Publications of GEG Members
All Publications of GEG Members
(since 2015, the start of the GEG Group)
Publications where at least one of the author’s primary contribution was done during the author’s affiliation with the GEG Group. To display all papers that involved a GEG group member’s work (even work conducted outside the GEG group) during and even before the author’s affiliation with the GEG Group, please uncheck the filter above ‘GEG own publications’ and submit your search.
Underlined names are links to current or past GEG members
REFEREED PUBLICATIONS IN JOURNALS
2021 (12 publications)
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 to 500 kV in rock pores with a width between 10 and 100 \(\mu\)m. 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 \(\mu\)m. 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.
2020 (33 publications)
2019 (23 publications)
2018 (14 publications)
2017 (12 publications)
2016 (8 publications)
2015 (10 publications)
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