Characterizing the rock perforation process by laser-induced voltage response

Transient laser-induced voltaic response in a partially illuminated dielectric core

“…Sandstone, with a larger bandgap width and smaller dielectric constant, generated the minimum transient voltage. Because of the partially aligned platy clay particles, different polariza tions occurred in the shale core with two fields perpendicular to each other, resulting in a variance in the bandgap width and the distribution of polarization charges [22,23]. When the current is parallel to the aligned axis in shale1, photoex cited carriers are easily generated in the grains aligned in the current direction.…”

“…Previously, experimental study of the destruction of car bonate rock was performed using a KrF laser beam monitored by the LIV method. The processes of surface spallation, deep spallation, and rock puncture were characterized by analyzing the relationship between voltage and the irradiation time [23]. In this study, ablation by the focused UV laser at the surfaces of the dielectric shale and sandstone cores are studied and dis cussed.…”

“…Transient laser-induced voltaic response in a partially illuminated dielectric core Xinyang Miao 1,2 , Jing Zhu 2 , Yizhang Li 2 , Honglei Zhan 2 , Kun Zhao 1,2 and Wenzheng Yue 1 the anisotropic electrical response of a dielectric shale core were also characterized under the UV laser irradiation [22]. Experimental study of the destruction of carbonate rock was also performed using a KrF laser beam monitored by the LIV method [23]. In this study, the LIV response in the dielectric shale and sandstone cores were measured under the condition where the UV laser spot was partially irradiated at the surfaces.…”