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Injection of CO2-saturated brine in geological reservoir: A way to enhanced storage safety
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. KTH Royal Institute of Technology. (Doctoral Program in Land and Water Resources Engineering)ORCID iD: 0000-0002-6871-8540
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.ORCID iD: 0000-0003-2726-6821
Universitat Politècnica de Catalunya, UPC-BarcelonaTech, 08034 Barcelona, Spain. (Hydrogeology Group, Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, UPC-BarcelonaTech, 08034 Barcelona, Spain)
Stockholm University, Sweden. (Department of Physical Geography, The Bolin Centre for Climate Research, Stockholm University, SE-10691 Stockholm, Sweden)
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Injection of free phase supercritical CO2 into deep geological reservoirs is associated with risk of considerable return flows towards the land surface due to the buoyancy of CO2, which is lighter than the resident brine in the reservoir. Such upward movements can be avoided if CO2 is injected in the dissolved phase (CO2aq). In this work, injection of CO2-saturated brine in a subsurface carbonate reservoir is modelled. Physical and geochemical interactions of injected low-pH CO2-saturated brine with the carbonate minerals (calcite, dolomite and siderite) are investigated in the reactive transport modelling. CO2-saturated brine, being low in pH, shows high reactivity with the reservoir minerals, resulting in a significant mineral dissolution and CO2 conversion in reactions. Over the injection period of 10 years, up to 16% of the injected CO2 is found consumed in geochemical reactions. Sorption included in the transport analysis resulted in additional quantities of CO2 mass stored. However, for the considered carbonate minerals, the consumption of injected CO2aq is found mainly in the form of ionic trapping.

Keyword [en]
Injection of CO2-saturated brine, geological storage, carbonate reservoir, carbonate mineral reactions, ionic trapping, enhanced storage safety
National Category
Mineral and Mine Engineering
Research subject
Applied and Computational Mathematics; Chemical Engineering; Chemistry; Civil and Architectural Engineering; Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-184624OAI: oai:DiVA.org:kth-184624DiVA: diva2:916395
Funder
StandUp
Note

This manuscript was submitted to the journal of International Journal of Greenhouse gas Control. The main funder for this study has been “Higher Education Commission (HEC) of Pakistan”. The study was also partly supported by Lars Erik Lundberg Scholarship Foundation, Sweden.

Available from: 2016-04-01 Created: 2016-04-01 Last updated: 2016-04-04Bibliographically approved
In thesis
1. REACTIVE TRANSPORT MODELLING OF DISSOLVED CO2 IN POROUS MEDIA: Injection into and leakage from geological reservoirs
Open this publication in new window or tab >>REACTIVE TRANSPORT MODELLING OF DISSOLVED CO2 IN POROUS MEDIA: Injection into and leakage from geological reservoirs
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The geological sequestration of carbon dioxide (CO2) is one of the options of controlling the greenhouse gas emissions. However, leakage of CO2 from the storage reservoir is a risk associated with geological sequestration. Over longer times, large-scale groundwater motion may cause leakage of dissolved CO2 (CO2aq).

The objectives of this thesis are twofold. First, the modelling study analyzes the leakage of CO2aq along the conducting pathways. Second, a relatively safer mode of geological storage is investigated wherein CO2aq is injected in a carbonate reservoir. A reactive transport model is developed that accounts for the coupled hydrological transport and the geochemical reactions of CO2aq in the porous media. The study provides a quantitative assessment of the impact of advection, dispersion, diffusion, sorption, geochemical reactions, temperature, and heat transport on the fate of leaking CO2aq.

The mass exchange between the conducting pathway and the rock matrix plays an important role in retention and reactions of leaking CO2aq. A significant retention of leaking CO2aq is caused by its mass stored in aqueous and adsorbed states and its consumption in reactions in the rock matrix along the leakage pathway. Advection causes a significant leakage of CO2aq directly from the reservoir through the matrix in comparison to the diffusion alone in the rock matrix and advection in a highly conducting, but thin fracture. Heat transport by leaking brine also plays an important role in geochemical interactions of leaking CO2aq

Injection of CO2aq is simulated for a carbonate reservoir. Injected CO2-saturated brine being reactive causes fast dissolution of carbonate minerals in the reservoir and fast conversion of CO2aq through considered geochemical reactions. Various parameters like dispersion, sorption, temperature, and minerals reaction kinetics are found to play important role in the consumption of CO2aq in reactions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. xii, 59 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2016-04
Keyword
CO2 geological storage and safety, leakage of brine saturated with dissolved CO2, reactive transport, fracture, advection, dispersion and diffusion, sorption, carbonate minerals kinetic reactions, calcite, dolomite, siderite, porosity, permeability, heat transport
National Category
Mineral and Mine Engineering
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-184204 (URN)978-91-7595-911-5 (ISBN)
Public defence
2016-04-20, F3, Lindstedstsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
StandUpSwedish Research Council, VR621-2007-4440
Note

Research Funders:

(i) Higher Education Commission (HEC) of Pakistan

(ii) Lars Erik Lundberg Scholarship Foundation, Sweden

Available from: 2016-04-04 Created: 2016-03-30 Last updated: 2016-05-02Bibliographically approved

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