Numerical Study of CO 2 Geological Storage in Saline Aquifers without the Risk of Leakage

Yuan-Heng Li, Chien-Hao Shen, Cheng-Yueh Wu and Bieng-Zih Hsieh
Additional contact information
Yuan-Heng Li: Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan
Chien-Hao Shen: Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan
Cheng-Yueh Wu: Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan
Bieng-Zih Hsieh: Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan

Energies, 2020, vol. 13, issue 20, 1-19

Abstract: The purpose of this study is to reduce the risk of leakage of CO 2 geological storage by injecting the dissolved CO 2 solution instead of the supercritical CO 2 injection. The reservoir simulation method is used in this study to evaluate the contributions of the different trapping mechanisms, and the safety index method is used to evaluate the risk of CO 2 leakage. The function of the dissolved CO 2 solution injection is performed by a case study of a deep saline aquifer. Two scenarios are designed in this study: the traditional supercritical CO 2 injection and the dissolved CO 2 solution injection. The contributions of different trapping mechanisms, plume migrations, and the risk of leakage are evaluated and compared. The simulation results show that the risk of leakage via a natural pathway can be decreased by the approach of injecting dissolved CO 2 solution instead of supercritical CO 2 . The amount of the CO 2 retained by the safe trapping mechanisms in the dissolved CO 2 solution injection scenario is greater than that in the supercritical CO 2 scenario. The process of CO 2 mineralization in the dissolved CO 2 solution injection scenario is also much faster than that in the supercritical CO 2 scenario. Changing the injection fluid from supercritical CO 2 to a dissolved CO 2 solution can significantly increase the safety of the CO 2 geological storage. The risk of CO 2 leakage from a reservoir can be eliminated because the injected CO 2 can be trapped totally by safe trapping mechanisms.

Keywords: mineralization mechanisms; dissolved CO 2 injection; storage safety (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/20/5259/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/20/5259/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:13:y:2020:i:20:p:5259-:d:425808

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().