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Title: Pore scale study of multiphase multicomponent reactive transport during CO 2 dissolution trapping

Abstract

Solubility trapping is crucial for permanent CO 2 sequestration in deep saline aquifers. For the first time, a pore-scale numerical method is developed to investigate coupled scCO 2-water two-phase flow, multicomponent (CO 2(aq), H +, HCO 3 , CO 3 2 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 CO 2(aq) concentration, scCO 2 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 CO 2 solubility trapping processes, and also allow to quantitatively predict some important empirical relationships, such as saturation-interfacial surface area, for continuum models.

Authors:
 [1];  [1]; ORCiD logo [2];  [1]
  1. Xi'an Jiaotong Univ., Shaanxi (China)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1435529
Report Number(s):
LA-UR-17-30476
Journal ID: ISSN 0309-1708
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advances in Water Resources
Additional Journal Information:
Journal Name: Advances in Water Resources; Journal ID: ISSN 0309-1708
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Earth Sciences

Citation Formats

Chen, Li, Wang, Mengyi, Kang, Qinjun, and Tao, Wenquan. Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping. United States: N. p., 2018. Web. doi:10.1016/j.advwatres.2018.02.018.
Chen, Li, Wang, Mengyi, Kang, Qinjun, & Tao, Wenquan. Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping. United States. doi:10.1016/j.advwatres.2018.02.018.
Chen, Li, Wang, Mengyi, Kang, Qinjun, and Tao, Wenquan. Thu . "Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping". United States. doi:10.1016/j.advwatres.2018.02.018.
@article{osti_1435529,
title = {Pore scale study of multiphase multicomponent reactive transport during CO2 dissolution trapping},
author = {Chen, Li and Wang, Mengyi and Kang, Qinjun and Tao, Wenquan},
abstractNote = {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.},
doi = {10.1016/j.advwatres.2018.02.018},
journal = {Advances in Water Resources},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 26 00:00:00 EDT 2018},
month = {Thu Apr 26 00:00:00 EDT 2018}
}

Journal Article:
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