Arithmetic solution for the axial vibration of drill string coupling with a down-the-hole hammer in rock drilling

Bu, Changgen; Li, Xiaofeng; Sun, Long; Xia, Boru

doi:10.1177/1077546314560041

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…Meng et al solved the problem of reasonable deviation and improved drilling efficiency by using the KQC series of air hammers [12]. Bu et al analyzed the impact performance and the phenomenon of the drill string's axial forced vibration with a periodic impacting force using ANSYS software [13,14]. Depouhon et al presented a dynamical model that integrates the axial dynamics of elastic piton and drill bit and analyzed the percussive drilling system [15].…”

Section: Introductionmentioning

confidence: 99%

Design optimization and feasibility analysis of pneumatic DTH Hammer with self-rotation bit

Wang¹,

Bo²,

Chen³

et al. 2022

J. vibroeng.

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This paper presents a novel pneumatic Down-The-Hole (DTH) hammer with self-rotation bit used for rock drilling, and the mechanical structure and working principle are mainly covered. A unique mechanism with ratchet and pawl incorporated in pneumatic DTH hammer is proposed for percussion-rotation drilling to break rock. The drill bit can rotate while the drill pipe stays still because of the structure design and reduces the friction between the drill pipe and borehole. Firstly, the rationality of mechanical invention is verified via the finite-element software ANSYS and the numerical simulation of impact dynamics. Moreover, the energy transfer regulation is revealed in the impact process under differential final impact velocity, which can help practical experience in mechanical design. Finally, based on the experimental study on the novel hammer, we found that its function can satisfy the requirement, as well as overall performance, was improved.

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Section: Introductionmentioning

confidence: 99%

Design optimization and feasibility analysis of pneumatic DTH Hammer with self-rotation bit

Wang¹,

Bo²,

Chen³

et al. 2022

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…Ryu et al [8] developed a novel technique for micro-tunnel excavation using a multihammer drilling machine and identified the optimum operating conditions of the system. 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.…”

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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“…The problem of drillstring vibrations has been recognized for many years as one of the prime causes of deterioration in drilling performance, and was subjected to some investigations as reported in the literature (Khulief et al., 2008; Bu et al., 2014; Ghasemloonia et al., 2014; Kamel and Yigit, 2014; Zhu and Jing 2014; Ghasemloonia et al., 2015). Field observations based on downhole and surface vibration measurement have indicated that drillstring exhibits severe vibrations.…”

Section: Introductionmentioning

confidence: 99%

Lateral vibration analysis of pre-bent pendulum bottom hole assembly used in air drilling

Zhang

Wang

et al. 2018

Journal of Vibration and Control

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In the air drilling process, the pre-bent pendulum bottom hole assembly (PBP-BHA) has excellent performance in controlling the well deviation and improving the wellbore quality, but the mechanism that is closely related to the dynamics of the PBP-BHA has not been ascertained. In this paper, an effective technique combining the weighted residuals method with the finite element method is presented to study the PBP-BHA lateral vibration. First, a three-dimensional nonlinear static model of pre-bent BHA is established under small deformation condition and solved by the weighted residuals method and optimization method, so as to define the tangent point according to the deformation characteristics of the PBP-BHA. This tangent point determines the end of the effective PBP-BHA length that starts from the drill bit. Subsequently, the finite element model of PBP-BHA is established to solve the lateral natural frequencies and mode shapes of the PBP-BHA. After considering the borehole wall constraint, the modal superposition technique is used to obtain the steady dynamic responses of the PBP-BHA. Meanwhile, the dynamic performance of the PBP-BHA used in the actual air drilling process is calculated to obtain its critical speeds and working status chart. The critical speeds of the PBP-BHA are 80 r/min and 190 r/min, which are far away from the surface rotary speed in the actual drilling site. Through comparing with the dynamic characteristics of regular BHA with the same structural parameters, it is discovered that the bend angle in the PBP-BHA plays a crucial role in improving the dynamic performance of the PBP-BHA. Moreover, the technique presented in this study can be used to make a reasonable design of BHA configuration and optimize drilling parameters.

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Arithmetic solution for the axial vibration of drill string coupling with a down-the-hole hammer in rock drilling

Cited by 12 publications

References 15 publications

Design optimization and feasibility analysis of pneumatic DTH Hammer with self-rotation bit

Design optimization and feasibility analysis of pneumatic DTH Hammer with self-rotation bit

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

Lateral vibration analysis of pre-bent pendulum bottom hole assembly used in air drilling

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