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タイトル: Injection of Supercritical Carbon Dioxide into Granitic Rock and its Acoustic Emission Monitoring
著者: Ishida, Tsuyoshi  kyouindb  KAKEN_id
Desaki, Shuich
Yamashita, Hiroto
Inui, Shuhei
Naoi, Makoto  kyouindb  KAKEN_id
Fujii, Hirokazu
Katayama, Tatsuo
著者名の別形: 直井, 誠
石田, 毅
キーワード: Carbon dioxide
Hydraulic fracturing
Acoustic emission
Field experiment
Pre-existing joint
Breakdown
発行日: 2017
出版者: Elsevier BV
誌名: Procedia Engineering
巻: 191
開始ページ: 476
終了ページ: 482
抄録: We injected carbon dioxide (CO2) into a hole drilled around 8 m long in a granitic hot rock from the floor of the tunnel. We drilled four AE (acoustic emission) monitoring holes parallel 1 m far away from the injection hole and monitored AE events induced with hydraulic fracturing (HF). When the breakdown (BD) pressure was recorded, the pressure and the temperature satisfied the supercritical condition of CO2. The AE source distribution showed that two vertical cracks were initiated from the injection hole with BD. After 75 seconds from the occurrence of BD with no pressure increase, the AE sources started to distribute along the direction almost normal to that of the initial crack from the position around 0.7 m far away from the injection hole. It is most likely that the cracks initiated in intact rock with BD by HF and one of them bended and extended along pre-existing crack. These results suggest that CO2 migrates easily and enhances AE occurrence in a pre-existing joint.
著作権等: © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
URI: http://hdl.handle.net/2433/234999
DOI(出版社版): 10.1016/j.proeng.2017.05.206
出現コレクション:学術雑誌掲載論文等

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