Parametric analysis of a dynamical model of the axial vibration of a vibration-assisted drilling tool, a vibro-impact sy
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T E C H N I C A L N OT E S
E. F. V. d’Almeida · R. R. Aguiar · T. G. Ritto
Parametric analysis of a dynamical model of the axial vibration of a vibration-assisted drilling tool, a vibro-impact system with multiple impacts
Received: 26 June 2020 / Accepted: 28 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The aim of this work is to analyze the axial nonlinear dynamics of a drilling tool. The force at four impact surfaces are analyzed. Then, a parametric analysis is performed to investigate the effect that some parameters have on the dynamic behavior of the axial nonlinear dynamics of a drilling tool. Furthermore, a measure is proposed to evaluate the efficiency of the process, and used for design modifications of the current vibro-impact system. The results reveal the possibility of 85% increase in the impact force transfer and 125% increase in the mud flow operating range, when compared with the original design. Keywords Vibration-assisted drilling · Nonlinear dynamics · Parametric analysis · Vibro-impact · Contact
1 Introduction A vibration-assisted drilling tool can be defined as a drilling system that combines the rotary motion with a percussive action. In the oil industry, several prototypes were developed to be used in field applications, such as the Andergauge Drilling Systems hammer [5,7,8,11,13]. Preliminary field test results with these vibrationassisted drilling tools have shown a significant improvement in the rate of penetration (ROP) when drilling hard-rock formations. Several authors have investigated the dynamic behavior of vibro-impact systems. Cao et al. [2] analysis revealed that the penetration efficiency depends on the ratio between the static force and the dynamic force. Peterka et al. [10] showed that the chaotic motion of the impact oscillator appears near segments of saddlenode stability boundaries of subharmonic motions with two different impacts per period. Franca and Weber [4] showed that the best operating condition for the static loading coincides with the region that exhibits periodic behavior, as reported by [9]. Aguiar and Weber [1] developed an experimental and numerical analysis procedure to validate the impact force behavior of a vibro-impact system. D’Almeida et al. [3] developed a lumped parameter vibro-impact model to describe the axial dynamics of a vibration-assisted drilling tool prototype. The results showed an overall good match between field data and model outputs. In this context, the objectives of the present work are to: (1) employ the mathematical model proposed by [3] to explore the analysis of the impact forces inside the tool, (2) perform a parametric E. F. V. d’Almeida · T. G. Ritto (B) Department of Mechanical Engineering, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil E-mail: [email protected] E. F. V. d’Almeida E-mail: [email protected] R. R. Aguiar Brazil Technology Integration Center, Schlumberger Oilfield Services, Rio de Janeiro, Brazil
E.F.V. d’Almeida et al.
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