Results 21 to 30 of about 22,977 (217)

Analysis on Casing Wear Induced by Drill String Whirling during Workover Drill Grinding

Shiyou jixie, 2021
When the drill string rotates in the wellbore, it will whirl, collide with and rub against casing inwall, resulting in casing wear and reducing wellbore safety.
Cao Yinping, Li Hao, WanZhiguo, Dou Yihua   +3 more
doaj  

Helical Buckling of Drill-Strings

MATEC Web of Conferences, 2018
This paper presents experimental and numerical investigations of the complex drill-string vibration, with particular attention to the helical buckling of drill-strings and its influence on the system dynamics.
Kapitaniak Marcin, Vaziri Vahid, Wiercigroch Marian   +2 more
doaj   +1 more source

A Model-Based Intelligent Adjustment Method of Toolface for Bent-Housing Motor

Applied Sciences, 2023
The traditional toolface adjustment of a bent-housing motor is time-consuming and laborious. For the goal of rapid and accurate toolface adjustment, this paper presents an intelligent toolface adjustment method based on the drill string dynamics model ...
Tiansheng Deng, Qian Li, Hu Yin, Hao Peng   +3 more
doaj   +1 more source

Combining Formation Seismic Velocities while Drilling and a PDE-ODE observer to improve the Drill-String Dynamics Estimation

American Control Conference, 2020
In this paper we consider the axial motion of a drill-string and the interaction of the drill-bit with the formation. We design an observer that estimates, in real time, the axial speed and force along the drill-string and at the drill-bit using only ...
J. Auriol, N. Kazemi, K. Innanen, R. Shor   +3 more
semanticscholar   +1 more source

On dynamic stability of drill strings in a supersonic gas flow

Вестник КазНУ. Серия математика, механика, информатика, 2018
In this work stability of the drill string nonlinear dynamics, complicated by the effect of an external axial load, initial curvature of the drill string, geometric nonlinearity and the influence of a supersonic gas flow as a circulating medium is ...
Askat K. Kudaibergenov, L. A. Khajiyeva
doaj   +1 more source

Eliminating Stick-Slip Vibrations in Drill-Strings with a Dual-Loop Control Strategy Optimised by the CRO-SL Algorithm

Mathematics, 2021
Friction-induced stick-slip vibrations are one of the major causes for down-hole drill-string failures. Consequently, several nonlinear models and control approaches have been proposed to solve this problem.
Jorge Pérez-Aracil, Carlos Camacho-Gómez, Emiliano Pereira, Vahid Vaziri, Sumeet S. Aphale, Sancho Salcedo-Sanz   +5 more
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, Kapitaniak Marcin, Vaziri Vahid, Nandakumar Krishnan   +3 more
doaj   +1 more source

Beyond Presumptions: Toward Mechanistic Clarity in Metal‐Free Carbon Catalysts for Electrochemical H2O2 Production via Data Science

Advanced Materials, EarlyView.
Metal‐free carbon catalysts enable the sustainable synthesis of hydrogen peroxide via two‐electron oxygen reduction; however, active site complexity continues to hinder reliable interpretation. This review critiques correlation‐based approaches and highlights the importance of orthogonal experimental designs, standardized catalyst passports ...
Dayu Zhu, Hsi‐wen Wu, Xiao Wang, Jie Zhang   +3 more
wiley   +1 more source

Investigation of drill string dynamics using probabilistic methods

Technology audit and production reserves
The object of research is a drill string. The work is directed to the study of the drill string dynamics and its influence on the rock, which is drilled using probabilistic methods.
Viktor Svitlytskyi, Sergii Iagodovskyi, I. Boshkova   +2 more
semanticscholar   +1 more source

Mitochondria and Neuromast Tagging With Fluorescent Gallium‐Triapine Analogues: In Cellulo MP FLIM and Zebrafish Live Imaging

Advanced Science, EarlyView.
Fluorescent BODIPY‐conjugated thiosemicarbazone ligands and their Ga(III), In(III), and Fe(III) complexes, inspired by Triapine, are developed as theranostic agents. Multiphoton FLIM and confocal microscopy in cancer cells and zebrafish reveal real‐time uptake, mitochondrial localisation, and whilst spectroscopic assays indicated preserved complex ...
Megan J. Green, Michael W. Jones, Merissa Saleem, Haobo Ge, Melita Tvardauskaite, Julia Dudzic, Fernando Cortezon‐Tamarit, Rory L. Arrowsmith, Charareh Pourzand, Gabriele Kociock‐Kohn, Nicholas H. Rees, Jonathan R. Dilworth, Stephen Faulkner, Stanley W. Botchway, David Gurevich, Sofia I. Pascu   +15 more
wiley   +1 more source