Results 101 to 110 of about 1,261 (138)

Bifurcation and chaos in drillstring dynamics

Chaos, Solitons & Fractals, 1993
This paper contains an extensive discussion of the lateral vibrations of a stabilized drillstring as is used in drilling oil wells. The mathematical model leads to a system of two coupled second order ordinary differential equations with periodic forcing terms; using a rotating frame this system is turned into a four-dimensional autonomous system of ...
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On the dynamics of oilwell drillstrings with asynchronous motor drive

Proceedings of the 2015 16th International Carpathian Control Conference (ICCC), 2015
Recent work in stick-slip vibration quenching for drill pipes has been focused on models with distributed parameters where the drill pipe is assimilated to a rod. On the other hand it has been pointed out that the driving motor dynamics control may be helpful in reducing the breakdown/failures of the drilling devices. The present paper incorporates the
Eugen Bobasu, Daniela Danciu, Dan Popescu, Vladimir Rasvan   +3 more
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Development of Universal Application for Drillstring Dynamics Simulation

SPE Russian Oil and Gas Exploration & Production Technical Conference and Exhibition, 2014
Abstract One of the most topical problems of drilling mechanics is development of a software program for 3D string dynamic simulation in a 3D well on various operation regimes with maximum account of all external factors. The paper describes the results of long-term development of general-purpose DYNTUB software designed ...
V. S. Tikhonov, A. I. Safronov, Kh. R. Valiullin, O. S. Bukashkina   +3 more
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Measurement and Analysis of Drillstring Dynamics

2019
We shown that drilling dynamics is a crucial problem must be attached great importance to. Our innovation lies in combining actual measurement with theoretical modeling. Two evaluation methods are compared systematically, such as theoretical and measurement methods.
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A Multibody Dynamic Model of Drillstring for Torque and Drag Analysis

Journal of Offshore Mechanics and Arctic Engineering, 2015
Excessive torque and drag in the wellbore can result in the buckling and the failure of the drillstring. Accurate predicting torque and drag is important in drilling operations. Due to the nature of the drilling, determination of torque and drag is a dynamic problem.
Yang Caijin, Cheng Zaibin, Jang Wei, Jiang Shiquan, Ren Gexue   +4 more
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Dynamic Stability of Drillstrings Under Fluctuating Weight on Bit

SPE Drilling & Completion, 1993
Summary This paper describes the theory and the underlying formulation behind the development of a drillstring-dynamics simulator that predicts rapidly growing lateral vibrations triggered by axially induced bit excitations. The analyses center on calculations of stable rotary speed ranges for a given set of drillstring parameters and ...
V. A. Dunayevsky, Fereidoun Abbassian, Arnis Judzis   +2 more
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A deterministic approach to analyze the nonlinear dynamics of a horizontal drillstring

2013
Oil prospecting uses an equipment called drillstring to drill the soil until the reservoir level. This equipment is a long column under rotation, composed by a sequence of connected drill-pipes and auxiliary equipment. The dynamics of this columnn is very complex, because under normal operational conditions it is subjected to longitudinal, lateral and ...
Cunha Jr, A., Soize, Christian, Sampaio, R.   +2 more
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GEODYN: A Geological Formation/Drillstring Dynamics Computer Program

SPE Annual Technical Conference and Exhibition, 1984
ABSTRACT This paper describes the initial development phase of a finite element computer program, GEODYN, capable of simulating the three-dimensional transient dynamic response of a polycrystalline diamond compact (PDC) bit interacting with a non-uniform formation.
J.A. Baird, B.C. Caskey, M.A. Tinianow, C.M. Stone   +3 more
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Drillpipe-Dynamics Measurements - Insight Into Drillstring Dysfunctions

Journal of Petroleum Technology, 2012
This article, written by Senior Technology Editor Dennis Denney, contains highlights of paper SPE 145910, ’Drillpipe-Dynamics Measurements Provide Valuable Insight Into Drillstring Dysfunctions,’ by Constantijn Raap, SPE, Andrew D. Craig, SPE, and Ryan Graham, SPE, NOV, prepared for the 2011 SPE Annual Technical Conference and Exhibition, Denver, 30 ...
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Numerical Simulation of the Drillstring-in-Hole Dynamics at Rotary Drilling

Volume 2: Automotive Systems; Bioengineering and Biomedical Technology; Computational Mechanics; Controls; Dynamical Systems, 2008
A numerical solution is suggested for the problem of drillstring buckling under the action of compressive load, torque and drillstring rotation in a hole of an arbitrary axial line. This problem is of great practical importance when assessing the pass ability and wear of drillstring.
Vadim S. Tikhonov, Alexander I. Safronov
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