Determination of Efficient Rotary Percussive Drilling Techniques for Strong Rocks

Karpov, V. N.; Petreev, A. M.

doi:10.1134/s1062739121030108

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…One of the most important variables studied in percussion drilling, particularly in DTH drilling, is the impact frequency [6][7][8], defined as the number of impacts of the hammer bit over the drilling surface per unit of time. Numerical simulations reported in [9] suggest that a significant increase of RoP can be achieved by increasing the percussive frequency of pneumatic hammers.…”

Section: Introductionmentioning

confidence: 99%

Identification of Impact Frequency for Down-the-Hole Drills Using Motor Current Signature Analysis

et al. 2023

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In rotary-percussion drilling, the impact frequency is a crucial variable that is closely linked to operational factors that determine the efficacy of the drilling process, such as the rate of penetration, bit wear, and rock mass characteristics. Typical identification methods rely on complex simulation models or the analysis of different sensor signals installed on specially adapted setups, which are difficult to be implemented in the field. This paper presents a novel study where the impact frequency is identified by motor current signature analysis (MCSA) applied to an induction motor driving a DTH drilling setup. The analysis of the case study begins with the definition of characteristic drilling stages where the pressure and sound signals allow the detection of an impact frequency of 14.10 Hz, which is then used as a reference to validate three MCSA identification approaches. As a result of the analysis, the envelope approach is the most robust for nearly real-time implementations considering its simplicity and range of coverage. Experimental results provide evidence about the feasibility of the proposed MCSA methods to be integrated into Measurement-While-Drilling (MWD) systems to improve drilling condition monitoring and rock mass characterization.

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Section: Introductionmentioning

confidence: 99%

Identification of Impact Frequency for Down-the-Hole Drills Using Motor Current Signature Analysis

et al. 2023

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“…From an experimental point of view, Scaccabarozzi and Saggin [18] measured and characterised the propagation of stress waves on a drill bit during percussive rock drilling. Estimation criteria for ensuring efficient rotary percussive drilling with down-the-hole hammers were proposed by Karpov and Petreev [19]. Ding et al [20] investigated the effect of rotational speed and impact speed on a rotation-percussion drilling process of rock using a diamond bit by monitoring the stress wave during drilling.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics of Vibro-Impacting Indenter

2023

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We investigated a vibro-impacting indenter interacting with strata in the form of metal or rock samples experimentally and via mathematical modelling. An experimental programme was undertaken on the custom-designed rig at the Centre for Applied Dynamics of the University of Aberdeen. The mathematical models captured the essential mechanics when the indenter interacted with the metal or rock samples. The mathematical functions describing the discontinuous phases were specific to the metal and rock samples. Appropriate switch functions were constructed for indenter positions, as well as for the penetration depth, wherever appropriate. To seek a correlation between the experiments and modelling, a careful direct numerical integration of the equations of motion describing each discontinuous phase of the system dynamic response enabled time histories, phase trajectories and amplitude spectra to be computed. The developed mathematical model facilitates the optimisation of vibro-impact dynamical responses.

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“…Karpov and Petreev solved the problem of determining eff ective methods of perforation drilling using pneumatic hammers and proposed criteria for evaluating ranges of their values that ensure drilling with minimal energy consumption and crown wear [19]. The authors presented the calculation formulas of drilling technologies and showed the eff ectiveness of maximum destruction with minimal impacts per full turn of the drill.…”

Section: Introductionmentioning

confidence: 99%

“…The upper limit of the angle of rotation of the crown between impacts at maximum drilling power and minimum energy consumption during the destruction and wear of tungsten carbide plates has been established. Drilling methods using impact drills based on various models of impact tools can be optimised in accordance with the energy criterion of rock destruction and the energy intensity of the crack [19]. In the work by Bondarenko, et al, the classifi cation of pulse drilling technologies is considered, including such drilling methods as monoparametric, two-parameter, and three-parameter [20].…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of drilling hard rocks using hydraulic shock technology

Akhymbayeva¹,

Nauryzbayeva²,

Mauletbekova³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. To test the theoretical provisions for calculating the geometric and gas-dynamic parameters of a hydropulse apparatus for strikers using core pipes. Methodology. The research methodology is based on the tests carried out. The tests were conducted between January 6, 2021, and April 28, 2021. The type of test is laboratory bench trials. In the course of the study, methods of synthesis and analysis of information were applied. Finding. The basic design parameters of a hydro-pulse generator capable of operating efficiently with impact machines were obtained during the bench research. The optimal scheme of air flow distribution at the exhaust of the hydraulic hammer has been established. The optimal value of the pressure drop in the operating and blocking modes of operation of the generator is determined. In addition, the optimal value of the ejection coefficient in these two modes of operation of the generator was determined. Originality. The article investigated the technologies of drilling hard rocks in order to optimise the basic geometric parameters of the hydraulic pulse generator, to distribute the working flow in front of the jet blower, to measure the value of the ejection coefficient and pressure drop to clarify the composition and methodology of experiments in borehole conditions. Practical value. The presented study can be used to optimise the drilling technology as well as a basis for training specialists in the field of hard rock drilling using hydraulic percussion technology.

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Determination of Efficient Rotary Percussive Drilling Techniques for Strong Rocks

Cited by 7 publications

References 19 publications

Identification of Impact Frequency for Down-the-Hole Drills Using Motor Current Signature Analysis

Identification of Impact Frequency for Down-the-Hole Drills Using Motor Current Signature Analysis

Nonlinear Dynamics of Vibro-Impacting Indenter

Peculiarities of drilling hard rocks using hydraulic shock technology

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