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Analysis of alternative push-pull-test-designs for determining in situ residual trapping of carbon dioxide
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
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2014 (English)In: International Journal of Greenhouse Gas Control, ISSN 1750-5836, E-ISSN 1878-0148, Vol. 27, p. 155-168Article in journal (Refereed) Published
Abstract [en]

Carbon dioxide storage in deep saline aquifers is a promising technique to reduce direct emissions of greenhouse gas to the atmosphere. To ensure safe storage the in situ trapping mechanisms, residual trapping being one of them, need to be characterized. This study aims to compare three alternative single-well carbon dioxide push-pull test sequences for their ability to quantify residual gas trapping. The three tests are based on the proposed test sequence by Zhang et al. (2011) for estimating residual gas saturation. A new alternative way to create residual gas conditions in situ incorporating withdrawal and a novel indicator-tracer approach has been investigated. Further the value of additional pressure measurements from a nearby passive observation well was evaluated. The iTOUGH2 simulator with the EOS7C module was used for sensitivity analysis and parameter estimation. Results show that the indicator-tracer approach could be used to create residual conditions without increasing estimation uncertainty of S-gr. Additional pressure measurements from a passive observation well would reduce the uncertainty in the S-gr estimate. The findings of the study can be used to develop field experiments for site characterization.

Place, publisher, year, edition, pages
2014. Vol. 27, p. 155-168
Keywords [en]
CO2, CCS, Site characterization, Field test, Residual saturation, Single-well test
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:uu:diva-232013DOI: 10.1016/j.ijggc.2014.05.008ISI: 000340319600012OAI: oai:DiVA.org:uu-232013DiVA, id: diva2:746407
Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2018-03-03Bibliographically approved
In thesis
1. Modeling of geohydrological processes in geological CO2 storage – with focus on residual trapping
Open this publication in new window or tab >>Modeling of geohydrological processes in geological CO2 storage – with focus on residual trapping
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Geological storage of carbon dioxide (CO2) in deep saline aquifers is one approach to mitigate release from large point sources to the atmosphere. Understanding of in-situ processes providing trapping is important to the development of realistic models and the planning of future storage projects. This thesis covers both field- and pore-scale numerical modeling studies of such geohydrological processes, with focus on residual trapping. The setting is a CO2-injection experiment at the Heletz test site, conducted within the frame of the EU FP7 MUSTANG and TRUST projects.

The objectives of the thesis are to develop and analyze alternative experimental characterization test sequences for determining in-situ residual CO2 saturation (Sgr), as well as to analyze the impact of the injection strategy on trapping, the effect of model assumptions (coupled wellbore-reservoir flow, geological heterogeneity, trapping model) on the predicted trapping, and to develop a pore-network model (PNM) for simulating and analyzing pore-scale mechanisms.

The results include a comparison of alternative characterization test sequences for estimating Sgr. The estimates were retrieved through parameter estimation. The effect on the estimate of including various data sets was determined. A new method, using withdrawal and an indicator-tracer, for obtaining a residual zone in-situ was also introduced.

Simulations were made of the CO2 partitioning between layers in a multi-layered formation, and parameters influencing this were identified. The results showed the importance of accounting for coupled wellbore-reservoir flow in simulations of such scenarios.

Simulations also showed that adding chase-fluid stages after a conventional CO2 injection enhances the (residual and dissolution) trapping. Including geological heterogeneity generally decreased the estimated trapping. The choice of trapping model may largely effect the quantity of the predicted residual trapping (although most of them produced similar results). The use of an appropriate trapping model and description of geological heterogeneity for a site when simulating CO2 sequestration is vital, as different assumptions may give significant discrepancies in predicted trapping.

The result also includes a PNM code, for multiphase quasi-static flow and trapping in porous materials. It was used to investigate trapping and obtain an estimated trapping (IR) curve for Heletz sandstone.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. p. 96
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1540
Keywords
capillary trapping, CCS, characterization test, CO2, injection design, pore-network model
National Category
Earth and Related Environmental Sciences
Research subject
Hydrology
Identifiers
urn:nbn:se:uu:diva-327994 (URN)978-91-513-0031-3 (ISBN)
Public defence
2017-09-29, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2017-09-06 Created: 2017-08-15 Last updated: 2017-09-08
2. Residual and Solubility trapping during Geological CO2 storage: Numerical and Experimental studies
Open this publication in new window or tab >>Residual and Solubility trapping during Geological CO2 storage: Numerical and Experimental studies
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Geological storage of carbon dioxide (CO2) in deep saline aquifers mitigates atmospheric release of greenhouse gases. To estimate storage capacity and evaluate storage safety, knowledge of the trapping mechanisms that retain CO2 within geological formations, and the factors affecting these is fundamental. The objective of this thesis is to study residual and solubility trapping mechanisms (the latter enhanced by density-driven convective mixing), specifically in regard to their dependency on aquifer characteristics, and to investigate and develop methods for quantification of CO2 trapping in the field. The work includes implementation of existing numerical simulators and inverse modeling, as well as the development of new models and experimental methods for the study and quantification of CO2 trapping.

A comparison of well-test designs in regard to their abilities to estimate the in-situ residual gas saturation (that determines the residual trapping of CO2) is presented, as well as a novel indicator-tracer approach to obtain residual gas saturation conditions in a formation. The results can aid in the planning of well-tests for estimation of trapping potential during site characterization.

Pore-network modeling simulations were conducted to study the effects of co-contaminant sulphur dioxide and formation thermodynamic and salinity conditions on residual CO2 trapping.

Furthermore, an analysis tool was developed and used to study the prerequisites for density-driven instability and convective mixing over broad geological storage conditions, including the relative influences of formation characteristics on factors controlling the convective process. The results show which conditions favour or disfavour residual and solubility trapping, knowledge useful for long-term predictions of the fate of injected CO2, and safety assessments during site selection.

An optical experimental method, the refractive-light-transmission (RLT) technique, and an analogue system design were developed for studying density-driven flow in porous media. The method exploits changes in light refraction to visualize convective flow, and incorporates a calibration procedure and an image post-processing scheme that enable quantification of solute concentration, density and viscosity within porous media. The experimental setup was used to study the dynamics of convective mixing, and to derive scaling laws for the onset time and mass flux of convection.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 81
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1640
Keywords
capillary trapping, CCS, convective flow, CO2, light transmission, SO2, well test
National Category
Earth and Related Environmental Sciences
Research subject
Hydrology
Identifiers
urn:nbn:se:uu:diva-343505 (URN)978-91-513-0257-7 (ISBN)
Public defence
2018-04-27, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2018-03-28 Created: 2018-03-03 Last updated: 2018-04-24

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Rasmusson, KristinaRasmusson, MariaFagerlund, FritjofNiemi, Auli

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