Numerical simulation of percussive drilling

Depouhon, Alexandre; Denoël, Vincent; Detournay, Emmanuel

doi:10.1002/nag.2344

Cited by 19 publications

(6 citation statements)

References 28 publications

(51 reference statements)

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“…In order to reduce the number of parameters in the expression, it is advantageous to reformulate the model in a dimensionless form by introducing scales. By nature, the percussive drilling process is characterized by multiple timescales [27]. Here in order to investigate the stress wave/energy transmission in one transmission cycle, the effective duration of the pulse generated by the impact of the hammer is selected as the time scale T * ; the hammer maximum movement following impact as the displacement scale U * ; the maximum impact force induced at the HBI as the force scale F * ; and the hammer impact velocity as the velocity scale V * .…”

Section: First Stage: Impact Between Hammer-bitmentioning

confidence: 99%

“…(26) back into Eq. (25) yields the equation governing the evolution of the force applied by the bit on the rock dft dτ + κ (λ + 1) ft = 2κf i , 0 ≤ τ ≤ τp (27)…”

Section: A2 Bit-rock Interfacementioning

confidence: 99%

“…Although the model is able to reproduce the optimal configurations observed in laboratory experiments, its direct applicability to percussive drilling is open to questions as it is framed in terms of rigid body dynamics rather than wave propagation and harmonic excitation is used to mimic percussive activation. Furthermore, an alternative drifting oscillator model based on a bilinear bit/rock interaction law and an impulsive rather than a harmonic loading could not reproduce an optimal configuration in the explored parametric range [27].…”

Section: Introductionmentioning

confidence: 98%

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Influence of Weight-on-Bit on Percussive Drilling Performance

et al. 2020

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A phenomenological model for percussive drilling systems is proposed in this paper to explain the experimentally demonstrated existence of an optimal weight-on-bit (WOB), for which the rate of penetration (ROP) is maximized. Several hypotheses have been previously proposed to explain this universal characteristic of percussive drilling, including increased wear of the bit, reduced indexing, and poor cleaning of debris under excessive WOB. Motivated by experimental evidence, we instead consider an increase of the pseudo-stiffness of the bit-rock interface (BRI) with increasing WOB, and investigate its effect on the impact energy transmitted to the rock. The 1D model approximates the dynamics underlying the drilling process by assuming that the impact of the hammer generates a longitudinal wave in the bit. It is shown that the BRI pseudo-stiffness influences the incident wave and associated energy transmitted from the bit to the rock. As a consequence, the drilling efficiency is affected by the dependence of the BRI stiffness on the WOB. The model indicates that there exist optimal conditions for the energy transfer from the bit to the rock in terms of the impedance ratio and the BRI stiffness/WOB. Thus it confirms that there is a sweet spot as seen in practice, which suggests that the root cause of the existence of a sweet spot in the ROP-WOB relationship lies in the nature of the BRI laws, rather than with issues related to bit indexing, bit wear, and/or cleaning of the debris.

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Section: First Stage: Impact Between Hammer-bitmentioning

confidence: 99%

“…(26) back into Eq. (25) yields the equation governing the evolution of the force applied by the bit on the rock dft dτ + κ (λ + 1) ft = 2κf i , 0 ≤ τ ≤ τp (27)…”

Section: A2 Bit-rock Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Influence of Weight-on-Bit on Percussive Drilling Performance

et al. 2020

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“…Bu et al [9,10] studied the phenomenon of the drill string's axial forced vibration with a periodic impacting force under DTH drilling in an innovative manner. Depouhon et al [11] presented a novel dynamical model to analyze the long-term response of the percussive drilling system. ey subsequently used a low-dimension model to study the process of percussive drilling [12].…”

Section: Introductionmentioning

confidence: 99%

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

Sun

et al. 2021

Shock and Vibration

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Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical difficulties of directional drilling. Nonlinear dynamic modeling developed by the authors was used to analyze the working principle and performance of the novel DTH hammer. The kinematics and dynamics simulation of this hammer were carried out using MATLAB language, and the motion law of the piston was revealed. The performance of the novel hammer was numerically simulated and evaluated by considering fluctuations of the front and rear chamber pressure, impact energy, acceleration, and frequency. The results show that our novel DTH hammer’s working principle is feasible and has an adequate structural design. The simulation results demonstrate reasonable design parameters. Compared to the numerical results for conventional DTH hammers, the velocity and acceleration of the piston of the novel hammer changed smoothly. The frequency was slightly higher than that of conventional hammers, while other parameters were nearly equal. The novel DTH hammer can be used in directional drilling, trenchless drilling, and seabed sampling drilling.

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“…It is fourth-order accurate when used in its conservative setting; the accuracy drops to third order when numerical damping is present, however. This makes it an ideal candidate for structural dynamics simulations [4] or, even, wave propagation ones in combination with the finite element method [5], as the numerical dissipation enables the control of high-frequency Gibbs oscillations.…”

Section: Introductionmentioning

confidence: 99%

De3: Yet Another High-Order Integration Scheme for Linear Structural Dynamics

Depouhon¹,

Detournay²,

Denoël³

2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. In this paper, we present the DE 3 integration scheme. This unconditionally stable scheme is dedicated to the numerical integration of linear structural dynamics problems and offers a simple and easy to use high-order alternative to the second-order accurate ones that are usually employed. Its symmetric formulation makes it an interesting candidate to simulate large-scale problems. In addition, the scheme offers the possibility to control the introduced numerical damping via a single algorithmic parameter, which is very convenient for the filtering of the spurious oscillations that can arise from large stiffness contrasts in certain models. The properties of high-order accuracy and numerical damping are illustrated by way of a demonstrative example. 1216A. Depouhon, E. Detournay and V. Denoël

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Numerical simulation of percussive drilling

Cited by 19 publications

References 28 publications

Influence of Weight-on-Bit on Percussive Drilling Performance

Influence of Weight-on-Bit on Percussive Drilling Performance

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

De3: Yet Another High-Order Integration Scheme for Linear Structural Dynamics

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