Investigation of heating of the drilling bits and definition of the energy efficient drilling modes

Dreus, Andrii; Kozhevnikov, A.; Lysenko, K. V.; Sudakov, Andrii

doi:10.15587/1729-4061.2016.71995

Cited by 18 publications

(17 citation statements)

References 4 publications

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“…During analysis of technology of stoping operations conducting in mining blocks [21], it is possible to draw a conclusion that the technology of ore breaking at the chamber mining method provides application of considerable volumes of trotyl-content explosives. Therefore, for improvement of stoping operations conducting it is offered to improve technological parameters of drilling-and-blasting operations conducting [22], name ly to offer new technology with explosives emulsion application during miing of deposits of any thickness. For improvement of stoping operations conducting at the chamber mining method, it was proposed by the authors to improve the existing method of calculation of drilling-and-blasting operations parameters for ore breaking with application of emulsion explosives [23].…”

Section: I N I N Gmentioning

confidence: 99%

Increasing ecological safety during underground mining of iron-ore deposits

Khomenko¹,

Kononenko²,

Myronova³

et al. 2018

SBNMU

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Purpose. To create the technology increasing the level of ecological safety of underground mining of iron ores by means of decreasing the number of harmful substances released into the atmosphere.methodology. Laboratory and industrial research studies of the condition of the atmospheric air around mine arrangement were conducted by means of a physical-and-chemical method and biological testing. The standard method for calculation of their concentration in the atmosphere was used for determination of features of harmful substance dispersion.findings. Regularities of ground concentration of total influence of harmful substances changing with taking into account a specific consumption of explosives and distance from an emission source are revealed. The dependence of conditional indicator of damageability of bioindicators changing with increase in distance from a source of emission and specific consumption of explosives is established. The method for calculation of ecological assessment of atmospheric air condition around an emission source is developed.originality. Dependence of influence of ground concentration of harmful substances on damageability of bioindicators at the cellular and organismal levels is established, which allows estimating an ecological state of atmospheric air on industrial territories.Practical value. Regularities of inluence of ground concentration of total impact of harmful substances on a condition of indicator systems are determined that allows estimating the state of the environment and increasing reliability of local environmental monitoring around an iron-ore mine. The technology of drilling-and-blasting operations conducting in which emulsion explosives are used during mining of iron ores by means of the chamber mining methods, which allows decreasing the hazard index of harmful substances influence on the atmosphere, is developed and implemented.

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Section: I N I N Gmentioning

confidence: 99%

Increasing ecological safety during underground mining of iron-ore deposits

Khomenko¹,

Kononenko²,

Myronova³

et al. 2018

SBNMU

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“…1D mathematical model was developed to describe the process of drill bit heating; the said model is a system of one-dimensional equations of heat conductivity for various zones of the drill bit (diamonds, matrix and steel body of the drill bit). Applying this approach to the description of heat exchange process of the drill bit seems to be justified by the results of CFD-modeling defined in [11]. The research revealed that only the changes of the temperature field along the height of the drill bit are of significant nature.…”

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confidence: 97%

“…Work [11] stipulates that drilling with pulse mode of drilling fluid circulation rate does not only result in the increase in the contact temperature, but also enhances the drilling velocity. The thermal factor plays a particular role during the drilling processes with air or gas flushing or foams flushing.…”

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confidence: 99%

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Drilling fluid circulation rate influence on the contact temperature during borehole drilling

