Prediction of carbon dioxide dissolution in bulk water under isothermal pressure decay at different boundary conditions

Gholami, Yasin; Azin, Reza; Fatehi, Rouhollah; Osfouri, Shahriar; Bahadori, Alireza

doi:10.1016/j.molliq.2014.11.031

Cited by 24 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of slow diffusion into the scCO 2 -free low-permeability zones, scCO 2 dissolution and mass transfer in heterogeneous aquifers may have a significantly smaller role in solubility trapping than in homogeneous formations. The non-equilibrium scCO 2 dissolution at the boundaries between scCO 2 plumes and underlying brine regions may slow down the onset of convective mass transfer and reduce the stable mass-transfer rate, which has been numerically investigated (Gholami et al, 2015). The observed spatial variability in water pH may have some effects on chemical interactions in CO 2 -water-mineral systems.…”

Section: Discussionmentioning

confidence: 99%

Pore-scale supercritical CO2 dissolution and mass transfer under drainage conditions

Chang

Zhou

Oostrom

et al. 2017

Advances in Water Resources

View full text Add to dashboard Cite

Abstract:Recently, both core-and pore-scale imbibition experiments have shown nonequilibrium dissolution of supercritical CO 2 (scCO 2 ) and a prolonged depletion of residual scCO 2 . In this study, pore-scale scCO 2 dissolution and mass transfer under drainage conditions were investigated using a two-dimensional heterogeneous micromodel and a novel fluorescent water dye with a sensitive pH range between 3.7 and 6.5. Drainage experiments were conducted at 9 MPa and 40 °C by injecting scCO 2 into the sandstone-analogue pore network initially saturated by water without dissolved CO 2 (dsCO 2 ). During the experiments, time-lapse images of dye intensity, reflecting water pH, were obtained. These images show non-uniform pH in individual pores and pore clusters, with average pH levels gradually decreasing with time.Further analysis on selected pores and pore clusters shows that (1) rate-limited mass transfer prevails with slowly decreasing pH over time when the scCO 2 -water interface area is low with respect to the volume of water-filled pores and pore clusters, (2) fast scCO 2 dissolution and phase equilibrium occurs when scCO 2 bubbles invade into water-filled pores, significantly enhancing the area-to-volume ratio, and (3) a transition from rate-limited to diffusion-limited mass transfer occurs in a single pore when a medium area-to-volume ratio is prevalent. The analysis also shows that two fundamental processes -scCO 2 dissolution at phase interfaces and diffusion of dsCO 2 at the pore scale (10-100 µm), observed after scCO 2 bubble invasion into water-filled pores without pore throat constraints, are relatively fast. The overall slow dissolution of scCO 2 in the millimeter-scale micromodel can be attributed to the small area-to-volume ratios that represent pore-throat configurations and characteristics of phase interfaces. This finding is applicable for the behavior of dissolution at pore, core, and field scales when water-filled pores and pore clusters of varying size are surrounded by scCO 2 at narrow pore throats.

show abstract

Section: Discussionmentioning

confidence: 99%

Pore-scale supercritical CO2 dissolution and mass transfer under drainage conditions

Chang

Zhou

Oostrom

et al. 2017

Advances in Water Resources

View full text Add to dashboard Cite

show abstract

“…The set of partial differential equations (PDE) along with their initial and boundary conditions were solved using finite element method (FEM) described in [50]. The modeling was based on the experimental method of pressure decay to suggest a scaled procedure for determining diffusion coefficient using dimensions of a regular PVT cell.…”

Section: Resultsmentioning

confidence: 99%

“…From the mass balance and the basis that injected gas is dissolved into liquid phase, a linear relationship between pressure and concentration can be deduced based on the real gas law [50]:…”

Section: Governing Equations and Assumptionsmentioning

confidence: 99%

“…At gas/liquid interface different boundary conditions can be applied. In bulk water, the rate of gas dissolution should be regulated with the mass transfer coefficient used in a Robin type non-equilibrium boundary condition (BC) at the interface [50]. In porous media, the equilibrium BC satisfies mass transfer rate since the dissolution rate is limited.…”

Section: Governing Equations and Assumptionsmentioning

confidence: 99%

“…This convective behavior can disrupt the whole pressure time data. The dominance of convection for CO 2 dissolution in bulk water is addressed in our previous work [50]. Consequently, application of the prescribed inverse methods to find diffusivity from the entire pressure-time data leads to significant errors.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Suggesting a numerical pressure-decay method for determining CO2 diffusion coefficient in water

Gholami

Azin

Fatehi

et al. 2015

Journal of Molecular Liquids

Self Cite

View full text Add to dashboard Cite

Refractive‐Light‐Transmission Technique Applied to Density‐Driven Convective Mixing in Porous Media With Implications for Geological CO₂ Storage

Rasmusson

Fagerlund

Rasmusson

et al. 2017

Water Resources Research

View full text Add to dashboard Cite

Density‐driven convection has been identified to accelerate the rate of CO2 solubility trapping during geological CO2 storage in deep saline aquifers. In this paper, we present an experimental method using the refractive properties of fluids (their impact on light transmission), and an analogous system design, which enables the study of transport mechanisms in saturated porous media. The method is used to investigate solutally induced density‐driven convective mixing under conditions relevant to geological CO2 storage. The analogous system design allows us by choice of initial solute concentration and bead size to duplicate a wide range of conditions ( Ra‐values), making it possible to study the convective process in general, and as a laboratory analogue for systems found in the field. We show that the method accurately determines the solute concentration in the system with high spatial and temporal resolution. The onset time of convection ( tc), mass flux ( F), and flow dynamics are quantified and compared with experimental and numerical findings in the literature. Our data yield a scaling law for tc which gives new insight into its dependence on Ra, indicating tc to be more sensitive to large Ra than previously thought. Furthermore, our data show and explain why F is described equally well by a Ra‐dependent or a Ra‐independent scaling law. These findings improve the understanding of the physical process of convective mixing in saturated porous media in general and help to assess the CO2 solubility trapping rate under certain field conditions.

show abstract

Prediction of carbon dioxide dissolution in bulk water under isothermal pressure decay at different boundary conditions

Cited by 24 publications

References 27 publications

Pore-scale supercritical CO2 dissolution and mass transfer under drainage conditions

Pore-scale supercritical CO2 dissolution and mass transfer under drainage conditions

Suggesting a numerical pressure-decay method for determining CO2 diffusion coefficient in water

Refractive‐Light‐Transmission Technique Applied to Density‐Driven Convective Mixing in Porous Media With Implications for Geological CO₂ Storage

Contact Info

Product

Resources

About

Prediction of carbon dioxide dissolution in bulk water under isothermal pressure decay at different boundary conditions

Cited by 24 publications

References 27 publications

Pore-scale supercritical CO2 dissolution and mass transfer under drainage conditions

Pore-scale supercritical CO2 dissolution and mass transfer under drainage conditions

Suggesting a numerical pressure-decay method for determining CO2 diffusion coefficient in water

Refractive‐Light‐Transmission Technique Applied to Density‐Driven Convective Mixing in Porous Media With Implications for Geological CO2 Storage

Contact Info

Product

Resources

About

Refractive‐Light‐Transmission Technique Applied to Density‐Driven Convective Mixing in Porous Media With Implications for Geological CO₂ Storage