Results 41 to 50 of about 643,401 (321)

Design of an Intelligent Cascade Control Scheme Using a Hybrid Adaptive Neuro-Fuzzy PID Controller for the Suppression of Drill String Torsional Vibration

Applied Sciences
Eliminating the excessive stick–slip torsional vibrations of drill strings by utilizing an effective controller can significantly increase penetration rates and reduce drilling operation costs.
Abdelbaset Laib, Mohamed Gharib
semanticscholar   +1 more source

Research on Mechanism of Stick-Slip Vibration Induced by Friction between Drill String and Borehole Wall in Horizontal Well

Shiyou jixie, 2021
The stick-slip vibration of the horizontal well drill string system seriously threatens the safety of downhole drill strings and tools, reduces the drilling efficiency of the horizontal section, making the drill bit fail prematurely.
Zhu Jieran, Zou Deyong, Li Guangquan, Yang Ningning, Yang Quanjin, Lin Wei   +5 more
doaj  

Buckling and dynamic analysis of drill string system in horizontal wells

Nonlinear dynamics
Compared with vertical wells and deviated vertical wells, the dynamic characteristics of the drill string in horizontal wells are more complicated and more prone to failure because of the drag-pressure effect under gravity. Most researchers only consider
Zebing Wu, Wenxi Zhang, Ruofei Yuan, Jiale Liu   +3 more
semanticscholar   +1 more source

Drilling Parameters Optimization for Horizontal Wells Based on a Multiobjective Genetic Algorithm to Improve the Rate of Penetration and Reduce Drill String Drag

Applied Sciences, 2022
With the development of China’s oil and gas exploration and development to complex oil and gas fields, the drilling efficiency and safety of complex formations with large hardness and strong abrasiveness have become increasingly significant.
C. Zang, Zongyu Lu, S. Ye, Xinniu Xu, Chuanming Xi, Xianzhi Song, Yong Guo, Tao Pan   +7 more
semanticscholar   +1 more source

The Role of Chemistry Across Disciplines From Humanities to Life Sciences in Understanding Complexity and Emergence

Angewandte Chemie, EarlyView.
This study explores the origins of life by linking prebiotic chemistry, the emergence of information‐carrying molecules such as RNA and proteins, and philosophical questions about consciousness. The study emphasizes the role of molecular evolution in the Central Dogma and provides insights into the chemical origins of biology and the basis of life's ...
Harald Schwalbe, Josef Wachtveitl, Alexander Heckel, Florian Buhr, Sabrina Toews, Thomas M. Schimmer   +5 more
wiley   +2 more sources

Photocatalytic Cross‐Coupling of Phenols and Heteroaryl Halides With Machine Learning‐Guided Reaction Prediction

Angewandte Chemie, EarlyView.
Photocatalytic cross‐coupling: A redox‐neutral photochemical method enables direct C(sp2)─C(sp2) bond formation between phenols and heteroaryl halides using an organic dye and base. Complementary radical generation allows efficient cross‐coupling in up to 91% yield. Mechanistic studies, DFT, HTE, and machine learning rationalize and predict reactivity,
Matthew C. Carson, Alice Wu, Kalyana B. Duggal, Madeline E. Rotella, Marisa C. Kozlowski   +4 more
wiley   +2 more sources

Effect Of Drill String Rotation On The Dynamic Response Of Drilling Risers

International Journal of Applied Mechanics and Engineering, 2015
The effect of the rotation of a drill string on the response of a drilling riser has been studied. A governing equation for the flexural response that incorporates the effect of the drill string rotation is developed from first principles, and the ...
I.E. Major, A. Big-Alabo, S. Odi-Owei
doaj   +1 more source

Drill string dynamic characteristics simulation for the ultra-deep well drilling on the south margins of Junggar Basin

Petroleum, 2023
Improper drilling parameters may cause severe vibration of drill string which leads to reduce the rate of penetration and drilling tool premature failure accidents in the drilling process of ultra-deep well.
Yuan Li, Jianggang Shi, Minghu Nie, Chi Peng, Yingjie Wang   +4 more
doaj   +1 more source

Development of Technology for Hydromechanical Breakdown of Mud Plugs and Improvement of Well Cleaning by Controlled Buckling of the Drill String

Applied Sciences, 2022
The article provides brief information about a non-standard experimental setup developed in the laboratory of the St. Petersburg Mining University Well Drilling Department.
V. G. Kadochnikov, M. Dvoynikov
semanticscholar   +1 more source

Predicting remaining lifetime of drill pipes basing upon the fatigue crack kinetics within a pre-critical period [PDF]

, 2019
Purpose is to determine regularities of the development of corrosive fatigue cracks in terms of high-strength drill pipes. Methods. Basing upon the approaches of the material failure mechanics, the crack has been characterized by the area that is the ...
Moisyshyn, V, Tyrlych, V
core   +1 more source