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COBEM 2019
25th International Congress of Mechanical Engineering
Dynamic Analysis of a Drill-string with Lateral-Torsional Coupling
Submission Author:
Frederico Dias Souza , RJ , Brazil
Co-Authors:
Frederico Dias Souza, Thiago Ritto, Romulo Aguiar
Presenter: Lucas Passos Volpi
doi://10.26678/ABCM.COBEM2019.COB2019-0240
Abstract
Problems arising from vibrations while drilling represent a high cost to the oil industry, so it is indispensable the development of dynamic drilling models that can predict these vibrations. In this paper, we propose a simplified three degree of freedom dynamical model able to simulate the main phenomena related to oil well drilling. The model consists of a torsional pendulum coupled with a Jeffcott rotor. We analyzed different rotational speeds under three conditions: lateral formulation, lateral-torsional without stick-slip and lateral-torsional with stick-slip. From the results, it is possible to verify the operational conditions that lead to these vibrations, and also how these parameters influence time responses.
Keywords
Dynamical Analysis, drill-string, Well drilling, Forward Whirl, stick-slip
