Novel deep drilling technology based on electric plasma developed in Slovakia

Kocis, Igor; Kristofic, Tomas; Gebura, M.; Horváth, G.; Gajdoš, Matúš; Stofanik, V.

doi:10.23919/ursigass.2017.8105224

Cited by 14 publications

(8 citation statements)

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“…Compared with conventional acidizing and hydraulic fracturing technology, electric explosion technology has the advantages of simple construction process, short construction period, and environmental protection. Since the 1960s, there has been much research on the basic theory and principle prototype [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Energy-load Matching and Shockwave Analysis of Electrical Explosion

Han,

Liu,

Guo

et al. 2023

J. Phys.: Conf. Ser.

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Electrical explosion shockwave is a technique for inducing formation resonance by the interruption of formation pressure balance. By matching complex nonlinear influencing factors, this paper optimizes the engineering parameters and estimates the influence range of the shockwave. It achieves the objective of efficient shockwave acquisition and amplitude control. The test apparatus rapidly discharges the stored energy of various capacitance-voltage schemes, causing the load of various diameter-length structures to generate shaped shockwaves. By characterizing the discharge circuit and the shockwave signal, the energy and load matching was studied. Extraction of shockwave signal characteristics for decomposition and reconstruction analysis. The matching results indicate that the 10 MW loop oscillation is generated within 5 μs of discharge time, with the load diameter structure getting a major effect on the deposited energy. The 50 MPa shaped shockwave is generated in a 100 mm diameter region. And the peak pressure is influenced primarily by the load length structure and voltage scheme. The optimal load structure is D = 0.2 mm and L = 25 mm, controlling 2 to 5 times the input power’s enthalpy and increasing the voltage to create the shockwave more efficiently. The results of shockwave analysis indicate that the signal’s time-domain characteristics correspond precisely with its propagation path. The wavelet packet analysis indicates that the shockwave possesses a broad frequency and a high peak. The detection signal is composed of the principal shock wave, the radiation pressure wave, and the resonance error. The results provide theoretical basis for engineering application.

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Section: Introductionmentioning

confidence: 99%

Energy-load Matching and Shockwave Analysis of Electrical Explosion

Han,

Liu,

Guo

et al. 2023

J. Phys.: Conf. Ser.

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“…These shortcomings and the quest for harnessing deep geothermal energy in cold areas, like Scandinavia, have stimulated an intensive search for non-mechanical drilling and comminution methods. These methods include plasma jet drilling [2], electro-pulse drilling [3][4][5], microwave-induced breakage [6], and thermal shock (flame jet)-induced drilling and cracking of rock [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Thermal jet drilling of granite rock: a numerical 3D finite-element study

Saksala

Kouhia

Mardoukhi

et al. 2021

Phil. Trans. R. Soc. A.

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This paper presents a numerical study on thermal jet drilling of granite rock that is based on a thermal spallation phenomenon. For this end, a numerical method based on finite elements and a damage–viscoplasticity model are developed for solving the underlying coupled thermo-mechanical problem. An explicit time-stepping scheme is applied in solving the global problem, which in the present case is amenable to extreme mass scaling. Rock heterogeneity is accounted for as random clusters of finite elements representing rock constituent minerals. The numerical approach is validated based on experiments on thermal shock weakening effect of granite in a dynamic Brazilian disc test. The validated model is applied in three-dimensional simulations of thermal jet drilling with a short duration (0.2 s) and high intensity (approx. 3 MW m −2 ) thermal flux. The present numerical approach predicts the spalling as highly (tensile) damaged rock. Finally, it was shown that thermal drilling exploiting heating-forced cooling cycles is a viable method when drilling in hot rock mass. This article is part of the theme issue ‘Fracture dynamics of solid materials: from particles to the globe’.

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“…Recently, certain interest has been observed in the application of low-temperature plasma action of rock [9]. Such contactless drilling method helps reduce considerably the time spent for technological operations; it is also more economically expedient comparing to the flame drilling method.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modelling of thermal stresses within the borehole walls in terms of plasma action

Bulat¹,

V.²,

Dreus³

et al. 2021

Min. miner. depos.

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Purpose is the development of a mathematical model to study and describe thermal processes within the borehole wall in terms of plasma-based rock breaking. Methods. The following has been applied: theoretical analysis in the framework of a theory of brittle thermoelasticity breaking, methods of mathematical modeling, and computational experiment. Findings. Brief information on the results of the development of advanced plasma-based technology for borehole reaming for hard mineral mining has been represented. The results of industrial tests of plasma plant of 150-200 kW·s power with plasma-generating gas in the air for hard rock breaking have been represented. The plant and plasma-based technology of borehole reaming were tested in underground conditions of Kryvbas mines while reaming a perimeter hole to drive a ventilation rise in silicate-magnetite quartzites. A mathematical model has been proposed to analyze heat and mechanical fields in the rock during the plasma-based action on the borehole walls. Numerical studies of the temperature dynamics and thermal stresses within the borehole-surrounding rock layer have been carried out. It has been demonstrated that if low-temperature plasma is used (Т = 3500-4000°С), thermal compressing stresses are induced within the thin rock layer; the stresses may exceed the boundary admissible ones. It has been identified that plasma-based effect on the borehole wall makes it possible to create the conditions for intense rock fracturing and breaking. Originality. Solution of a new problem of thermoelastic state of a borehole wall in terms of plasma action has been obtained. The proposed mathematical model has been formulated in a cylindrical coordinate system and considers convective and radiation heat exchange between a plasma jet and a borehole wall. Practical implications. The obtained results make it possible to assess the rock state depending on the plasma jet parameters. The proposed methods of calculations will help carry out research to evaluate breaking parameters (the required heating time, thickness of the heated layer, and approximate spall dimensions) and develop different methods for the breaking process control.

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Novel deep drilling technology based on electric plasma developed in Slovakia

Cited by 14 publications

References 0 publications

Energy-load Matching and Shockwave Analysis of Electrical Explosion

Energy-load Matching and Shockwave Analysis of Electrical Explosion

Thermal jet drilling of granite rock: a numerical 3D finite-element study

Mathematical modelling of thermal stresses within the borehole walls in terms of plasma action

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