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DINAME2019
DINAME2019
Friction-Induced Vibrations in a Drill-String Experimental Set-Up
Submission Author:
Ingrid Pires Macedo Oliveira dos Santos , RJ
Co-Authors:
Ingrid Pires Macedo Oliveira dos Santos, Bruno Cesar Cayres, Hans Ingo Weber
Presenter: Ingrid Pires Macedo Oliveira dos Santos
doi://10.26678/ABCM.DINAME2019.DIN2019-0114
Abstract
Excessive drill-string vibration leads to loss of the drilling process effectiveness and premature damage to the equipment. Due to the drill-string slenderness, torsional vibration is present in most drilling routines, eventually reaching the stick-slip phenomenon. This torsional vibration results from the nonlinear interaction between drill-bits and rocks. Despite the complexity of the bit-rock interaction, the relationship between torque and bit velocity is often treated as dry friction in a slender system. This contribution utilizes experimental and numerical approaches to study dry friction. The experimental approach considers a, so called, drill string experimental set-up, that consists of actuating a slender torsional pendulum where the inertia is subjected to friction with specific particularities. We propose a friction model based on experimental data, and analyze the hysteretic characteristic observed. The experimental results are used to identify the proposed model parameters. Lastly, we compare experimental and numerical results.
Keywords
drill-string vibrations, stick-slip, dry friction, hysteretic cycle
