Study of the fracturing behaviour of an electrohydraulic shock wave in sandstone under static pressure

Xiong, Liangli; Liu, Yi; Yuan, Wei; Li, Hua; Lin, Fuchang; Pan, Yuan

doi:10.1088/1361-6463/ac1cb4

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…Currently, there is no numerical simulation software available to simulate high-voltage pulse-induced rock fracturing. To address this issue and meet practical engineering needs, researchers have proposed several indirect simulation methods for high-voltage pulse-induced fracturing [7,29,30]. One of these methods is the equivalent explosion method (EEM).…”

Section: Numerical Simulationsmentioning

confidence: 99%

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Study on fracture characteristics and mechanisms of red sandstone under high-voltage pulse discharge

Hao,

Zhang,

Peng

et al. 2024

J. Phys. D: Appl. Phys.

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To investigate the influences of geometrical size and discharge voltage of the pulse discharge equipment on the fracture characteristics and mechanisms of sandstone under high-voltage pulses, a series of experiments was conducted using a high-voltage pulse discharge device on sandstone circular disc specimens of sandstone with a thickness of 10 mm. These experiments covered a range of disc diameters ranging from 50 mm to 142 mm and discharge voltages from 15 kV to 40 kV. Through these experiments, the fracture characteristics of sandstone at both macroscopic and microscopic levels were investigated. In the experiments, a quantitative analysis of surface fracture was undertaken based on fracture density and fractal damage. Additionally, using the principle of energy equivalence, numerical simulation methods were used to study the damage evolution process in sandstone. The research results indicate that the formation and distribution of fractures in the sandstone specimens are significantly affected by geometrical size and discharge voltage. By analyzing the interaction between stress waves and fracture propagation, combined with indoor experimental results, the fracture mechanism was revealed. The high temperature and shock wave generated by the plasma channel leads to the crushing zone near the electrode, while the circumferential tensile component of the stress wave can result in radial fractures, and the reflected tensile wave leads to circumferential and radial fractures near the boundary.

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Section: Numerical Simulationsmentioning

confidence: 99%

“…less energy [5][6][7]. At present, more attention has been paid to rock breaking with pulsed high-voltage discharges [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study on fracture characteristics and mechanisms of red sandstone under high-voltage pulse discharge

Hao,

Zhang,

Peng

et al. 2024

J. Phys. D: Appl. Phys.

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Electrochemical Investigation of Plasma Channels During Hydraulic‐Electric Pulsed Discharges

Liu,

Zhou,

Zhang

et al. 2024

Contrib. Plasma Phys

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The hydraulic‐electric pulsed discharge(HEPD) rock‐breaking technology is a new high‐efficiency technology that generates plasma shock waves to rupture rocks. Since the plasma channel formation mechanism involved in HEPD rock‐breaking technology is difficult to describe, there are fewer theoretical models of this technology. This paper establishes a HEPD plasma model, which integrally considers the mutual coupling between five physical fields. The multi‐physical field model realizes the whole process of plasma channels, breakdown channels, plasma shock waves, and plasma shock wave rock‐breaking during the HEPD. The changes in mass fraction, density, and diffusion flux of relevant elements in the electrochemical reaction equation of the plasma channel are comprehensively analyzed. The obtained plasma multiphysics field model shows that the interpenetration of charged ions forms the breakdown channel and plasma channel. The anion number density is related to the H‐ number density, and the decrease in H‐ number density is due to the fact that the energy in the plasma channel is not sufficient to satisfy the relevant chemical equations to continue the collision reaction. The damage to the rock by the plasma shock wave takes the form of a gradual spreading of the plasma shock wave from the center of the rock to the edges, which leads to rock fragmentation. The model has the potential to establish a link between HEPD rock‐breaking parameters and the efficiency of HEPD rock‐breaking, which could provide a practical way for the development and parameter optimization of hydraulic‐electric pulsed discharge rock‐breaking tools.

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Damage analysis of cement sheath and rock subjected to electrohydraulic shock waves under the perforation completion

Zhang,

Yu,

et al. 2024

Energy Science & Engineering

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The high‐voltage pulse discharge technology, which is based on the electrohydraulic effect, can generate powerful, controllable, and repetitive electrohydraulic shock waves (EHSWs) in underground confined space, so it has been applied in the petroleum industry to improve the permeable of the reservoir. In this paper, a numerical model based on LS‐DYNA is built to study the damage analysis of the cement sheath and rock subjected to EHSWs during perforation completion. The results show that the stress state of the cement sheath and rock surrounding the perforation hole is determined by the shock pressure from both the perforation hole and the wellbore; the damage of the cement sheath and rock is mainly caused by tensile stress; the damage zone of the cement sheath is mainly distributed on the inner surface and near the perforation hole, while the damage zone of rock is distributed near the perforation hole; after multiple discharges, the damage of cement sheath and rock gradually accumulates, and the damage zone eventually forms a vertical plane along perforation holes. Overall, these results provide guidance for the safe application of the high‐voltage pulse discharge technology in the oil field.

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Study of the fracturing behaviour of an electrohydraulic shock wave in sandstone under static pressure

Cited by 9 publications

References 29 publications

Study on fracture characteristics and mechanisms of red sandstone under high-voltage pulse discharge

Study on fracture characteristics and mechanisms of red sandstone under high-voltage pulse discharge

Electrochemical Investigation of Plasma Channels During Hydraulic‐Electric Pulsed Discharges

Damage analysis of cement sheath and rock subjected to electrohydraulic shock waves under the perforation completion

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