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 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 Balancing conservation and traditional use of yellow-spotted river turtle (Podocnemis unifilis) in Southern Rupununi, Guyana different RTS, two types of vibrations on the bit are found: stick-slip Metaverse in Human Behavior: The Role of Telepresence and Flow Experience on Consumers’ Shopping Behavior in the Metaverse 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 motion and the phase trajectories correspond to contracting spirals observed in the phase plane.