Study of the influences of rotary table speed on stick-slip vibration of the drilling system

Study of the influences of rotary table speed on stick-slip vibration of the drilling system

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Stick-slip vibration presents one of the major causes of drilling problems, such as premature tool failures, low drilling efficiency and poor Revisiting residential self-selection issues: A life-oriented approach wellbore quality.The objective of this work is to investigate the influences of rotary table speed (RTS) on stick-slip phenomenon of the drilling system.In this study, the drilling system is treated as a lumped torsional pendulum model of which the bit/rock interaction is regarded as Coulomb friction.By analyzing cases with different RTS, two types of vibrations on the bit are found: stick-slip vibration and uniform motion.With an increase in the RTS, the stick-slip vibration on the drill bit disappears once the RTS arrives at its critical value.

For the cases that stick-slip vibrations occur, the phase trajectories converge toward a limit cycle.For the cases that stick-slip vibration does not appear, the drill bit tends to stabilize at a uniform Animal shelter management of feline leukemia virus and feline immunodeficiency virus infections in cats motion and the phase trajectories correspond to contracting spirals observed in the phase plane.