Kozhevnykov¹,

Dreus²,

Лиу³

et al. 2018

SBNMU

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ВплиВ Витрати промиВальної рідини на контактну температуру при бурінні сВердлоВинPurpose. To establish the influence of drilling fluid circulation rate onto the contact temperature during the rotation drilling using an impregnated diamond drill bit; to verify the mathematical model of the diamond drill bit heating process in the course of boreholes drilling.Methodology. Bench experiments and theoretical analysis using methods of mathematical modeling. Findings. In the course of the bench experiments the data of influence of the drilling fluid circulation rate on the contact temperature during drilling of granite rock with a 59-mm diameter drill bit were obtained. A relevant mathematical model of the drill bit heating under the variable rate of drilling fluid was represented on the basis of a system of the heat transfer differential equations. A comparative analysis of experimental and predicted data was carried out, and its findings positively confirm the reliability of the mathematical modeling of heat transfer processes in the downhole during bore-hole drilling.Originality. The methodology of experimental measuring of the contact temperature during the bench experiment borehole drilling using resistance sensors was proposed herein. New experimental data was obtained which allowed establishing a correlation between the contact temperature and the rate of drilling fluid in the downhole area. The proposed mathematical model of the process is found to be adequate; it allows predicting the temperature mode on the working face of borehole in the course of drilling. The findings of the research make it possible to substantiate the effect of the diamond core drilling performance gaining due to transition from the fixed time operation parameters to the variable ones.Practical value. The regularities of action of the drilling fluid circulation rate on the contact temperature of the "tool -working face" system in the course of borehole drilling were established. The performed research confirmed the possibility of managing the thermal mode of drilling by variation of the drilling fluid circulation rate. The diamond core drilling performance gains, therefore, are possible to achieve by way of increasing the thermal stimulation of the mining rock. The developed mathematical model allows forecasting the contact temperature in the course of borehole drilling for various values of the drilling fluid circulation rates. Using of this model makes it possible to define the permissible diminishing of the drilling fluid circulation rate in order to prevent any abnormal thermophysical wear of the drill bit.Keywords

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“…In addition, the drilling tool is exposed to friction and contact forces, inertia forces, and others. These phenomena have a negative effect on the elements of the drill string and the bit and generally lead to energy losses [1,2] and a decrease in the technical and economic indices of drilling [3,4].…”

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confidence: 99%

Mathematical model of oscillations of a drill tool with a drill bit of cutting-scraping type

Chudyk¹,

Raiter²,

Grydzhuk³

et al. 2020

Nauk. visn. nat. hirn. univ.

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Purpose. Finding the cause and effect relationships between the parameters of nonstationary longitudinal and torsional vibra tions of a drilling tool and developing a mathematical model to study their properties.Methodology. The solution to this problem is based on one of the basic principles of analytical mechanics -the Lagrange principle. The equation of motion of the studied rod mechanical system with four degrees of freedom is made using the Lagrange equation of the second kind, which is one of the next stages of its dynamic analysis.findings. In the process of solving this problem on the basis of industrial data, the analysis of axial load functions, angular rota tion speed and torque of the drilling tool for their nonstationarity was carried out. The frequency of change in these nonstation ary drilling mode functions is set by rapid Fourier transform. originality. For the first time, analytical dependences were obtained to determine the forces of cutting and friction on the bit from the second derivatives of the independent generalized coordinates of the mechanical system over time, as well as the relation ship between the generalized accelerations of the translational and rotational motions of the bodies of the mechanical system.Practical value. The practical value of the work is the obtained equations of motion of the system, taking into account the re ceived frequency compositions of the mode parameters of drilling until their subsequent numerical solution. The results of this task will further facilitate the choice of optimal modes of dynamic loading of the drilling tool in order to improve its energy efficiency and reliability. Analysis of the frequency dependences of the change in nonstationary functions of the drilling mode parameters will allow evaluating the level of wear of the rock destruction tool, as well as to predict the durability of the drill string elements.

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Investigation of heating of the drilling bits and definition of the energy efficient drilling modes

Cited by 18 publications

References 4 publications

Increasing ecological safety during underground mining of iron-ore deposits

Increasing ecological safety during underground mining of iron-ore deposits

Drilling fluid circulation rate influence on the contact temperature during borehole drilling

Mathematical model of oscillations of a drill tool with a drill bit of cutting-scraping type

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