Features of CO 2  fracturing deduced from acoustic emission and microscopy in laboratory experiments | Zendy

Ishida Tsuyoshi | Zendy; Chen Youqing | Zendy; Bennour Ziad | Zendy; Yamashita Hiroto | Zendy; Inui Shuhei | Zendy; Nagaya Yuya | Zendy; Naoi Makoto | Zendy; Chen Qu | Zendy; Nakayama Yoshiki | Zendy; Nagano Yu | Zendy

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Features of CO 2 fracturing deduced from acoustic emission and microscopy in laboratory experiments

Author(s) -

Ishida Tsuyoshi,

Chen Youqing,

Bennour Ziad,

Yamashita Hiroto,

Inui Shuhei,

Nagaya Yuya,

Naoi Makoto,

Chen Qu,

Nakayama Yoshiki,

Nagano Yu

Publication year - 2016

Publication title -

journal of geophysical research: solid earth

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.983

H-Index - 232

eISSN - 2169-9356

pISSN - 2169-9313

DOI - 10.1002/2016jb013365

Subject(s) - acoustic emission , hydraulic fracturing , oil shale , viscosity , carbon dioxide , supercritical fluid , materials science , optical microscope , microstructure , mineralogy , geothermal gradient , composite material , fracturing fluid , petroleum engineering , geology , scanning electron microscope , chemistry , geophysics , paleontology , organic chemistry

We conducted hydraulic fracturing (HF) experiments on 170 mm cubic granite specimens with a 20 mm diameter central hole to investigate how fluid viscosity affects HF process and crack properties. In experiments using supercritical carbon dioxide (SC‐CO 2 ), liquid carbon dioxide (L‐CO 2 ), water, and viscous oil with viscosity of 0.051–336.6 mPa · s, we compared the results for breakdown pressure, the distribution and fracturing mechanism of acoustic emission, and the microstructure of induced cracks revealed by using an acrylic resin containing a fluorescent compound. Fracturing with low‐viscosity fluid induced three‐dimensionally sinuous cracks with many secondary branches, which seem to be desirable pathways for enhanced geothermal system, shale gas recovery, and other processes.

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