Results 21 to 30 of about 3,418,514 (199)
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 +2 more
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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 +3 more
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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
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Drill-String Dynamics: Reduced-Order Models
, 2009 Research efforts are underway to model and study the dynamics of a drill string, and preliminary results are presented in this work. The dynamics of a drill string system has non-smooth characteristics. Moreover, the drill string system dynamics exhibits
Balakumar Balachandran +2 more
core +1 more source
EXPERIMENTAL AND NUMERICAL STUDIES OF DRILL-STRING DYNAMICS [PDF]
, 2011 A drill string is the transmission component of rotary drill-rig system used for mining petroleum and natural gas resources. The drill-string system is essentially a long slender structure whose length can be in kilometers. Additionally, the drill-string
Liao, Chien-Min
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Component-Based Modeling and Simulation of Nonlinear Drill-String Dynamics [PDF]
, 2019 In this paper, we present a dynamic model for a generic drill-string. The model is developed with the intention for component-based simulation with coupling to external subsystems.
Tengesdal, Njål Kjærnes +5 more
core +1 more source
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 +5 more
doaj +1 more source
Whirling dynamics of a drill-string with fluid–structure interaction [PDF]
, 2023 Fluid–structure interaction models for drill-string vibrations are often of reduced order. However, both the structure and the surrounding fluid are non-linear, which can lead to complex coupled dynamic.
Cayeux, Eric +2 more
core +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
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Advanced Functional Materials, EarlyView.Borophene is introduced as a programmable 2D bio‐interface that organizes DNA through dual boron–sulfur and nucleobase interactions. This molecular architecture enables efficient long‐range nanosurface energy transfer, establishing new design principles for functional nano–bio interfaces and amplification‐free optical biosensing.
Teresa Aditya +11 more
wiley +1 more source