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Concrete In Australia : September 2011
22 Concrete in Australia Vol 37 No 3 RESEARCH IN PROGRESS Sequestration of anthropogenic CO2 into deep sedimentary rock provides an effective mitigation option for reducing greenhouse gas concentration in the atmosphere. Worldwide, there have been 18 demonstration and commercial geological storage projects in successful operation since 1996. Currently, in an injection well bore, the annular space between the formation and the casing which is a potential pathway for long-term CO2 leakage is sealed off by API recommended class "G" or "H" cement. However, it has been demonstrated by several studies that existing cements are not capable of providing long-term durability (~1000 years) to the risks associated with the potential well bore leakage in an acidic environment. e objective of this research is to investigate the long-term integrity of geopolymer cement in CO2 geosequestration saline reservoir simulated subterranean conditions. To this end, a reservoir simulated laboratory experimental program has been undertaken to investigate potential material attributes of the proposed sealant material and justify its applicability in well bore situations. It has been planned to evaluate laboratory scale simulation results with those from field scale modelling by Numerical Modelling Analysis considering both geomechanical and geochemical aspects. Considering sequestration of CO2 in geological saline reservoir, saline curing of geopolymer cement has been examined. Current result shows that the proposed cement can be cured efficiently in a saline water environment. In addition, proposed material strength has been tested in triaxial conditions considering confinement from adjoining rocks in the real field. On the other hand, real field cement sheath stress analysis has been performed by using both analytical and numerical techniques. Performed multicylinder modelling works has demonstrated the fact that the developed stress in the cement sheath cylinder can vary from highly compressive to highly tensile in nature. Future laboratory studies have been planned to perform material strength tests maintaining more realistic field conditions. Different modes of failure would be investigated by numerical modelling simulation. Apart from this, coupled geochemical and geomechanical modelling approach will also be performed. Figure 1. Potential leakage pathways in a geosequestration well-bore (a) between casing and cement wall, (b) between casing and cement plug, (c) through cement plug, (d) through casing, (e) through cement wall and (f) through cement wall and rock. Project 3: Long-term integrity of geopolymer cement as well-bore seal in geosequestration of CO2 PhD candidate: Md Giasuddin Haider Supervisors: Prof Jay Sanjayan -- Faculty of Engineering and Industrial Sciences, Swinburne University of Technology. Dr PG Ranjith -- Associate Supervisor, Faculty Member, Department of Civil Engineering, Monash University. Dr Guillermo Narsilio -- Associate Supervisor, Faculty Member, Civil Engineering, Melbourne University. Funded by: Australian Research Council Discovery Grant (ARC)