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| Titel |
Design of a two-well field test to determine in-situ residual and dissolution trapping of CO2 in a deep saline aquifer |
| VerfasserIn |
F. Fagerlund, A. Niemi, J. Bensabat, V. Shtivelman |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065044
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| Zusammenfassung |
| CO2 trapping as immobile residual phase and by dissolution to brine are critical processes for CO2 storage security and reservoir capacity in many geological settings in consideration for geological CO2 storage. While laboratory and numerical modelling studies have provided valuable information on the topic, further field testing is critical to improve understanding of how the CO2 trapping will take place in-situ and to assess the relative importance of the different trapping mechanisms at field sites for geological storage. Given the challenge to measure fluid flow and trapping processes in kilometre-deep reservoirs with few boreholes and limited knowledge of the spatial distribution of geological parameters, the design of field tests that can accurately quantify the CO2 trapping is also challenging. Using modelling applied to the EU MUSTANG project’s field testing site at Heletz, Israel, this study investigates how a two-well dipole test configuration can be used to study migration and trapping of CO2 in-situ under influence of geological heterogeneity between two boreholes. A two-well dipole test sequence for quantifying both residual and dissolution trapping of CO2 in situ is presented. The test uses a relatively small amount of injected CO2 which is monitored by a combination of hydraulic, thermal and tracer measurement techniques. Hydraulic and thermal tests are shown to be sensitive to CO2 saturation and residual trapping. Furthermore we present a novel tracer technique, employing a non-water-soluble tracer in the CO2 phase, which is used to quantify the effective in-situ dissolution rate. Our modelling results show that the combination of these measurements in the two-well dipole configuration together with a mass balance of injected and abstracted fluids constitute an effective tool for characterization of in-situ trapping of geologically stored CO2 at the field scale. |
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