COMPUTATIONAL METHODOLOGY TO ANALYZE THE EFFECT OF MASS TRANSFER RATE ON ATTENUATION OF LEAKED CARBON DIOXIDE IN SHALLOW AQUIFERS

Acta Polytechnica

Tissa H. Illangasekare¹  Jiří Mikyška²  Radek Fučík²  Jakub Solovský²  Michelle R. Plampin³  Hao Wu⁴ 

[1] Colorado School of Mines, Center for Experimental Study of Subsurface Environmental Processes, 1500 Illinois St., Golden, CO 80401, USA;Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Mathematics, Trojanova 13, 12000, Praha, Czech Republic;U.S. Geological Survey, Eastern Energy Resources Science Center, 12201 Sunrise Valley Drive, Reston, VA 20192, USA;Virginia Polytechnic Institute and State University, Department of Geosciences, 926 West Campus Drive, Blacksburg, VA 24061, USA;

关键词: compositional flow;    two–phase flow;    kinetic mass transfer;    gas exsolution;    gas dissolution;   

DOI  :  10.14311/AP.2021.61.0077

来源: DOAJ

【 摘 要 】

Exsolution and re-dissolution of CO2 gas within heterogeneous porous media are investigated using experimental data and mathematical modeling. In a set of bench-scale experiments, water saturated with CO2 under a given pressure is injected into a 2-D water-saturated porous media system, causing CO2 gas to exsolve and migrate upwards. A layer of fine sand mimicking a heterogeneity within a shallow aquifer is present in the tank to study accumulation and trapping of exsolved CO2. Then, clean water is injected into the system and the accumulated CO2 dissolves back into the flowing water. Simulated exsolution and dissolution mass transfer processes are studied using both nearequilibrium and kinetic approaches and compared to experimental data under conditions that do and do not include lateral background water flow. The mathematical model is based on the mixed hybrid finite element method that allows for accurate simulation of both advection- and diffusion- dominated processes.

【 授权许可】

Unknown