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Article

Research on Evolution Characteristics of Shale Crack Based on Simultaneous Monitoring of Multi-Parameters

1
Chongqing Institute of Green Intelligent Technology, Chinese Academy of Sciences, Beibei, Chongqing 400714, China
2
Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, Chongqing 408000, China
3
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
4
Graduate School, Chongqing Technology and Business University, Nan’an, Chongqing 400067, China
5
College of Software Engineering, Chengdu University of Information and Technology, Chengdu 610225, China
*
Author to whom correspondence should be addressed.
Academic Editor: Arcady Dyskin
Appl. Sci. 2022, 12(2), 860; https://doi.org/10.3390/app12020860
Received: 29 November 2021 / Revised: 9 January 2022 / Accepted: 11 January 2022 / Published: 14 January 2022
(This article belongs to the Special Issue Applications on Ultrasonic Wave ‖)
Meso-crack evolution mechanism of shale is a key factor affecting the mechanical properties of shale. In order to explore evolution laws of cracks in shale during loading, a meso-crack monitoring system, loading test equipment and an automatic ultrasonic data acquisition system were set up. On this basis, a set of experimental apparatus simultaneous monitoring multi-parameters of shale micro-crack was designed, and destruction experiments of shale samples with different bedding angles were carried out to find out evolution characteristics of cracks. The results show the following: (1) The designed apparatus can monitor ultrasonic, mechanical and video information simultaneously of crack evolution in the entire process of shale destruction under load to provide information for analyzing acoustic and mechanical characteristic responses of crack propagation at key time nodes. (2) With an increase in load, shale will undergo four stages of destruction: crack initiation, propagation, penetration and overall failure. In the course of these stages, acoustic characteristics and mechanical characteristics are in good agreement, which proves the validity of predicting rock mechanical parameters with acoustic data. (3) During the loading process of shale, the main amplitude of acoustic wave is more sensitive than mechanical parameters to the change of rock cracks. Research results have important theoretical reference value for evaluating wall stability of shale gas horizontal well with ultrasonic data. View Full-Text
Keywords: shale; meso-crack; evolution characteristics; borehole stability; ultrasonic shale; meso-crack; evolution characteristics; borehole stability; ultrasonic
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MDPI and ACS Style

Chen, Q.; Xu, F.; Su, P.; Zhu, H.; Zhang, Y.; Liu, Y.; Jia, D.; Guo, X.; Chen, J.; Liu, D. Research on Evolution Characteristics of Shale Crack Based on Simultaneous Monitoring of Multi-Parameters. Appl. Sci. 2022, 12, 860. https://doi.org/10.3390/app12020860

AMA Style

Chen Q, Xu F, Su P, Zhu H, Zhang Y, Liu Y, Jia D, Guo X, Chen J, Liu D. Research on Evolution Characteristics of Shale Crack Based on Simultaneous Monitoring of Multi-Parameters. Applied Sciences. 2022; 12(2):860. https://doi.org/10.3390/app12020860

Chicago/Turabian Style

Chen, Qiao, Fenglin Xu, Pengcheng Su, Honglin Zhu, Yifang Zhang, Yang Liu, Dongming Jia, Xiaozai Guo, Jilong Chen, and Dunlong Liu. 2022. "Research on Evolution Characteristics of Shale Crack Based on Simultaneous Monitoring of Multi-Parameters" Applied Sciences 12, no. 2: 860. https://doi.org/10.3390/app12020860

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