Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 126
Subsurface Carbon Dioxide Storage through Clathrate Hydrate Formation
Jadhawar, P., Mohammadi, A.H., Yang, J., and Tohidi, B.
To be published in NATO Science Series IV: Earth and Environmental Sciences (2005).
Rising atmospheric emissions during fossil fuel consumption is a major concern for the developed and developing countries considering the role it plays in green house effect and hence the global climate change. Various schemes for the underground CO2 storage viz. geologic disposal into coal seams, depleted oil/gas reservoirs, salt caverns, deep oceans, have already been proposed in the literature elsewhere. Subsurface CO2 storage through clathrate hydrate formation is a novel option for reducing the atmospheric carbon content and their permanent underground disposal over the geological periods. Depths of CO2 injection, respective pressure-temperature conditions, water salinity etc. are the important factors for the successful CO2 sequestration. Furthermore if CO2 is injected/stored into methane hydrate
reservoirs it could be possible to produce low-carbon methane energy thereby offsetting the cost of CO2 transportation and disposal. In this communication, we present the results of our experimental investigations carried out for understanding the mechanisms of CH4 displacement by injected CO2 in hydrate structure, formation of simple CO2 or mixed CH4-CO2 hydrate thereby simulating the conditions CO2 injection into CH4 hydrate reservoirs. We used two sets of experimental rigs specifically designed for studying gas hydrates in porous media. They are: Medium Pressure Glass Micromodel (80 bar) for visual observation of gas hydrate formation / dissociation and distribution in porous media, and the Ultrasonic Rig (400 bar) for studying CO2 sequestration into CH4 hydrates in synthetic porous media.

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