Darcy Lecture Series in Groundwater ScienceExport this event to calendar

Monday, March 17, 2014 — 2:00 PM EDT

The Department of Earth and Environmental Sciences is hosting this lecture in DC 1304:

Optimizing Capillary Trapping as a Carbon Dioxide Mitigation Strategy: Pore-Scale Findings in Support of Larger-Scale Implementation

Dr. Dorthe WildenschildBy Dr. Dorthe Wildenschild, Associate Professor in Chemical, Biological, and Environmental Engineering at Oregon State University.

Dr. Wildenshchild is this year's Darcy lecturer for the National Groundwater Association.

Abstract:

Discover how x-ray microtomography is being studied for possible use as a technique to optimize capillary trapping of carbon dioxide in this presentation. Capillary trapping is a mechanism supporting carbon capture and storage (CCS), which is being considered as a mitigation strategy for emissions from concentrated sources such as coal-fired power plants.

CCS relies on geologic sequestration of captured carbon dioxide. Of concern in this process is the leakage of carbon dioxide back to the atmosphere, either acute or slower longterm escape, as well as related acidification of groundwater resources along the migration path.
 

Initial work using x-ray microtomography has focused on proxy fluid-based systems and experiments carried out at ambient conditions. As the interfacial tension, viscosity, and carbon dioxide injection (as well as subsequent brine flood injection) rates are varied, trends have been observed with the type of porous medium (unconsolidated vs. consolidated), varying wetting and nonwetting phase viscosity, and flow rates. The latter in particular has been investigated for its effect on morphology and connectivity of the trapped nonwetting phase (i.e., the supercritical carbon dioxide).

 

Results so far indicate that carbon dioxide injection can be manipulated to facilitate optimal trapping of residual carbon dioxide, both in terms of amount and with respect to size/ connectivity characteristics that may favorably support subsequent trapping reactions (e.g., dissolution and mineral formation).

 

Location 
DC - William G. Davis Computer Research Centre
1304
200 University Avenue West

Waterloo, ON N2L 3G1
Canada

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