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Energies 2016, 9(7), 516; doi:10.3390/en9070516

Unconventional Gas: Experimental Study of the Influence of Subcritical Carbon Dioxide on the Mechanical Properties of Black Shale

1
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
2
Key Laboratory of Hubei Province for Water Jet Theory & New Technology, Wuhan 430072, China
3
Deep Earth Energy Lab, Department of Civil Engineering, Monash University, Melbourne 3800, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Wei-Hsin Chen
Received: 12 April 2016 / Revised: 24 June 2016 / Accepted: 27 June 2016 / Published: 7 July 2016
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Abstract

An experimental study was performed to investigate the effect of subcritical carbon dioxide (CO2) adsorption on mechanical properties of shales with different coring directions. Uniaxial compressive strength (UCS) tests were conducted on shale samples with different CO2 adsorption time at a pressure of 7 MPa and a temperature of 40 °C. The crack propagation and the failure mechanism of shale samples were recorded by using acoustic emission (AE) sensors together with ARAMIS technology. According to the results, samples with parallel and normal bedding angles present reductions of 26.7% and 3.0% in UCS, 30.7% and 36.7% in Young’s modulus after 10 days’ adsorption of CO2, and 30.3% and 18.4% in UCS, 13.8% and 22.6% in Young’s modulus after 20 days’ adsorption of CO2. Samples with a normal bedding angle presented higher brittleness index than that with a parallel bedding angle. The strain distributions show that longer CO2 adsorption will cause higher axial strains and lateral strains. The AE results show that samples with a parallel angle have higher AE energy release than the samples with a normal angle. Finally, samples with longer CO2 adsorption times present higher cumulative AE energy release. View Full-Text
Keywords: shale; subcritical carbon dioxide; mechanical properties; coring direction; Chinese shale; unconventional gas shale; subcritical carbon dioxide; mechanical properties; coring direction; Chinese shale; unconventional gas
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lyu, Q.; Long, X.; Ranjith, P.G.; Kang, Y. Unconventional Gas: Experimental Study of the Influence of Subcritical Carbon Dioxide on the Mechanical Properties of Black Shale. Energies 2016, 9, 516.

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