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

Qiao Lyu, Xinping Long, Pathegama Gamage Ranjith and Yong Kang
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Qiao Lyu: School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
Xinping Long: School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
Pathegama Gamage Ranjith: Deep Earth Energy Lab, Department of Civil Engineering, Monash University, Melbourne 3800, Australia
Yong Kang: School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China

Energies, 2016, vol. 9, issue 7, 1-15

Abstract: An experimental study was performed to investigate the effect of subcritical carbon dioxide (CO 2 ) adsorption on mechanical properties of shales with different coring directions. Uniaxial compressive strength (UCS) tests were conducted on shale samples with different CO 2 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 CO 2 , and 30.3% and 18.4% in UCS, 13.8% and 22.6% in Young’s modulus after 20 days’ adsorption of CO 2 . Samples with a normal bedding angle presented higher brittleness index than that with a parallel bedding angle. The strain distributions show that longer CO 2 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 CO 2 adsorption times present higher cumulative AE energy release.

Keywords: shale; subcritical carbon dioxide; mechanical properties; coring direction; Chinese shale; unconventional gas (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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