Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping
Journal Article
·
· Advances in Water Resources
- Xi'an Jiaotong Univ., Shaanxi (China)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Solubility trapping is crucial for permanent CO2 sequestration in deep saline aquifers. For the first time, a pore-scale numerical method is developed to investigate coupled scCO2-water two-phase flow, multicomponent (CO2(aq), H+, HCO3–, CO32– and OH–) mass transport, heterogeneous interfacial dissolution reaction, and homogeneous dissociation reactions. Pore-scale details of evolutions of multiphase distributions and concentration fields are presented and discussed. Time evolutions of several variables including averaged CO2(aq) concentration, scCO2 saturation, and pH value are analyzed. Specific interfacial length, an important variable which cannot be determined but is required by continuum models, is investigated in detail. Mass transport coefficient or efficient dissolution rate is also evaluated. The pore-scale results show strong non-equilibrium characteristics during solubility trapping due to non-uniform distributions of multiphase as well as slow mass transport process. Complicated coupling mechanisms between multiphase flow, mass transport and chemical reactions are also revealed. Lastly, effects of wettability are also studied. The pore-scale studies provide deep understanding of non-linear non-equilibrium multiple physicochemical processes during CO2 solubility trapping processes, and also allow to quantitatively predict some important empirical relationships, such as saturation-interfacial surface area, for continuum models.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- LDRD; USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1435529
- Report Number(s):
- LA-UR--17-30476
- Journal Information:
- Advances in Water Resources, Journal Name: Advances in Water Resources Vol. 116; ISSN 0309-1708
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Pore‐Scale Investigation of Methane Hydrate Dissociation Using the Lattice Boltzmann Method
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journal | November 2019 |
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