Optimal High-Voltage Generator Design for Electropulse Drilling of Deep Wells

Molchanov, Denis; Lavrinovich, Ivan

doi:10.1088/1742-6596/1172/1/012069

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The rock's porosity significantly affects the intensity of the breakdown field. The breakdown field intensity reduces as the porosity increases [38][39][40][41][42][43][44][45]. In addition, it contains a variety of fluid media, because the pore space within the rock is enclosed.…”

Section: Introductionmentioning

confidence: 99%

The influence of pore characteristics on rock fragmentation mechanism by high-voltage electric pulse

Liu¹,

Zhang²,

Zhu³

et al. 2023

Plasma Sci. Technol.

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High voltage electrical pulse (HVEP) is an innovative technique with the low-energy and high efficiency. However, the underlying physics of the electric breakdown within the rock, and the coupling mechanism between the various physical fields involved in HVEP still need to be further understood. In this study, we establish a two-dimensional numerical model of multi-physical field coupling the electrical breakdown of porous rock with randomly distributed pores to investigate the effect of pore characteristics (porosity, pore media composition) on the partial electrical breakdown of rock (i.e. the generation of plasma channel inside the rock). The findings indicate that the generation of a plasma channel is directionally selective and extends in the direction of a weak electrical breakdown intensity. As the porosity of rock increases, so does the intensity of the electric field in the "electrical damage" region—the greater the porosity, the greater the effectiveness of rock breaking. In addition, as the fraction of pore fluid (Swater/Sair) declines gradually, the generation time of the plasma channel lowers, and the efficacy of rock-breaking by HVEP increases. In addition, this article conducted an indoor experiment utilizing an electric pulse drill to break down the rock to recreate the growth mode of the plasma channel in the rock. Moreover, the experimental results are consistent with the simulation results; additionally, the development type of partial electric breakdown is verified to be related to electrode polarity and pore characteristics via the experiment of the symmetrical needle-needle electrode arrangement, which further demonstrates the mechanism of partial electric breakdown. This research is significant for comprehending the process of electric impulse rock-breaking and gives theoretical guidance and technological support for advancing electric impulse drilling technology.

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Section: Introductionmentioning

confidence: 99%

The influence of pore characteristics on rock fragmentation mechanism by high-voltage electric pulse

Liu¹,

Zhang²,

Zhu³

et al. 2023

Plasma Sci. Technol.

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“…In [26,27], the authors report the possibility of using in generators for applied purposes the sufficiently mature and proven technology of a linear pulsed transformer [28,29], previously used in powerful electrophysical installations in a single mode. The design of a linear pulsed transformer makes it possible to reduce the volume of high-voltage insulation, abandon the single insulating volume of a high-voltage capacitive energy storage, simplify the control and maintenance of the capacitors and switches of the storage, etc.…”

Section: Jinst 16 P12006mentioning

confidence: 99%

An air insulated linear pulse transformer for electrodischarge technology

2021

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A linear pulse transformer with air insulation at atmospheric pressure was created and tested under both constant resistance and non linear loads. The maximum power of the transformer output pulse reached ∼500 MW at a matched load with a charge voltage 50 kV. The transformer transferred ∼60% of the stored energy to the load over a characteristic time of about 1 μs. The scalability the generator was studied by connecting two identical transformers in series which gave a power output of ∼850 MW with doubled output voltage and reduced current. The frequency mode of operation was studied using one and two transformers with a charge voltage of 50 kV and a load that was, close to matched. In both cases, the power maximum and jitter showed no significant changes at any of the frequencies tested (up to 5 Hz). These results mean that the use of this generator can be recommended for a wide field of applications due to its scalability and low internal impedance.

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Employment of mud-pulse generator for improvement of efficiency of a wellbore producing in complex mining and geological conditions

Akhymbayeva

2024

Petroleum Research

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Optimal High-Voltage Generator Design for Electropulse Drilling of Deep Wells

Cited by 3 publications

References 2 publications

The influence of pore characteristics on rock fragmentation mechanism by high-voltage electric pulse

The influence of pore characteristics on rock fragmentation mechanism by high-voltage electric pulse

An air insulated linear pulse transformer for electrodischarge technology

Employment of mud-pulse generator for improvement of efficiency of a wellbore producing in complex mining and geological conditions

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