Application of analytical solutions to storage of CO2

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

Application of analytical solutions to storage of CO2
Author:Jan M. Nordbotten <> (University of Bergen)
Michael A. Celia <> (Princeton University)
Presenter:Jan M. Nordbotten <> (University of Bergen)
Date: 2006-06-18     Track: Special Sessions     Session: Geologic Sequestration of Carbon Dioxide

Many deep saline aquifers suitable for CO2 injection are located in mature, onshore sedimentary basins of North America. These basins have been subjected to more than a century of oil and gas exploration and production, as well as the more recent practice of deep waste disposal. This legacy of drilling has resulted in large numbers of wells, a significant fraction of which are abandoned. For example, the number of wells is approaching 400,000 in the Alberta Basin in Canada, while in Texas the number exceeds 1,000,000. Because the purpose of these wells is to allow for easy transfer of fluids from the deep subsurface to the land surface, they have the potential to serve as conduits along which injected CO2 could leak, especially if they are improperly completed, operated, or abandoned. To assess and understand different aspects of the flow and transport of injected CO2, we have analysed the governing equations for two-phase flow in porous media. In this paper we will show how analytical solutions to the flow problem, both well-known and new, can be applied to CO2 sequestration scenarios to give substantial insight into the order of magnitude of CO2 spread in the host aquifers, as well as the near well flow patterns around abandoned wells.