Breakage of rocks by pulsed electric discharge at elevated pressures and temperatures

Vazhov, V. F.; Gafarov, R. R.; Datskevich, S. Yu.; Zhurkov, M. Yu.; Лопатин, В. В.; Muratov, V. M.; Jeffryes, B.

doi:10.1134/s1063785011040286

Cited by 8 publications

(3 citation statements)

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“…As it is known, the more the number of pulses applied, the wider and deeper the excavation cavity is [2,8]. This causes the discharge channel to be getting longer.…”

Section: Resultsmentioning

confidence: 99%

Multiple Rock Breakdown in Electrodischarge Technology

Vazhov

Datskevitch

Zhurkov

et al. 2016

KEM

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The article covers the research of the electric strength and fracture of rocks that are undergone multiple breakdowns generated by electric discharge rock fracture and drilling technologies. The research outcomes allow proposing an experimental technology able to determine operating high voltage pulse values in the electric discharge drilling process where one should take into account such factors as the rock re-crushing and the drill bit shift cyclicity.

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“…As it is known, the more the number of pulses applied, the wider and deeper the excavation cavity is [2,8]. This causes the discharge channel to be getting longer.…”

Section: Resultsmentioning

confidence: 99%

Multiple Rock Breakdown in Electrodischarge Technology

Vazhov

Datskevitch

Zhurkov

et al. 2016

KEM

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“…This voltage gradient generates a plasma, increases the pore pressure, imposes stresses beyond the tensile strength of rock, and ultimately results in the fracturing of the granite. Experimental studies have demonstrated the significant impact of three different parameters on rock damage during PPGD: (1) the maximum pulse voltage drop, V T,Max , (2) the voltage pulse rise time, τ R , and (3) the rock pore size, d P [10,13,48,51]. Therefore, our numerical simulations are conducted on granite pores with pore sizes between 10 and 100 µm, electric pulses from 200 to 500 kV, and voltage rise times from 30 to 300 ns.…”

Section: Model Descriptionmentioning

confidence: 99%

Simulating Plasma Formation in Pores under Short Electric Pulses for Plasma Pulse Geo Drilling (PPGD)

et al. 2021

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Plasma Pulse Geo Drilling (PPGD) is a contact-less drilling technique, where an electric discharge across a rock sample causes the rock to fracture. Experimental results have shown PPGD drilling operations are successful if certain electrode spacings, pulse voltages, and pulse rise times are given. However, the underlying physics of the electric breakdown within the rock, which cause damage in the process, are still poorly understood. This study presents a novel methodology to numerically study plasma generation for electric pulses between 200 and 500 kV in rock pores with a width between 10 and 100 μm. We further investigate whether the pressure increase, induced by the plasma generation, is sufficient to cause rock fracturing, which is indicative of the onset of drilling success. We find that rock fracturing occurs in simulations with a 100 μm pore size and an imposed pulse voltage of approximately 400 kV. Furthermore, pulses with voltages lower than 400 kV induce damage near the electrodes, which expands from pulse to pulse, and eventually, rock fracturing occurs. Additionally, we find that the likelihood for fracturing increases with increasing pore voltage drop, which increases with pore size, electric pulse voltage, and rock effective relative permittivity while being inversely proportional to the rock porosity and pulse rise time.

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“…It allows increasing the de in comparison with mechanical m replacing a bit. This is one mor electropulse drilling [6,7].…”

Section: Methodsmentioning

confidence: 99%

Evaluation and improvement of economic efficiency in the sphere of bore-hole drilling methods

Kozlova

Егорова

Safrygin

2016

SHS Web of Conferences

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Abstract.One of the important requirements for the methods and technologies, especially in the extractive industry, is cost-effective use of resources. The amount of exploration and industrial bore-hole drilling for various purposes is increasing in today's world. Since drilling is the main type of exploration, it is necessary to improve the technology and to reduce costs. The article discusses an alternative to the existing method of bore-hole drilling developed in Tomsk Polytechnic University on the basis of the discovery made by scientists of the University. Electric pulse drilling technology is an innovation with the estimated base of evidence. The technique consists of rock breaking without drilling in it. This technology is fundamentally different from the existing ones; therefore, its application requires modification and updating of all operation systems. High barriers to entry and introduction to the industry are specific to electric pulse drilling. The authors concluded that the technology of electric pulse drilling provides an alternative of production methods and tools, which allows finding the best option to reduce costs and thereby to increase resource efficiency of production or project.

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Breakage of rocks by pulsed electric discharge at elevated pressures and temperatures

Cited by 8 publications

References 0 publications

Multiple Rock Breakdown in Electrodischarge Technology

Multiple Rock Breakdown in Electrodischarge Technology

Simulating Plasma Formation in Pores under Short Electric Pulses for Plasma Pulse Geo Drilling (PPGD)

Evaluation and improvement of economic efficiency in the sphere of bore-hole drilling methods

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