Experimental and numarical investigation of carbon dioxide sequestration in deep saline aquifers

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2005

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İzgeç, Ömer

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Started as an EOR technique to produce oil, injection of carbon dioxide which is essentially a greenhouse gas is becoming more and more important. Although there are a number of mathematical modeling studies, experimental studies are limited and most studies focus on injection into sandstone reservoirs as opposed to carbonate ones. This study presents the results of computerized tomography (CT) monitored laboratory experiments to characterize relevant chemical reactions associated with injection and storage of CO2 in carbonate formations. Porosity changes along the core plugs and the corresponding permeability changes are reported for varying CO2 injection rates, temperature and salt concentrations. CT monitored experiments are designed to model fast near well bore flow and slow reservoir flows. It was observed that either a permeability improvement or a permeability reduction can be obtained. The trend of change in rock properties is very case dependent because it is related to distribution of pores, brine composition and as well the thermodynamic conditions. As the salt concentration decreased the porosity and thus the permeability decrease was less pronounced. Calcite scaling is mainly influenced by orientation and horizontal flow resulted in larger calcite deposition compared to vertical flow. The duration of CO2 ا rock contact and the amount of area contacted by CO2 seems to have a more pronounced effect compared to rate effect. The experiments were modeled using a multi-phase, non-isothermal commercial simulator where solution and deposition of calcite were considered by the means of chemical reactions. The calibrated model was then used to analyze field scale injections and to model the potential CO2 sequestration capacity of a hypothetical carbonate aquifer formation. It was observed that solubility and hydrodynamic storage of CO2 is larger compared to mineral

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http://etd.lib.metu.edu.tr/upload/3/12606213/index.pdf
https://hdl.handle.net/11511/15204

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Graduate School of Natural and Applied Sciences, Thesis

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Experimental and numerical investigation of the carbon dioxide sequestration in the carbonate rocks Karbonat kayaçlarda karbon dioksit tecridinin deneysel ve sayisal olarak araştirilmasi Izgeç, Ömer; Demiral, Birol; Bertin, Henri; Akın, Serhat (2005-12-01) Started as an EOR technique to produce oil, injection of CO2 which is essentially a greenhouse gas is becoming more and more important. The relevant chemical reactions associated with injection and storage of CO in carbonate formations were studied. Porosity changes along the core plugs and the corresponding permeability changes were presented for differing CO2 injection rates, differing temperatures with dffering salt concentrations. Computerized tomography monitored experiments were designed to model fast...
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Experimental and numerical investigation of carbon sequestration in saline aquifers Izgec, O.; Demiral, B.; Bertin, H.; Akın, Serhat (null; 2005-07-28) Because of the global warming threat posed by greenhouse gases, mainly by CO2, some strategies were proposed. Along those, disposal and long term storage, of greenhouse gases is important for reducing global warming. Aquifers represent the most widely available and the second largest, naturally occurring potential store for CO2. Although there are a number of mathematical modeling studies related to injection of CO2 in deep saline aquifers, experimental studies are limited and most studies focus to sandston...

Citation Formats

Ö. İzgeç, “Experimental and numarical investigation of carbon dioxide sequestration in deep saline aquifers,” M.S. - Master of Science, Middle East Technical University, 2005.