Results 51 to 60 of about 5,423 (259)
Drilling fluid for drilling permafrost rocks
Bulletin of the Tomsk Polytechnic University Geo Assets EngineeringRelevance. The article provides an overview of the problem of drilling wells for oil and gas in conditions of permafrost. When constructing wells for various purposes in conditions of permafrost rocks, special requirements are imposed on the selection of the optimal drilling fluid.
Alexander Ya. Tretyak +2 more
openaire +2 more sources
Advanced Energy Materials, EarlyView.Boron‐oxide‐assisted particle engineering stabilizes O3‐type layered cathodes for sodium‐ion batteries by mitigating phase transitions and lattice strain. Acting as flux and structural modifier, boron forms submicron hexagonal platelets with (003) facets and expanded Na‐layer spacing, enabling rapid Na⁺ diffusion and mechanical resilience.
Tengfei Song +9 more
wiley +1 more source
Comparative Insights and Overlooked Factors of Interphase Chemistry in Alkali Metal‐Ion Batteries
Advanced Energy Materials, EarlyView.This review presents a comparative analysis of Li‐, Na‐, and K‐ion batteries, focusing on the critical role of electrode–electrolyte interphases. It especially highlights overlooked aspects such as SEI/CEI misconceptions, binder effects, and self‐discharge relevance, emphasizing the limitations of current understanding and offering strategies for ...
Changhee Lee +3 more
wiley +1 more source
FluidsThe flow occurring at the bottom of a polycrystalline diamond compact (PDC) drill bit involves a complex process made up of drilling fluid and the drilled rock cuttings.
Lihong Wei, Jaime Honra
doaj +1 more source
Breaking the Polarity–Coordination Coupling in Electrolyte Design for High‐Voltage Lithium Batteries
Advanced Energy Materials, EarlyView.Steric and electronic co‐regulation of 2,2,2‐trifluoro‐N, N‐dimethylethylamide (DMTFA) decouples high polarity from strong Li+ coordination, creating an anion‐mediated pseudo‐weakly solvating electrolyte. This design lowers Li+ desolvation barriers, enhances Li+ mobility, and builds B‐, F‐, and N‐rich inorganic interphases, enabling stable 3.0–4.6 V ...
Xue Li +9 more
wiley +1 more source
Integrated geo-ecological assessment of drill cuttings and approaches to their disposal
RUDN Journal of Ecology and Life SafetyThe study discusses the chemical properties of rock and drill cuttings. Drill cuttings have a negative impact on the components of the natural environment: soil cover, atmospheric air, groundwater. The purpose of the research was a comprehensive study of
Elena V. Gaevaya
doaj +1 more source
Известия высших учебных заведений: Геология и разведка, 2016 The paper considers the technological features of rock-destroying instruments (drill bits, drill crowns) of PDC series, concerning their vibration during drilling in rocks, variable in mechanical properties. A factor is presented, which characterizes the
M. S. Frolova
doaj +1 more source
Advanced Intelligent Discovery, EarlyView.Machine learning serves as a central engine for the intelligent characterization of two‐dimensional materials by integrating multimodal techniques, including optical microscopy, spectroscopy, electron microscopy, and scanning probe microscopy (SPM). This unified framework enables automated, high‐throughput, and quantitative extraction of structural ...
Zhi‐Long Cao, Jia‐Xu Yan
wiley +1 more source
Study on Mechanism of Stick–Slip Vibration Based on Torque Characteristics of PDC Bit
Applied SciencesStick–slip vibration (SV) of drill string systems is the main cause of fatigue failure of PDC bits under complex drilling conditions. Exploring its mechanism is helpful for identifying the causes of bit failure and developing preventive measures to ...
Lijun Li, Chunliang Zhang, Aixuan Wu
doaj +1 more source
Complex dynamics of drill-strings: Theory and experiments
MATEC Web of Conferences, 2018 We investigate complex drill-string dynamics in a downhole drilling where strong nonlinear interactions between various types of vibration take place.
Wiercigroch Marian +3 more
doaj +1 more source