günter, Katlen Brennenstuhl, Daniel Van Opdenbosch, Cordt Zollfrank, Armin Wedel, Beth J. Murray, Małgorzata Swadźba‐Kwaśny, Tillmann Klamroth, Michael U. Kumke, Verónica de Zea Bermudez, Andreas Taubert   +22 more
wiley   +1 more source

The different member equivalent circulating density prediction model and drilling parameter optimization under narrow density window

Frontiers in Earth Science
Wellbore stability is a key factor in ensuring safe and efficient drilling operations. The variation in Equivalent Circulating Density (ECD) has a significant impact on safety, economics, and drilling progress.
Wanchun Zhao, Wanchun Zhao, Zhipeng Yang, Tingting Wang, Yan Zhou, Wei Song, Jingrun Li, Peihong Zhai   +7 more
doaj   +1 more source

Determination of the Rate of Penetration by Robust Machine Learning Algorithms Based on Drilling Parameters. [PDF]

ACS Omega, 2023
Alavi Nezhad Khalil Abad SV, Hazbeh O, Rajabi M, Tabasi S, Lajmorak S, Ghorbani H, Radwan AE, Mudabbir M.   +7 more
europepmc   +1 more source

Determining Rheological Parameters of Generalized Yield-Power-Law Fluid Model [PDF]

, 2004
The principles of determining rheological parameters of drilling muds described by a generalized yield-power-law are presented in the paper. Functions between tangent stresses and shear rate are given.
Stryczek Stanislaw, Winiowski Rafa³
core  

Multi Response Optimization of Machining Parameters for Drilling of Aluminium 2219 Alloy Using Taguchi and Grey Relation Analysis

, 2020
Lokanath M et al. Lokanath M et al., TJPRC   +1 more
openalex   +1 more source

Single‐ and Dual‐Atom Configurations in Atomically Dispersed Catalysts for Lithium–Sulfur Batteries

Advanced Functional Materials, EarlyView.
Single‐atom and dual‐atom‐based atomically dispersed catalysts (ADCs) effectively address the shuttle effect and sluggish redox kinetics in Li–S batteries. With nearly 100% atomic utilization and tunable coordination environments, ADCs enhance LiPSs adsorption, lower conversion barriers, and accelerate sulfur redox reactions.
Haoyang Xu, Zhenfeng Li, Yue Fei, Ali Mohammadi, Ge Li   +4 more
wiley   +1 more source

Establishing a Model Precursor System: Over a Decade of Research on Carbon Dots from the Citric Acid‐Urea System

Advanced Functional Materials, EarlyView.
The citric acid/urea (CA‐Urea) precursor system offers a versatile, scalable route to carbon dots with tunable luminescence and multifunctionality. Mechanistic insights into precursor chemistry and reaction parameters have enabled doping, surface modification, and hybridization strategies, yielding CDs for luminescent devices, sensing, catalysis ...
Yupeng Liu, Zhiqi Cai, Xiangxin Sun, Hanyi Zhang, Yiming Hao, Jun Wu, Zekun Yan, Xue Wu, Yiqi Liang, Liming Wang, Songnan Qu   +10 more
wiley   +1 more source

Drilling Parameters Optimization Technology Status and Development Trend

Shiyou jixie, 2016
With the increasing complex conditions for offshore and underground exploitation,and the continuous development of drilling technology,tools,equipment and instrumentation technology,the corresponding monitoring while drilling technology and computer ...
Sha Linxiu
doaj  

Study on Optimization of Drilling Parameters for Laminated Composite Materials. [PDF]

Materials (Basel), 2023
Yu J, Chen T, Zhao Y.
europepmc   +1 more source