Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass

B.L. Avanthi Isaka, P.G. Ranjith, T.D. Rathnaweera, M.S.A. Perera and W.G.P. Kumari

Renewable Energy, 2019, vol. 136, issue C, 428-441

Abstract: Chemico-microstructural and mineralogically-induced time-dependent mechanical alterations of the reservoir rock found in the peripheral zone of a CO2-based EGS is experimentally investigated. A series of uniaxial compressive and triaxial (under 30 MPa constant confining pressure with different temperatures; 25-300 °C) strength tests on granite specimens reacted in ScCO2+water medium for different time periods was performed by coupling acoustic emission (AE) technique. The results were compared with those for intact and water-reacted rock specimens in order to better understand this weakening phenomenon. Scanning electron microscopy (SEM) was also incorporated to evaluate the microstructural and mineralogical alterations.

Keywords: CO2-Based; Enhanced geothermal system (EGS); Mineralogical analysis; Mechanical properties; In-situ stress; Australia (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:136:y:2019:i:c:p:428-441

DOI: 10.1016/j.renene.2018.12.104

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