Speaker
Description
Reactive flow interactions in porous media are of great relevance in carbonate acidizing operations and in the geological storage of CO2 and hydrogen. The literature presents advances in understanding certain parameters on the core scale; however, there are still new challenges on the pore scale that can aid in comprehending the phenomenon of acidification. In addition, new discoveries regarding the evolution of the reactive process enhance the modeling of geological storage applications. Therefore, the objective of this work is to present the temporal evolution of the available rock surface area during reactive flow in porous media. The study was carried out on limestone and silurian dolomite rock samples from Indiana with dimensions of 2.5×2.5 mm in diameter and length, respectively, and 0.1 M HCl was used as the acid agent in reactive flow experiments. The analyses were performed at the MOGNO beamline of the Brazilian Synchrotron Light Laboratory, where a fluid flow cell was developed to allow time-resolved image acquisition during fluid flow in the sample. The MOGNO beamline X-ray microtomography technique, which utilizes synchrotron light as an energy source, was used to visualize the interior of the sample. The injection of acid was performed at a flow rate of 10 μL/min for 1 hour, during which 7 scans were acquired with a resolution of 1.2 μm. Our findings reveal the dynamic temporal evolution of the surface area parameters available for reaction and porosity during the reactive flow in each sample at the pore scale. The evolution of these parameters is more evident in the Indiana Limestone sample as a result of the faster reaction rate with this type of mineralogy. In conclusion, these
findings contribute to advance the understanding of reactive processes in porous media and provide data to improve models for geological storage applications.
| Country | Brazil |
|---|---|
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