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Title Experimental study of convective dissolution of carbon dioxide in porous media
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Publication Date
Date Accessioned
Degree MSin Engineering
Discipline/Department Petroleum Engineering
Degree Level masters
University/Publisher University of Texas – Austin
Abstract Geological carbon dioxide (CO₂) capture and storage in geological formations has the potential to reduce anthropogenic emissions. The viability of technology depends on the long-term security of the geological CO₂ storage. Dissolution of CO₂ into the brine, resulting in stable stratification, has been identified as the key to long-term storage security. The dissolution rate determined by convection in the brine is driven by the increase of brine density with CO₂ saturation. Here we present a new analog laboratory experiment system to characterize convective dissolution in homogeneous porous medium. By understanding the relationship between dissolution and the Rayleigh number in homogeneous porous media, we can evaluate if convective dissolution occurs in the field and, in turn, to estimate the security of geological CO₂ storage fields. The large experimental assembly will allow us to quantify the relationship between convective dynamics and the Rayleigh number of the system, which could be essential to trapping process at Bravo Dome. A series of pictures with high resolution are taken to show the existence and movement of fingers of analog fluid. Also, these pictures are processed, clearly showed the concentration of analog fluid, which is essential to analyze the convective dissolution in detail. We measured the reduction in the convective flux due to hydraulic dispersion effect compared to that in homogeneous media, to determine if convective dissolution is an important trapping process at Bravo Dome.
Subjects/Keywords CO₂ sequestration; CO₂ dissolution trapping; Multiphase flow; Porous media; Convection
Contributors DiCarlo, David Anthony, 1969- (advisor)
Language en
Country of Publication us
Record ID handle:2152/28295
Repository texas
Date Indexed 2020-10-15
Grantor The University of Texas at Austin
Note [] text; [department] Petroleum and Geosystems Engineering;

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…9 2.2.1 Overview ........................................................................................... 9 2.2.2 Trapping Mechanisms ..................................................................... 12 2.2.3 CO2 Convective Dissolution…

Trapping............................................. 15 2.3 Previous work .............................................................................................. 19 Chapter 3: Materials and Experimental Procedures…

…131 ix References…. .................................................................................................................. 133 x LIST OF FIGURES Figure 1.1 - Main trapping mechanisms for CO2 storage. Graph is modified from the…

…x28;Metz, Davidson, Coninck, Loos, & Meyer, 2005). There are four trapping mechanisms for CO2 storage, including structural & stratigraphic trapping, residual CO2 trapping, dissolution trapping and mineral trapping. Leakage potential is a serious…

…problem for CO2 storage we must consider. For example, once the cap rock is broke by activities like earthquakes, CO2 can leak from structural & stratigraphic trapping site and come back to the atmosphere or pollute drinking water at shallower depth due to…

…its mobility and positive buoyancy with respect to the brine, which is the scenario we must prevent. Figure 1.1 shows main trapping mechanisms for CO2 storage, relevant trapping contributions for each mechanism and storage security. Dissolution of CO2…

…flows upward continually to dissolve more CO2. The time scale for the dissolution trapping is estimated to be from hundred to thousand years. Therefore dissolution of the supercritical CO2 into the brine in saline aquifers is a very important mechanism…

…due to its high security and 2 long – term storage capacity. Figure 1.2 shows the CO2 –rich fingers migrating downward in the porous media. Figure 1.1 - Main trapping mechanisms for CO2 storage. Graph is modified from the documents by Metz. (…

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