Qualitative and quantitative experimental study of convective mixing process during storage of CO 2  in homogeneous saline aquifers

Taheri, Amir; Lindeberg, Erik; Torsæter, Ole; Wessel-Berg, Dag

doi:10.1016/j.ijggc.2017.08.023

Cited by 16 publications

(19 citation statements)

References 37 publications

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“…Typical experimental methods for studying miscible density-driven convection include pressure-volume-temperature (PVT) cells (Moghaddam et al, 2012;Mojtaba et al, 2014;Newell et al, 2018;Shi et al, 2018) and Hele-Shaw cells (Kneafsey & Pruess, 2010;Neufeld et al, 2010;Taheri et al, 2017). PVT cells allow for assessment of CO 2 dissolution fluxes by measuring the pressure decay.…”

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confidence: 99%

A Novel Experimental Study on Density‐Driven Instability and Convective Dissolution in Porous Media

Guo

Sun

Zhao

et al. 2021

Geophysical Research Letters

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Geological carbon dioxide (CO2) sequestration (GCS) in deep saline aquifers is a promising solution to mitigate the impact of anthropogenic CO2 emissions on global climate change. CO2 dissolved in formation water increases the solution density and can lead to miscible density‐driven downward convection, which significantly accelerates the dissolution trapping of injected CO2. Experimental studies on miscible density‐driven convection have been limited. In the laboratory, we found an empirical linear correlation between reflected green light intensity and solute concentration, which enabled in situ measurements of solute concentrations in the spatial and temporal domains and consequently the mass flux across the top boundary of the porous medium. Using the novel experimental techniques, we determined the critical Rayleigh‐Darcy number and critical time scales for the onset of density‐driven instability and convective dissolution. This is the first study to determine these critical system parameters using laboratory experiments.

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confidence: 99%

A Novel Experimental Study on Density‐Driven Instability and Convective Dissolution in Porous Media

Guo

Sun

Zhao

et al. 2021

Geophysical Research Letters

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“…After calculating the cumulative concentration of dissolved CO 2 , the cumulative mass of dissolved CO 2 is calculated. Fick’s second law and the following equation, presented by Amir Taheri et al [ 55 ], are used to calculate the dissolved CO 2 mass of diffusion dissolution:

…”

Section: Resultsmentioning

confidence: 99%

New Spectrophotometric Method for Quantitative Characterization of Density-Driven Convective Instability

et al. 2021

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CO2 convective dissolution has been regarded as one of the fundamental mechanisms to accelerate the mass transfer of CO2 into brine. We present a new spectrophotometric method to characterize the convective instability and measure the dissolved CO2 mass, which enables the real-time quantitative visualization of CO2/brine transport mechanisms. Successive images were captured to identify the finger development regimes, and the convection morphologies were analyzed by the fingers length and affected area. CO2 solubility was experimentally studied, and the results are in agreement with the theoretical calculations. CO2 mass transfer flux was investigated as the Sherwood number changed. The increase in salinity and temperature has a negative effect on CO2 dissolution; here, numerical simulation and experimental phenomena are qualitatively consistent. In general, these findings confirm the feasibility of the method and improve the understanding of the physical process of CO2 convective dissolution, which can help assess the CO2 solubility trapping mass.

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“…10 The convection-driven dissolution has been extensively studied experimentally for accelerated CO 2 dissolution in saline water under gravity for CO 2 storage inside two-dimension (2-dim) Hele-Shaw cells or 3-dimension (3-dim) cylindrical cells. [11][12][13][14][15][16][17][18][19][20][21][22] To make the CO 2 convective flow inside fluids (water or oil) analogous to 2-dim, Hele-Shaw cells are used. 23 Hele-Shaw cells are constructed by two parallel flat plates with a small gap in between (generally less than 10 mm).…”

Section: Introductionmentioning

confidence: 99%

“…CO 2 mixing in water/brine visualization experiments involving heterogeneity is very limited. Taheri et al 14 have conducted a series of experiments of density-driven natural convection of CO 2 in saline water in a heterogeneous system. They have used a Hele-Shaw (50 cm × 50 cm × 12 mm) cell at atmospheric conditions (1 bar, 23°C) for visualization investigations.…”

Section: Introductionmentioning

confidence: 99%

Visual investigation of CO₂ dissolution and convection in heterogeneous porous media at reservoir temperature and pressure conditions

2021

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CO 2 convective mixing in saline aquifers has been widely studied numerically and experimentally. Reservoir heterogeneity is significant for CO 2 convective mixing and experimental studies are still limited. In this study, we have conducted a visualization of CO 2 convective mixing experiments in heterogeneous porous media at reservoir conditions using CO 2 and water. We have used a two-dimension Hele-Shaw cell, different glass beads of different permeability at porous media, and water solution with pH indicator. Glass beads were packed in a different way (horizontally and vertically) to generate the heterogeneity inside the test cell. We have studied transport velocity deviation due to the heterogeneity and effects of permeability transition zone together with the effects of boundary conditions. It was found out that having a low permeable layer below a high permeable layer restructure the flow of CO 2 fingers and dampens the CO 2 transport velocity. With the vertical permeability zones, having a high permeability zone accelerates CO 2 gravity transport through that zone which is a good representation for a fracture or a fault in the reservoir. CO 2 convection onset is governed by the vertical high-permeable layer. Boundary conditions have been dominant with the presence of high permeable zones. It also found out that the experimental results presented in this study match with the simulation studies that are available in the literature.

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Qualitative and quantitative experimental study of convective mixing process during storage of CO 2 in homogeneous saline aquifers

Cited by 16 publications

References 37 publications

A Novel Experimental Study on Density‐Driven Instability and Convective Dissolution in Porous Media

A Novel Experimental Study on Density‐Driven Instability and Convective Dissolution in Porous Media

New Spectrophotometric Method for Quantitative Characterization of Density-Driven Convective Instability

Visual investigation of CO₂ dissolution and convection in heterogeneous porous media at reservoir temperature and pressure conditions

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Qualitative and quantitative experimental study of convective mixing process during storage of CO 2 in homogeneous saline aquifers

Cited by 16 publications

References 37 publications

A Novel Experimental Study on Density‐Driven Instability and Convective Dissolution in Porous Media

A Novel Experimental Study on Density‐Driven Instability and Convective Dissolution in Porous Media

New Spectrophotometric Method for Quantitative Characterization of Density-Driven Convective Instability

Visual investigation of CO2 dissolution and convection in heterogeneous porous media at reservoir temperature and pressure conditions

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Visual investigation of CO₂ dissolution and convection in heterogeneous porous media at reservoir temperature and pressure conditions