A novel methodology for measurement of the diffusion coefficient between CO2 and oil based on quantification of the oil droplet swelling behavior

Ocean already absorbed almost a third of global CO 2 emissions and offers huge CO 2 storage potential for widely deployed CCUS projects. Injecting and dispersing CO 2 in deep seawater is regarded as a promising method for accelerating the ocean sequestration process. The diffusion coefficient of CO 2 into deep seawater is of great value for determining the storage capacity. However, the characteristics of CO 2 diffusing into deep seawater are rarely studied. In this study, the diffusion coefficients of liquid CO 2 and seawater were measured using the dynamic pendant droplet volume analysis (DPDVA) method under 5−20 °C temperature, 6−20 MPa pressure and 3−4 wt % salinity. The results indicate that the diffusion coefficient increases with temperature and pressure and decreases with salinity. A total of 180 data points were obtained in this study, of which 147 were deemed valid, with an experimental error of less than 6%. The range of diffusion coefficients was found to be 3.53 × 10 −10 −7.36 × 10 −10 m 2 /s. This study is expected to fill the gap in the field of diffusion coefficient studies between liquid CO 2 and brine and support the assessment of CO 2 ocean storage capacity.

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A Comparative Study on the Oil Recovery Performance of the Co2 and N2 Huff-N-Puff Processes in Low Permeability Cores

Jiang

Shu

et al. 2023

Special Topics Rev Porous Media

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The gas huff-n-puff process has been widely employed in low permeability reservoir development practices. At present, the understanding of synergistic effects of different injection fluids and rock permeability is still limited and is worthy of in-depth investigation. Therefore, laboratory studies on oil recovery performance of supercritical CO2 (scCO2) and N2 huff-n-puff processes in ultra-low (< 0.5 mD), extra-low (0.5-1 mD), and average-low permeability (1-10 mD) core samples were systematically investigated. More effective cycles could be achieved in the CO2 huff-n-puff process than in the N2 process. The CO2 huff-n-puff operation could produce 29.9% oil in the ultralow permeability core, which is obviously higher than 20.2% for N2. With increasing core permeability, the oil recovery ratio for both the scCO2 and N2 huff-n-puff processes increases as well. Laboratory results show oil recovery ratios of 33.1% and 47.3% for the scCO2 process in 0.5 mD and 10 mD cores and 36.3% and 49.1% for the N2 process in 0.5 mD and 9.5 mD cores, respectively. Although the oil recovery rates for the N2 and CO2 huff-n-puff processes are close in the 0.5 mD and 10 mD cores, the effective oil extraction pressure for the scCO2 puff process is found to be 5~10 MPa, which is much higher than 0~2 MPa for the N2 puff process. The study's findings can help provide a better understanding of the oil extraction behaviors in the huff-n-puff process with different injection fluids as well as in different low permeability cores.

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A novel methodology for measurement of the diffusion coefficient between CO2 and oil based on quantification of the oil droplet swelling behavior

Cited by 5 publications

References 59 publications

Determination of the minimum miscibility pressures of CO2 and multicomponent oil system with a novel diffusion coefficient fit line intersection methodology

Determination of the minimum miscibility pressures of CO2 and multicomponent oil system with a novel diffusion coefficient fit line intersection methodology

Diffusivity Analysis of Liquid CO₂ and Saltwater under Deep Sea Conditions with the Dynamic Pendant Droplet Volume Analysis Method

A Comparative Study on the Oil Recovery Performance of the Co2 and N2 Huff-N-Puff Processes in Low Permeability Cores

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A novel methodology for measurement of the diffusion coefficient between CO2 and oil based on quantification of the oil droplet swelling behavior

Cited by 5 publications

References 59 publications

Determination of the minimum miscibility pressures of CO2 and multicomponent oil system with a novel diffusion coefficient fit line intersection methodology

Determination of the minimum miscibility pressures of CO2 and multicomponent oil system with a novel diffusion coefficient fit line intersection methodology

Diffusivity Analysis of Liquid CO2 and Saltwater under Deep Sea Conditions with the Dynamic Pendant Droplet Volume Analysis Method

A Comparative Study on the Oil Recovery Performance of the Co2 and N2 Huff-N-Puff Processes in Low Permeability Cores

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Product

Resources

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Diffusivity Analysis of Liquid CO₂ and Saltwater under Deep Sea Conditions with the Dynamic Pendant Droplet Volume Analysis Method