Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
A COMPARISON BETWEEN MODELING STRATEGIES FOR THE TORSIONAL DYNAMICS OF DRILL-STRINGS USING LUMPED-PARAMETER MODELS
Submission Author:
Daniel de Moraes Lobo , RJ
Co-Authors:
Daniel de Moraes Lobo, Thiago Ritto, Felipe Massa
Presenter: Lucas Passos Volpi
doi://10.26678/ABCM.COBEM2019.COB2019-1882
Abstract
Drill-strings are slender tubular structures used in drilling operations. This structure is often subjected to severe vibrations that can cause even the complete failure of the structure. One of the most harmful vibrations is the torsional one. Many authors have proposed lumped parameter models to describe the torsional dynamics of drill-strings, but there is still a lack of investigations about the comparison between the modeling strategies proposed. These investigations usually focus on the bit-rock interaction but neglect the discretization and other subjects. The objective of this work is to investigate different discretization strategies and compare them in terms of the natural frequencies. Also, the advantages of using dimensionless equations are discussed. It is concluded that a better discretization of the drill-pipes is more helpful and the use of dimensionless quantities generate results less sensitive to changes in drill-string properties.
Keywords
drill-string, Lumped parameter model, stick-slip, torsional dynamics
