Current State and Perspectives of Development of Design of Electric Discharge Submersible Devices for Treatment of Wells

Khvoshchan, O. V.; Zhekul, V. G.; Смирнов, А. П.

doi:10.15588/1607-6761-2019-3-3

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Based on measured EHS in the literature [20] (supersonic breakdown mode, discharge gap 25 mm, needle-needle electrode), the value of h is calculated to be about 1200, and equation ( 6) can be obtained. The reference value of θ is taken as 0.5 [20] Based on equation ( 6), when the discharge energy E B is 5, 10 and 15 kJ, the peak value of the incident shock wave at R = 50 mm is 53.7, 75.9 and 93.0 MPa, respectively Based on the literature [10,11], the hydrostatic pressure has little effect on the peak value of an EHS in supersonic breakdown mode. This paper assumes that the amplitude and the pre-peak and post-peak waveforms of EHS under different static pressures are consistent.…”

Section: Model Of Ehs Peak Valuementioning

confidence: 99%

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

Xiong¹,

Liu²,

Yuan³

et al. 2021

J. Phys. D: Appl. Phys.

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To understand the application of electrohydraulic shock waves (EHS) in deep rock formations, the fracturing behaviour of repetitive EHS under a static pressure environment is studied in this paper. The static pressure environment of sandstone is simulated and a load model of the transmission wave of EHS at the liquid–rock interface is proposed. Analysis of the spatial distribution, dense zone and fracture zone of microcracks shows that static pressure has a significant inhibitory effect on the formation, distribution and growth of microcracks under repetitive EHS. Compared with normal pressure, cracks in a static pressure environment are mainly concentrated around the well hole, the microcracks are denser and the extension length is shorter. At the same time, the degree of damage is established to evaluate the overall cumulative damage to the sandstone. The coupling relationship between degree of damage, static pressure, discharge energy and discharge times is fitted. The fitting model shows a behaviour of continuous decelerating growth of microcracks, which can be divided into two phases, an initial growth phase and a slow-growth phase. The increase in static pressure mainly suppresses the initial growth phase, and the discharge energy needs to be increased to promote the initial degree of damage and the rate of accumulation of microcracks in the slow-growth phase. The rate of accumulation of microcracks in the slow-growth phase can be controlled through multi-level adjustment of the discharge energy. This paper provides guidance and simulation methods for rock fracturing applications of EHS in static pressure environments.

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Section: Model Of Ehs Peak Valuementioning

confidence: 99%

“…Hydrostatic pressure has no significant effect on the shock wave amplitude in supersonic breakdown mode. Khvoshchan et al [10] considered the changes in shock wave amplitude in a large static pressure range (0.1-20 MPa). Their results show that the static pressure does not affect the energy release of the arc channel.…”

Section: Introductionmentioning

confidence: 99%

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

Xiong¹,

Liu²,

Yuan³

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

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Dependence of Energy Processes of High-Voltage Electric-Discharge Borehole Complexes "Skif" on Characteristics of Loading

Khvoshchan¹,

Smirnov²

2022

Teh. elektrodin.

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The work determines the dependences of electrical parameters of the ground and submerged parts of the charging unit of the electric-discharge borehole complex "Skif-100M" on peculiarities of changing of electrical characteristics of the active and reactive load contributed by modern geophysical cables up to 10 km long with an active resistance from 24 to 644 Ohm, capacitance from 0.2 to 1.8 μF and inductance from 2.9 to 31 mH. New dependences and conditions to increase the charging power of storage capacitor, the output power of the complex and the voltage of ground part of its power supply from load parameters were determined on the basis of analysis of transients in the charging circuit of a complex. There were realized necessary energy characteristics for creation of a universal submersible charging unit to increase energy efficiency and productivity of high-voltage borehole electric-discharge complexes of "Skif" type. The obtained results provide effective modernization of the domestic submersible electric-discharge equipment of such complexes (in particular, their ground power sources and submersible charging units). This extends the scope of their application in the oil and gas industry of Ukraine and increases the attractiveness of investment of foreign companies engaged in the processing of oil wells in different countries of the world to the Ukrainian economy. References 11, figures 4, tables 3.

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Current State and Perspectives of Development of Design of Electric Discharge Submersible Devices for Treatment of Wells

Cited by 2 publications

References 2 publications

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

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

Dependence of Energy Processes of High-Voltage Electric-Discharge Borehole Complexes "Skif" on Characteristics of Loading

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