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Title: Acoustic emission monitoring of hydraulic fracturing laboratory experiment with supercritical and liquid CO2
Authors: Ishida, Tsuyoshi  kyouindb  KAKEN_id
Aoyagi, Kazuhei
Niwa, Tomoya
Chen, Youqing  kyouindb  KAKEN_id
Murata, Sumihiko  kyouindb  KAKEN_id  orcid (unconfirmed)
Chen, Qu
Nakayama, Yoshiki
Author's alias: 石田, 毅
Keywords: acoustic emission
carbon dioxide
fluid viscosity
hydraulic fracturing
Issue Date: 29-Aug-2012
Publisher: American Geophysical Union.
Journal title: Geophysical Research Letters
Volume: 39
Thesis number: L16309
Abstract: Carbon dioxide (CO2) is often used for enhanced oil recovery in depleted petroleum reservoirs, and its behavior in rock is also of interest in CO2 capture and storage projects. CO2 usually becomes supercritical (SC-CO2) at depths greater than 1, 000 m, while it is liquid (L-CO2) at low temperatures. The viscosity of L-CO2 is one order lower than that of normal liquid water, and that of SC-CO2 is much lower still. To clarify fracture behavior induced with injection of the low viscosity fluids, we conducted hydraulic fracturing experiments using 17 cm cubic granite blocks. The AE sources with the SC- and L-CO2 injections tend to distribute in a larger area than those with water injection, and furthermore, SC-CO2 tended to generate cracks extending more three dimensionally rather than along a flat plane than L-CO2. It was also found that the breakdown pressures for SC- and L-CO2 injections are expected to be considerably lower than for water.
Rights: ©2012. American Geophysical Union.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1029/2012GL052788
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