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- W3138958559 abstract "CO2 injection speed (FR) is one of important factor to control the CO2 flow mechanism in sandstone. In this study, we conducted two CO2 injection experiments into different types of sandstone with changing FR under reservoir P-T conditions (40°C and 10 MPa). This study used high-permeable Berea-sand stone (10 mD) and ultra-low permeable-Ainoura sandstone (0.01mD) for CO2 injection tests and estimated CO2 saturation (SCO2) and differential pressure (DP) between up- and down-stream of sandstones. Injected CO2 penetrates water-saturated sample and replaced resident brine in pore-spaces. Increasing FR, CO2 flows the pathway, which is formed by former injected CO2 with replacing brine in pore with increasing SCO2 and DP. In this study, these parameters showed different changes between Berea and Ainoura with increasing FR. In case of Berea, they showed small changes of both of vales under lower FR and rapidly increased up to around 50% for SCO2 and 0.5MPa for DP at the highest FR. While, these parameters of Ainoura indicated large values at lowest FR, over 20% for SCO2 and 0.3MPa for DP and reached near 60% for SCO2 and 0.9 MPa for DP at high FR. We investigated electrical resistivity and SCO2 relation based on Archie’s law. RI of both samples illustrated near-linear relation between 90 and 50% of SCO2. Over 50% of SCO2, RI of Ainoura sandstone departed from Archie’s model. It is considered that the difference of RI-Sw relations between Berea and Ainoura sandstone is caused by differences of rock texture. These experimental campaigns clearly pointed out the importance of FR and absolute permeability (and pore structure) to predict CO2 flow mechanisms in porous sandstone. It is also indicated that electrical properties (resitivity and RI) have large potential to estimate SCO2 and to elucidate the CO2 flow in the sandstone sample." @default.
- W3138958559 created "2021-03-29" @default.
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- W3138958559 date "2019-01-01" @default.
- W3138958559 modified "2023-10-17" @default.
- W3138958559 title "Impact of CO2 Injection Speed on CO2 Behavior in Two Types of Sandstone" @default.
- W3138958559 doi "https://doi.org/10.2139/ssrn.3365743" @default.
- W3138958559 hasPublicationYear "2019" @default.
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