Plasma Drill for Mars Exploration

Hoftun, C.; Johansen, B. W.; Naesje, K.; Adl, P. S.; Paulsen, David; Valen, Roald; Dalen, B. S.; Lee, P.; Glass, B.; Zacny, K.; Vijendran, S.; Amundsen, Per Amund; Pattarini, Giorgio; Mohamad, Saresh; Wabakken, F.

doi:10.1061/9780784479971.067

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“…A specific EBP should satisfy two conditions: (1) there is always a partial area in the rock domain, and the partial electric field strength is greater than its partial threshold breakdown strength |E pc |; (2) condition (1) on the time scale, a certain limit time τ 0 needs to be reached. The duration of complex chemical changes (such as energy accumulation, charge movement and accumulation, phase transformation in rocks) during the EBP can be measured by boundary time τ 0 , which is the same as the 'incubation time' in equation (5) and is called lag time in this study.…”

Section: Damage Criterion For Electric Breakdown Fieldmentioning

confidence: 99%

“…As the main battlefield of oil and gas resources development turns to deep strata and hard rock strata, new high-efficiency rock-breaking technology is urgently needed to solve the problems of low production efficiency and difficult rock breaking caused by complex geological conditions [1]. High-voltage electric pulse (HVEP) technology stands out for its high energy consumption efficiency, green environmental protection, and drilling cost independent of formation depth, which has excellent development potential [2][3][4][5]. When the pulse rising edge is less than 500 milliseconds, the high voltage breaks down the rock preferentially.…”

Section: Introductionmentioning

confidence: 99%

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The sensitivity analysis of dynamic electric breakdown damage model and simulation of granite by high voltage electric pulse

Liu

Zhang

Zhu

et al. 2023

J. Phys. D: Appl. Phys.

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The use of high-voltage electrical pulse (HVEP) technology for improving the rate of penetration (ROP) in deep, complex formations has been reported; however, its rock fragmentation mechanism is not fully understood, and the parametric design of electric drilling tools is not perfect. This research paper realized the whole process of single-pulse HVEP rock-breaking by using the electric breakdown model, combining circuit parameter coupling, Kirchhoff's law, electric breakdown criterion, heat transfer process, and solid mechanical field. The sensitivity simulation of HVEP rock-breaking parameters, which considers the structural parameters of pulse power supply, the deterioration of rock during the electrical breakdown process (EBP), the correlation between dynamic dielectric strength of rock and time, and rock heterogeneity, is analyzed. The simulation results indicate that the shape of the plasma channel has little relationship with the pulse peak voltage, and the rock-breaking volume of a single pulse is positively related to the pulse peak voltage; the electrode spacing is positively correlated with the breakdown voltage of the rock in a first-order function shape and has a positive correlation with the failure volume; large electrode spacing can promote HVEP rock-breaking; electrode tilt has little effect on the minimum breakdown voltage and failure volume, and its optimal design should be combined with the flow field analysis of the electric bit structure; the heterogeneity index of granite results in breakdown voltage amplitudes within 3 kV and differences in the fragmentation effect of HVEP. The research results can be used as theoretical support for optimizing HVEP matching drilling tools.

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Section: Damage Criterion For Electric Breakdown Fieldmentioning

confidence: 99%