Acoustic emission characteristics in hydraulic fracturing of stratified rocks: A laboratory study

被引：40
|
作者：
Jiang, Zhizhong [1 ,2 ]
Li, Quangui [1 ,2 ,3 ]
Hu, Qianting [1 ,2 ]
Liang, Yunpei [1 ,2 ]
Xu, Yangcheng [1 ,2 ]
Liu, Le [1 ,2 ]
Wu, Xiaobing [1 ,2 ]
Li, Xuelong [1 ,2 ,3 ]
Wang, Xiaoguang [1 ,2 ]
Hu, Liangping [1 ,2 ]
Ling, Faping [1 ,2 ]
机构：
[1] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Sch Resources & Safety Engn, Chongqing 400044, Peoples R China
[3] Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo, Henan, Peoples R China
来源：
POWDER TECHNOLOGY | 2020年 / 371卷
基金：
中国国家自然科学基金;
关键词：
Acoustic emission; Hydraulic fracturing; Coalbed methane; Peak frequency; FAILURE; SHALE; COAL; CLASSIFICATION; FREQUENCY; STRENGTH; CONCRETE;
D O I：
10.1016/j.powtec.2020.05.050
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Acoustic emission (AE) is a popular technique to monitor the process of rock failure during hydraulic fracturing for unconventional natural gas production. It contains abundant information thatwill be useful to study in-depth the nature of hydraulic fracturing. In this study, we focused on the AE count, energy, peak frequency, crack classification, and location recorded from four rock specimens subjected to a specific triaxial stress condition. We found the multi-frequency-response phenomenon of AE, and proposed the multi-frequency-response index to indicate the moment of the macrohydraulic crack formation. Furthermore, it was found that the power law distribution index of AE energy of non-stratified specimen was bigger than that of stratified specimens during hydraulic fracturing. The tensile crack dominated in all hydraulic fracturing tests. Our results are of significance for understanding hydraulic fracturing in stratified rocks. (C) 2020 Elsevier B.V. All rights reserved.
引用
收藏
页码：267 / 276
页数：10
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