The transient impact of the resonant flexible drill string of a sonic drill on rock

Sun, Long; Bu, Changgen; Hu, Peida; Xia, Bairu

doi:10.1016/j.ijmecsci.2017.01.014

Cited by 17 publications

(7 citation statements)

References 15 publications

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“…The prospect of the scientific direction of development of sonic drilling technologies using vibration loading to drilling tools is confirmed by researches from different countries (for example, [1][2][3]). In Babapour laboratory [4] studies have shown the possibility of the drilling rate increasing by applying axial vibrational force on the bit using a pulsed cavitation drilling tool, includes a Venturi tube that generates cavitation cavities in the drill fluid.…”

Section: Introductionmentioning

confidence: 92%

Estimation of the Mechanical Oscillatory Power of the Drill String for Rational Sonic Drilling

Zhulay

Nikolayev

Kvasha

2022

Advances in Transdisciplinary Engineering

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Efficiency analysis of sonic drilling of wells and the choice of rational operational modes of drill bit vibration loading to increase the rate of penetration was carried out. The rational operational modes are studied on the basis of an assessment of the power of the drilling process with a cavitation hydrovibrator. This paper presents an approach to calculating the mechanical oscillatory power of a drill bit. The approach uses a developed mathematical model of the dynamics of cavitation hydraulic vibrator with drill string. The mathematical model describes the interaction of drill string longitudinal vibrations and drill mud hydraulic oscillations at regime of the cavitation self-oscillations of the drilling fluid flow in the vibrator. The mechanical oscillatory power has been determined for the specific drill string. Rational operation modes of the cavitation hydrovibrator for efficient conversion of a stationary flow of drill fluid into drill bit mechanical oscillatory power and ensuring a high rate of penetration are evaluated.

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Section: Introductionmentioning

confidence: 92%

Estimation of the Mechanical Oscillatory Power of the Drill String for Rational Sonic Drilling

Zhulay

Nikolayev

Kvasha

2022

Advances in Transdisciplinary Engineering

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“…1 is siltstone with iron additives; 2 is siltstone (hardness up to 6 units); 3 is argillite (up to 2-6 units); 4 is conglomerate (up to 6-7 units); 5 is conglomerate of other compounds (up to 6 units); 6 is granite (up to 7 units); 7 is metamorphic rock (up to 6-7 units) at the same time, its strength decreases and the rate of penetration increases up to two times [15].…”

Section: Fig 1 Natural Vibration Frequency Of Some Studied Rocksmentioning

confidence: 99%

Drilling wells taking into account the dynamic properties of rocks

Zhulay,

Nikolayev

2024

Nauk. visn. nat. hirn. univ.

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The application of high-frequency vibrations to a drill bit is a promising means of increasing rate of penetration in deep hard formations. The implementation of such drill bit high-frequency vibrations is possible by installing the cavitation hydraulic vibrator in the drill string in front of the rock-cutting tool. Purpose. Evaluation of resonant modes (frequencies of oscillations) for the dynamic interaction of the mud pressure in the drill string and the drill bit longitudinal vibrations in case of contact with the rock being destroyed while drilling using the cavitation hydraulic vibrator; comparative analysis of the effectiveness of using a high-frequency mechanical vibrator and a cavitation hydraulic vibrator in case of drilling in hard rocks. Methodology. The research is based on a comparative analysis of the amplitudes and power spectral density of mud pressure oscillations of the mud and vibration accelerations in the drill bit cross section of drill string. Findings. The results are presented in the form of amplitude spectra and power spectral densities of mud pressure and vibration acceleration, as well as the dependence of the increase in the rate of penetration on the frequency of forced oscillations of the drill bit. Originality. Taking into account the influence of the cavitation hydraulic vibrator on the drill rig ROP made it possible: - to determine the resonant frequencies of pressure oscillations of the mud of the drilling tool, for the effective removal of drilled rock at the point of its contact with the drilling tool, and the longitudinal vibration accelerations of the drilling tool, to speed up rate of penetration during the construction of a well; - to evaluate the effectiveness of using a cavitation hydraulic vibrator in comparison with a high-frequency mechanical vibrator. For the studied modes of operation of the hydraulic vibrator at values of the cavitation parameter  = 0.19, the well rate of penetration increases by 40 % compared to the traditional rotary method and by 26 % compared to the vibratory hammer. For the cavitation operating mode of the hydraulic vibrator  = 0.41, the increase in the rate of penetration is 62 and 37 %, respectively. At the same time, the operating efficiency of the hydraulic vibrator was ensured at the resonant frequencies of the mud pressure with a frequency of 1,580 Hz at  = 0.19 and 1,980 Hz at  = 0.41. Practical value. For a specific design of the cavitation hydraulic vibrator as part of a drill string, by changing the frequency of the drill bit vibration impact on the rock, resonant frequencies are established that ensure the high ROP of the well.

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“…jointing, anisotropy and grain size) have been devoted over recent decades [3]. Among others, a series of investigations into resonance drilling have been undertaken [4,5]. As for intrinsic rock factors, the relationship between rock displacement response amplitude and impact frequency were obtained under different constraints and different pore distributions, through theoretical analysis and numerical simulation [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of seal rock based upon vibration model of circular plate for initial rock breaking stage

Zhang,

Liu,

Liu

2023

Second International Conference on Applied Statistics, Computational Mathematics, and Software Engineering (ASCMSE 2023)

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The rocks with plate structure are widely distributed in layered formation, especially the seal rock acting as permeability barrier. Although effects of drill bit performance, lithology and crack propagation on rock stress state have been the study focus, the investigation of the dynamic behavior of rock with plate structure, especially its resonance effect on the rock failure is still limited. In this paper, at a scale large enough to ignore its internal microcracks and pores, the seal rock can be modeled as a homogeneous and elastic plate. On basis of natural frequency solution mutually verified by finite element method (FEM), semi-analytical and Rayleigh-Ritz method, the frequency response function (FRF) in terms of different stress strength criteria and motion quantities of circular plate are investigated, by numerical simulation and modal analysis. Our conclusions manifest that the maximum principal stress, normal deformation influenced by resonance effect reach greater level than that of non-resonant conditions, but not necessarily the maximum value of the whole frequency domain due to different excitation type and energy input. The effect of dynamic interaction between inherent characteristics and external excitation can be further appreciated, based upon the proposed vibration model, for initial rock breaking stage.

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The transient impact of the resonant flexible drill string of a sonic drill on rock

Cited by 17 publications

References 15 publications

Estimation of the Mechanical Oscillatory Power of the Drill String for Rational Sonic Drilling

Estimation of the Mechanical Oscillatory Power of the Drill String for Rational Sonic Drilling

Drilling wells taking into account the dynamic properties of rocks

Dynamic behavior of seal rock based upon vibration model of circular plate for initial rock breaking stage

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