Hysteretic bit/rock interaction model to analyze the torsional dynamics of a drill string

Real, FF, Batou, A, Ritto, TG, Desceliers, C and Aguiar, RR (2018) Hysteretic bit/rock interaction model to analyze the torsional dynamics of a drill string. MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 111. pp. 222-233.

Text manuscript_for_liverpool_element.pdf - Author Accepted Manuscript Download (1MB)

Abstract

The present paper proposes a novel hysteretic (non-reversible) bit/rock interaction model for the torsional dynamics of a drill string. Non-reversible means that the torque-on-bit depends not only on the bit speed, but also on the bit acceleration, producing a type of hysteretic cycle. The continuous drill string system is discretized by means of the finite element method and a reduced-order model is constructed using the normal modes of the associated conservative system. The parameters of the proposed hysteretic bit/rock interaction model is fitted with field data. The non-linear torsional vibration and the stability map of the drill string system are analyzed employing the proposed bit/rock interaction model and also a commonly used reversible model (without hysteresis). It turns out that the hysteretic model affects the stability region of the system.

Item Type:	Article
Uncontrolled Keywords:	Drill string nonlinear dynamics, Bit/rock interaction model, Torsional vibrations, Stick-slip oscillations, Stability map, Hysteresis
Depositing User:	Symplectic Admin
Date Deposited:	19 Apr 2018 15:12
Last Modified:	19 Jan 2023 06:35
DOI:	10.1016/j.ymssp.2018.04.014
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020336