Non-constant Diffusion Behavior for CO2 Diffusion into Brine: Influence of Density-Driven Convection

Zhao, Renbao; Xu, Mengfan; Yang, Jiaolong; Fu, Joseph Y; Heng, Minghao; Yue, Xiang-an

doi:10.1007/s10953-018-0818-9

Cited by 11 publications

(8 citation statements)

References 24 publications

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“…The ExpDec2 model can be applied to analyze the data from constant-pressure experiments also. We calculate the diffusion coefficient by fitting pressure-decay data in Figure 3 with this model 55,56 where k are the coefficients of Zhao’s fitting formula 56 obtained by fitting pressure-decay data.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Study on the Density-Driven Carbon Dioxide Convective Diffusion in Formation Water at Reservoir Conditions

Tang

Wang

et al. 2019

ACS Omega

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Density-driven convection, which can accelerate the dissolution rate of carbon dioxide (CO 2 ) in resident brine, is critical for the long-term fate of the injected CO 2 permanence and security of CO 2 geological storage. Visualization experiments and pressure–volume–temperature (PVT) testing were conducted to investigate the influence from gravitational convection. For investigate gravitational instabilities and convective diffusion, we designed a Hele-Shaw cell rated to 70 MPa and Rayleigh number of 346 to conduct visualization experiments with the micro-schlieren technique. The average diffusion coefficient and time-dependent values were measured in the PVT experiments. We also calculated the convection parameters, including Rayleigh number and critical onset time, with a series of PVT testing at the temperature ranging 293.15–423.15 K and pressure ranging 14–24 MPa by using the constant-pressure method. Through visualization experiments, we observed convective currents triggered by the density gradient in the gas–liquid interface, which noticeably enhanced the CO 2 dissolution rate. The PVT testing confirmed that the diffusion coefficient increased sharply under the influence of the gravitational convection at the early stage and then decreased toward the average diffusion coefficient with time. The PVT testing also demonstrated the Rayleigh number increasing with temperature or pressure increasing under the reservoir conditions. The gravitational convection will be more likely to occur and more rapid with a greater pressure or higher temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Zrtmentioning

confidence: 99%

Experimental Study on the Density-Driven Carbon Dioxide Convective Diffusion in Formation Water at Reservoir Conditions

Tang

Wang

et al. 2019

ACS Omega

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“…Moreover, in the regimes where convection is contributing to the mass transport, apparent diffusive behavior is observed, albeit with a much higher effective diffusion coefficient. Depending on the experimental conditions, this effective diffusion coefficient can be several orders of magnitude bigger in comparison to the expected diffusive counterpart under similar experimental conditions [20][21][22][23][24]. However, little explanation has been given as to what drives the different observed regimes, the transitions between the regimes and why the system still appears to behave in a diffusive manner.…”

Section: Introductionmentioning

confidence: 95%

Diffusive and convective dissolution of carbon dioxide in a vertical cylindrical cell

Faasen,

Sepahi,

Krug

et al. 2023

Phys. Rev. Fluids

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“…11 Table 1 provides a comprehensive overview of studies on diffusion coefficients with a focus on CO 2 diffusion in brine under low-pressure conditions. Zhao et al 12 measured the diffusion coefficient of CO 2 in brine extracted from the Instow formation at a temperature of 300.15K and an initial pressure of 1.786 MPa. Wang et al 13 determined diffusion coefficients ranging from 2.9 to 4.8 × 10 −9 m 2 s −1 for CO 2 in 0.25 mol L −1 sodium chloride solution from five diffusion and dissolution experiments.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurements of the Diffusion Coefficient and Effective Diffusion Coefficient of CO₂–Brine under Offshore CO₂ Storage Conditions

Zhang,

Geng,

Chen

et al. 2023

Energy Fuels

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Non-constant Diffusion Behavior for CO2 Diffusion into Brine: Influence of Density-Driven Convection

Cited by 11 publications

References 24 publications

Experimental Study on the Density-Driven Carbon Dioxide Convective Diffusion in Formation Water at Reservoir Conditions

Experimental Study on the Density-Driven Carbon Dioxide Convective Diffusion in Formation Water at Reservoir Conditions

Diffusive and convective dissolution of carbon dioxide in a vertical cylindrical cell

Experimental Measurements of the Diffusion Coefficient and Effective Diffusion Coefficient of CO₂–Brine under Offshore CO₂ Storage Conditions

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Non-constant Diffusion Behavior for CO2 Diffusion into Brine: Influence of Density-Driven Convection

Cited by 11 publications

References 24 publications

Experimental Study on the Density-Driven Carbon Dioxide Convective Diffusion in Formation Water at Reservoir Conditions

Experimental Study on the Density-Driven Carbon Dioxide Convective Diffusion in Formation Water at Reservoir Conditions

Diffusive and convective dissolution of carbon dioxide in a vertical cylindrical cell

Experimental Measurements of the Diffusion Coefficient and Effective Diffusion Coefficient of CO2–Brine under Offshore CO2 Storage Conditions

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Product

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Experimental Measurements of the Diffusion Coefficient and Effective Diffusion Coefficient of CO₂–Brine under Offshore CO₂ Storage Conditions