Acoustic emission characteristics in hydraulic fracturing of stratified rocks: A laboratory study
Zhizhong Jiang, Quangui Li, Qianting Hua, Yunpei Liang, Yangcheng Xu, Le Liu, Xiaobing Wu, Xuelong Li, Xiaoguang Wang, Liangping Hu, Faping Ling
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 that will 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.
for unconventional natural gas production. It contains abundant information that will 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.
کال:
2020
ژبه:
english
فایل:
PDF, 1.95 MB
IPFS:
,
english, 2020