Chromatographic partitioning of impurities (H2S) contained in a CO2 stream injected into a deep saline aquifer: Part 2. Effects of flow conditions |
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| Authors: | Stefan Bachu Mehran Pooladi-Darvish Huifang Hong |
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| Institution: | 1. Alberta Research Council, 250 Karl Clark Rd. NW, Edmonton, AB, T6N 1E4, Canada;2. Fekete Associates Inc., Calgary, Canada;3. University of Calgary, Calgary, Canada;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China;1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;3. Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan 430074, China;1. Department of Petroleum Engineering, Curtin University, 6151 Kensington, Western Australia, Australia;2. Department of Exploration Geophysics, Curtin University, 6151 Kensington, Western Australia, Australia;3. Petroleum Technology Department, University of Technology, Baghdad, Iraq;1. Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China;2. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;1. Thermal Power Engineering Department, Electric Power Development Co., Ltd., 15-1, Ginza 6-Chome, Chuo-ku, Tokyo 104-8165, Japan;2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 2519, Jiefang Street, Changchun, Jilin Province 130021, China |
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| Abstract: | Laboratory experiments reported in a companion paper were carried out to examine the chromatographic partitioning of impurities contained in a stream of CO2 injected into a deep saline aquifer. The solubility of the impurity gas in the CO2 stream compared to that of CO2, the in situ conditions of pressure, temperature and water salinity, and the concentration of the impurity gas affect the partitioning of the two gases. For CO2 streams containing H2S, numerical simulations reported here have successfully replicated the laboratory results including the breakthrough of CO2 ahead of H2S. Sensitivity analysis performed with the numerical model has shown that flow conditions, controlled by such parameters as medium permeability, pressure gradient, dispersion, gas mobility and flow direction, affect the breakthrough time and separation of the two gases, leading to delayed or earlier breakthrough, and increasing or decreasing the time lag between the breakthrough of the two gases. Vertical bottom-up flow leads to earlier breakthrough, while top-down flow leads to delayed breakthrough. These results are important in establishing monitoring strategies at CO2 storage sites and in evaluating the risks associated with the possible leakage of injected CO2 that contains impurities. |
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