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• W2011138943 abstract "In this paper, the stick-slip vibration in oilwell drillstring is studied. The drilling system is modelled as a lumped-parameter torsional pendulum and the interaction between the drill bit and the rock is treated as Coulomb friction. Equation of motion of the drill bit is established and the dynamic responses of the drill bit are obtained. A drilling system with the drillstring length 3000 m is analysed, in which the system parameters are selected by reference to the actual drilling situation. After the slip vibrations in the initial stage, final state of the drill bit is a stable stick-slip vibration of which the limit cycle is a closed loop. In order to find the stability of the limit cycle corresponds to the periodically stick-slip vibration, different initial conditions for the drill bit are studied. Results show that the drill bit will lead to a periodic motion and the phase trajectories ultimately converge to the same limit cycle corresponds to stable stick-slip vibration." @default.
• W2011138943 created "2016-06-24" @default.
• W2011138943 creator A5009241933 @default.
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• W2011138943 date "2015-03-01" @default.
• W2011138943 modified "2023-09-27" @default.
• W2011138943 title "On the formation of limit cycle of the friction-induced stick-slip vibration in oilwell drillstring" @default.
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• W2011138943 doi "https://doi.org/10.1016/j.petlm.2015.03.005" @default.
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