Study on the Law of the Effect of Rock Pore Properties on the Electric Pulse Rock Breaking

doi:10.3969/j.issn.1006-6535.2021.01.022

Abstract

Abstract: In order to study on the law of the effect of rock pore properties on the electric pulse rock breaking,by taking the electric field intensity of rock under the action of electric pulse as the evaluation index,a mathematical model of the electric field intensity of rock pores was derived,a two-dimensional simulation method of the electric field intensity of rocks under the action of electric pulses was established,and a numerical simulation study and an experimental study of the law of the effect on electric pulse rock breaking were carried out.The results show that:the existence of pores will cause the electric field distortion of rocks,the electric field intensity at the junction of pores and rock matrix is the largest,and the electric pulse breakdown will occur first at the edge of the pores; the more the number of pores is,and the smaller the spacing is,the greater the electric field intensity is; the pore diameter,pore morphology and orientation have an important impact on the electric field intensity of rocks,and the larger the effective action surface between the pores and the electric field lines is,the greater the electric field intensity is,and the more likely the rock will be broken down.The high-porosity sandstone is more likely to be electrically broken down than the low-porosity marble,and the breakdown probability of sandstone samples also increases with the increase of porosity.The results of the study clarify the important effect of pores on electric pulse rock breaking,which is of great significance for understanding the mechanism of the electric pulse rock breaking.

Key words: electric pulse, rock breaking mechanism, rock pore, electric breakdown, electric field intensity

CLC Number:

TE242

Bai Lili, Li Zheng, Wang Ying, Yan Tie, Sun Wenfeng, Li Zhaoxuan, Liu Shicheng. Study on the Law of the Effect of Rock Pore Properties on the Electric Pulse Rock Breaking[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 148-153.

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