The Simulation and Analysis of Drillstring Stick-slip Vibration

doi:10.11885/j.issn.1674-5086.2013.02.22.02

Abstract

Abstract:

In this paper，based on dynamical equation of the drillstring of four degrees of freedom and bit-rock interaction law，
we analyzed the dynamic characteristics of drillstring in straight borehole. And the systemic simulation software of a multi-DOF
drillstring stick-slip vibration is developed. Using this software，we made the simulation research on the influence of single
factor on the dynamic behavior of the drillstring. And we also derived the influence of the stiffness and the moment of inertia
of the drillstring，the bit and the rotary table，and WOB，speed，etc. on the dynamic behavior of the drillstring. In addition，
the four state characteristics of the movement of the drillstring are obtained. Further practical dynamic parameter simulation
of the drillstring，reveals that the longer the drillpipes are，or the shorter the drillcollars，the more likely the drillstring is in a
stick-slip vibration state. In addition，changing the inner and outer diameters of the drillstring is unlikely to effectively suppress
the stick-slip effect. Obviously，these results have very practical significance for on-site drilling process.

Key words: stick-slip, drillstring vibration, drillstring dynamics, torsional vibration model, simulation

Lü Miaorong, Shen Shigang. The Simulation and Analysis of Drillstring Stick-slip Vibration[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.02.22.02.

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