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Permeability and Strength of Cements Exposed to Supercritical CO2 for Varying Periods
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  • Journal title : The Journal of Engineering Geology
  • Volume 26, Issue 1,  2016, pp.117-128
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2016.1.117
 Title & Authors
Permeability and Strength of Cements Exposed to Supercritical CO2 for Varying Periods
Lee, Hikweon; Kim, Kideok; Kim, Taehee; Kim, Gyo-Won;
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Chemical reaction tests were performed to assess the properties of hardened specimens of cement pastes (KS-1 Portland and Class G) exposed to supercritical CO2 for 1, 10, and 100 days. After exposure, the samples` measured permeability and strength were compared with values measured for pristine samples. The pristine cements had permeabilities of 0.009~0.025 mD, which increased by one order of magnitude after 100 days of exposure (to 0.11~0.29 mD). The enhancement of permeability is attributed to the stress release experienced by the samples after removal from the pressure vessel after exposure. Despite its enhancement, the measured permeability mostly remained lower than the API (American Petroleum Institute) recommended maximum value of 0.2 mD. The degradation of the cement samples due to exposure to supercritical CO2 led to a layer of altered material advancing inwards from the sample edges. The Vickers hardness in the altered zone was much higher than that in the unaltered zone, possibly owing to the increase in density and the decrease in porosity due to the carbonation that occurred in the altered zone. Hardness close to the edge within the altered zone was found to have decreased significantly, which is attributed to the conversion of C-S-H into less-strong amorphous silica.
wellbore integrity;KS-1 ordinary Portland cement;Class G cement;permeability;strength;
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