Results 11 to 20 of about 875 (185)
Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String [PDF]
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
doaj +2 more sources
Nonlinear Model and Qualitative Analysis for Coupled Axial/Torsional Vibrations of Drill String [PDF]
Shock and Vibration, 2016 A nonlinear dynamics model and qualitative analysis are presented to study the key effective factors for coupled axial/torsional vibrations of a drill string, which is described as a simplified, equivalent, flexible shell under axial rotation.
Fushen Ren +4 more
doaj +2 more sources
Drill-string dynamics coupled with the drilling fluid dynamics [PDF]
, 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
core +4 more sources
Drill-string nonlinear dynamics accounting for the drilling fluid [PDF]
, 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
core +4 more sources
Bifurcation Diagram and Dynamic Response of a Drill String Applied in NGH Drilling [PDF]
Processes, 2022 Natural gas hydrate (NGH) is a kind of unique resource among hydrocarbon fuels. It is stable within its sedimentary hosts and will only convert to its constituent gas and water phases relatively quickly if reservoir pressure-temperature conditions are artificially disturbed.
Baojin Wang +3 more
openaire +2 more sources
Chaotic Vibration Analysis of the Bottom Rotating Drill String [PDF]
Shock and Vibration, 2014 Drill string vibration is a widely studied topic. This paper developed a real-time measurement system near the drilling bit and extracted the lateral vibration, longitudinal vibration time series of bottom rotating drill string.
Qilong Xue +3 more
doaj +4 more sources
Suppression of Drill-String Stick-Slip Vibration [PDF]
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 horizontal dynamics with uncertainty on the frictional force [PDF]
Journal of Sound and Vibration, 2013 Abstract This paper analyzes the dynamics of a horizontal drill-string. In this dynamics, the frictional forces between the column and the borehole are relevant and uncertain. A stochastic model is proposed for the frictional coefficient: a random field with exponential autocorrelation function.
Ritto, T. G. +3 more
openaire +4 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
openaire +4 more sources
A Novel Mesoscopic Drill Bit Model for Deep Drilling Applications
Modelling, 2023 This paper deals with the development of a novel mesoscopic model of polycrystalline diamond compact (PDC) drill bits that can be implemented in complex drill string models for simulations to analyse the influence of rock inhomogeneities or the impact of
Mohamed Ichaoui +2 more
doaj +1 more source