Features of CO2 fracturing deduced from acoustic emission and microscopy in laboratory experiments

Features of CO2 fracturing deduced from acoustic emission and microscopy in laboratory experiments

©2016. American Geophysical Union. All Rights Reserved. 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 dioxid...

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Bibliographic Details
Main Authors: Ishida, T., Chen, Y., Bennour, Ziad, Yamashita, H., Inui, S., Nagaya, Y., Naoi, M., Chen, Q., Nakayama, Y., Nagano, Y.
Format: Journal Article
Language:English
Published: AMER GEOPHYSICAL UNION 2016
Subjects:
Science & Technology
Physical Sciences
Geochemistry & Geophysics
FLUID VISCOSITY
CARBON-DIOXIDE
PROPAGATION
PRESSURE
WATER
SEQUESTRATION
MICROCRACKS
GRANITE
ROCK
Online Access:http://hdl.handle.net/20.500.11937/81165
Description
Summary:©2016. American Geophysical Union. All Rights Reserved. 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-CO2), liquid carbon dioxide (L-CO2), 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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