Results 211 to 220 of about 6,935 (243)
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Numerical Simulation of Drill-String Dynamics with an Initial Curvature
Applied Mechanics and Materials, 2015This work is devoted to modeling of nonlinear dynamics of the rotating drill-string taking into account initial curvature and finiteness of deformations. The drill-string is compressed by variable axial force. The case of flat bending of the drill-string with an initial curvature is studied, where drill-string considered as a one-dimensional rotating ...
Almaz Sergaliyev, Aliya Umbetkulova
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Validation of a drill string dynamical model and torsional stability
Meccanica, 2017This paper proposes a lumped parameter model for the torsional vibration of a drill string, with a nonlinear friction torque representing the bit-rock interaction. This model is sufficient to analyze torsional instability (stick-slip oscillations).
T. G. Ritto, R. R. Aguiar, S. Hbaieb
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A Multibody System Approach to Drill String Dynamics Modeling
Volume 4: Advanced Manufacturing Processes; Biomedical Engineering; Multiscale Mechanics of Biological Tissues; Sciences, Engineering and Education; Multiphysics; Emerging Technologies for Inspection and Reverse Engineering; Advanced Materials and Tribology, 2012The selection of optimal operational parameters for drilling oil and gas wells is a complex dynamic problem that depends on multiple parameters. Numerous physical and mechanical processes such as rock cutting, friction, hydraulics, and different modes of vibrations, occur during drilling, which should be accounted for in numerical models.
Dmitry Pogorelov +5 more
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Experimental Evaluations of Drill Bit and Drill String Dynamics
SPE Annual Technical Conference and Exhibition, 1994Abstract Laboratory and field experiments were performed to investigate the dynamics of the drill bit and drill string. Laboratory results for Anti-whirl and conventional polycrystalline diamond compact (PDC) bits showed that vibrations of the former were an order of magnitude less than those of the latter.
M. W. Dykstra +3 more
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Bit-Bounce and Stick-Slip in Drill-String Dynamics
2012A recently proposed two degrees-of-freedom model for axial and torsional vibrations of drill string elsewhere is here revisited. The model involves state-dependent time delay, with discontinuous cutting and friction force nonlinearities. The original model is, here, enhanced by introducing axial and torsional damping, and axial stiffness.
K. Nandakumar +2 more
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Dynamic drill-string modeling for acoustic telemetry
International Journal of Mechanical Sciences, 2022Hamid Mostaghimi +4 more
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Active Damping of Spatio-Temporal Dynamics of Drill-Strings
2005In the drilling process for the exploration of oil and gas resources a variety of vibration phenomena occur. Here, just self-excited torsional vibrations and forced flexural vibrations of the drill-string are considered. An experimental setup which models a real drill-string was designed and constructed.
Edwin Kreuzer, Henning Struck
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Dynamic Characteristic Response of Pdc Bit Vibration Coupled with Drill String Dynamics
Geoenergy Science and Engineering, 2023Liangjie Mao +4 more
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Component-Based Modeling and Simulation of Nonlinear Drill-String Dynamics
Journal of Offshore Mechanics and Arctic Engineering, 2022Christian Holden, Eilif Pedersen
exaly