SAPRECO2 - SAlt PREcipitation during CO2 storage in carbonate rocks Research report

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169420" target="_blank" >RIV/00025798:_____/24:10169420 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

SAPRECO2 - SAlt PREcipitation during CO2 storage in carbonate rocks Research report

Original language description

The porosity and Klinkenberg corrected gas permeability of the plug measured before the start of the experiment with nitrogen at room temperature and 50 bar NCP was 10 % and 93 mD respectively. The effective porosity and permeability calculated based on geophysical measurements (well logging) directly in the borehole under reservoir conditions match the laboratory-acquired values well. The effective porosity (PHIEQ) is 8.9 % and the permeability (KABS) is estimated to be 23-29 mD (Opletal et al., 2022).The initial CO2 permeability at the start of the experiments was measured to be 61 mD at the reservoir pressure and temperature. Subsequently the CO2 was replaced with SFW and the brine measured permeability was 53 mD.The main part of the experiment consisted of injecting CO2 into the 100% brine saturated plug. The differential pressure fell very quickly for the first 1-2 pore volume (PV) injected. This was due to the production of brine from the plug. The viscosity of the brine was much larger than that of CO2. After the first 2 PV injected, the differential pressure fell gradually over many PV injected. This can be explained by the vaporization of water from the brine left in the plug.The water saturation calculated only from the brine production from the plug measured at the separator is given as well. The produced brine in the separator was only 23 % of brine initially in the plug. Brine was only produced during the first 1-2 PV and no further brine production was observed at the separator afterwards. This confirms that the differential pressure reduction (when no brine was produced) is due to vaporization of the water from the plug.Dry CO2 induced water vaporization led to precipitation of salts in the plug and hence subsequent reduction of the permeability and porosity of the plug. The properties measured after the experiments showed a reduction in the CO2 permeability from 61 mD to 41 mD and the nitrogen permeability and porosity at room conditions also showed significant reduction from 93 mD to 43 mD for the permeability and from 10 % to 7 % for the porosity.

Czech name

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Czech description

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Type

V_souhrn - Summary research report

CEP classification

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OECD FORD branch

10505 - Geology

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Number of pages

6

Place of publication

Brno

Publisher/client name

Česká geologická služba

Version

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