DOI: 10.1016/j.jcou.2018.05.008
Scopus记录号: 2-s2.0-85046873138
论文题名: Stress state and stress path evaluation to address uncertainties in reservoir rock failure in CO2 sequestration in deep saline aquifers: An experimental study of the Hawkesbury sandstone formation
作者: Rathnaweera T.D. ; Ranjith P.G. ; Perera M.S.A. ; Wanniarachchi W.A.M. ; Bandara K.M.A.S.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 26 起始页码: 184
结束页码: 201
语种: 英语
英文关键词: Brine
; CO2 sequestration
; Compaction
; Mean effective stress
; Pore pressure
; Reservoir rock
; Stress-strain
; Tri-axial
Scopus关键词: Aquifers
; Brines
; Calcite
; Carbon dioxide
; Compaction
; Dissolution
; Failure (mechanical)
; Hydrogeology
; Petroleum reservoir evaluation
; Petroleum reservoirs
; Pore pressure
; Sandstone
; CO2 sequestration
; Effective stress
; Reservoir rock
; Stress strain
; Tri-axial
; Stresses
英文摘要: Injecting CO2 into aquifer pore fluid (high salinity brine) in deep saline aquifers during the sequestration process causes the chemico-mineral structure to be altered through complex chemically-coupled mechanical deformations. This is as yet poorly understood in the field. The authors conducted a series of tri-axial strength tests on Hawkesbury sandstone under in-situ stress and temperature conditions to characterise the behaviour of reservoir rock upon exposure to super-critical CO2 (ScCO2) to determine this chemically-coupled mechanical behaviour. According to the findings, injection of CO2 into a brine-saturated reservoir rock mass may cause a considerable strength reduction, probably due to the rock's mineralogical alteration-induced mechanical weakening of grain contacts. This was confirmed by SEM analysis, according to which the mineral dissolution process upon exposure to ScCO2 is significant, and considerable quartz and calcite dissolution were noticed in the tested samples. Importantly, this rock mineral dissolution may alter the reservoir's natural pore geometry. This eventually affects the effective stress patterns acting on the rock matrix. In addition, the slip tendency of brine+CO2-reacted reservoir rock is increased with increasing injection pressure, revealing the fate of the resulting pore pressure-dominant effective stress field through the CO2 injection process. The results were then incorporated in the effective stress field model. This model can be used to predict the possibility of mechanical failure of reservoir rock upon CO2 injection into saline aquifers. © 2018 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111887
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia; Department of Infrastructure Engineering, University of Melbourne, Melbourne, VIC 3010, Australia
Recommended Citation:
Rathnaweera T.D.,Ranjith P.G.,Perera M.S.A.,et al. Stress state and stress path evaluation to address uncertainties in reservoir rock failure in CO2 sequestration in deep saline aquifers: An experimental study of the Hawkesbury sandstone formation[J]. Journal of CO2 Utilization,2018-01-01,26