Results 11 to 20 of about 6,935 (243)
Nonlinear Dynamics of Torsional Waves in a Drill-string Model with Spatial Extent [PDF]
Journal of Vibration and Control, 2010 In this paper we investigate the dynamics and bifurcations of an oil-well drill-string model that takes the form of a neutral delay differential equation. We consider the torsional mode of the drill-string and investigate the associated stick-slip motion.
Barton, DAW, Krauskopf, B, Wilson, RE
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Drill-string dynamics coupled with the drilling fluid dynamics
, 2009 A drill-string is a slender structure that turns and drills into the rock in search of oil. A numerical model is developed using the Timoshenko beam theory and approximated by means of the Finite Element Method. The aim this work is to investigate the influence of the drilling fluid in the dynamics of the drill-string.
Ritto, T.G. +2 more
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Analysis of Drill-String Nonlinear Dynamics Using the Lumped-Parameter Method
Symmetry, 2022 This work aims at studying the nonlinear dynamics of drill strings using the lumped-parameter method (LPM). The study is based on the good consistency of the results of the test problem where the model of the longitudinal vibrations of a horizontal drill string with a static compressive load at the left end is considered.
Lelya Khajiyeva +3 more
openaire +3 more sources
Whirling dynamics of a drill-string with fluid–structure interaction [PDF]
Geoenergy Science and Engineering, 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. In this paper, a coupled fluid–structure model is developed, where the flow is reduced to multiple cross-sections and solved with the lattice ...
L.P. Volpi, E. Cayeux, R.W. Time
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Suppression of Drill-String Stick-Slip Vibration
MATEC Web of Conferences, 2018 We investigate experimentally and numerically suppression of drill-string torsional vibration while drilling by using a sliding mode control. The experiments are conducted on the novel experimental drilling rig developed at the University of Aberdeen [1]
Vaziri Vahid +2 more
doaj +2 more sources
Drill-string nonlinear dynamics accounting for the drilling fluid
, 2009 The influence of the drilling fluid (or mud) on the drill-string dynamics is analyzed in this paper. Usually the presence of the fluid is not taken into account in the analysis of the nonlinear dynamics of a drill-string. The aim of this paper is to investigate how the fluid affects this dynamics using a simplified fluid-structure interaction model ...
Ritto, T.G. +2 more
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Sensing and computational frameworks for improving drill-string dynamics estimation [PDF]
, 2021 International audienceIn this paper, we consider the axial motion of a directional multi-sectional drill-string. The drillstring dynamics are represented by a distributed dynamical model (wave equations) coupled with an ordinary differential equation at ...
Auriol, Jean +2 more
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Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String
Shock and Vibration, 2021 Natural gas hydrate (NGH) is a kind of new type green energy source with giant reserves which has been thought of highly by energy explorers in the world.
Baojin Wang +3 more
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On physical models in V.I. Gulyayev's three papers on drill string whirling and torsional vibrations
Petroleum, 2020 This paper introduces physical models of drill string whirling and torsional vibrations and analyses the physical models in V.I. Gulyayev's three papers on drill string whirling and torsional vibrations: “V.I. Gulyayev, L.V.
Zifeng Li, Chaoyue Zhang, Guangming Song
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Stick–Slip Vibration Characteristics Study of the Drill String Based on PID Controller
Energies, 2023 In order to address the issue of drill string stick–slip vibration, which leads to drill bit wear and reduces the drilling velocity, we conducted a study on the characteristics of stick–slip vibration using a proportional-integral-derivative (PID ...
Baoyong Yan +3 more
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