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Journal ArticleDOI

Simulation of Gravitational Instability and Thermo‐Solutal Convection During the Dissolution of CO in Deep Storage Reservoirs

About: This article is published in Water Resources Research.The article was published on 2020-01-01. It has received 18 citations till now. The article focuses on the topics: Multiphase flow & Convection.
Citations
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Journal ArticleDOI
01 May 2022-Energy
TL;DR: In this paper , the authors identified and analyzed 22 parameters, including thermal breakthrough time, mass flux, and overall energy recovery, for a given discrete fracture network, and performed an extensive sensitivity analysis using the design of the experiments method (Plackett-Burman) and identified key parameters influencing these three key aspects.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the authors show how high-resolution heterogeneity in both permeability and capillary entry pressure control dissolution and local capillary trapping of supercritical CO2 (ScCO2) can affect the second-order spatial moment of the ScCO2 saturation field in the horizontal direction.

21 citations

Journal ArticleDOI
01 May 2022-Energy
TL;DR: In this article , a fully coupled thermo-hydro-mechanical (THM) mechanism for enhanced geothermal system (EGS) operations is presented, and a sensitivity analysis is performed to investigate the relative importance of these parameters that concentrates on three key objective parameters: thermal breakthrough time, mass flux and overall energy recovery.

15 citations

Journal ArticleDOI
TL;DR: In this article, an ANN architecture composed of eight hidden layers and 20 neurons in the hidden layer was used to predict the thermal drawdown of an EGS system with a satisfactory range (R2 > 0.99).
Abstract: This work presents the prediction of thermal drawdown of an enhanced geothermal system (EGS) using artificial neural network (ANN). A three-dimensional numerical model of EGS was developed to generate the training and testing data sets for ANN. We have performed a quantitative study of geothermal energy production for various injection operating conditions and reservoir fracture aperture. Input parameters for ANN include temperature, mass flux, pressure, and fracture transmissivity, while the production well temperature is the output parameter. The Levenberg–Marquardt back-propagation learning algorithm, the tan-sigmoid, and the linear transfer function were used for the ANN optimization. The best results were obtained with an ANN architecture composed of eight hidden layers and 20 neurons in the hidden layer, which made it possible to predict the production temperature with a satisfactory range (R2 > 0.99). An appropriate accuracy of the ANN model was obtained with a percentage error less than (± 4.5). The results from the numerical simulations suggest that fracture transmissivity has less effect on thermal drawdown than the injection mass flux and temperature. From our results, we confirm that ANN modeling may predict the thermal drawdown of an EGS system with high accuracy.

11 citations

Journal ArticleDOI
TL;DR: In this paper, a CO2-driven cold-water geyser evolved within an abandoned wellbore in the northeast Qinghai-Tibet plateau, maintaining a steady eruption period of 330 s and a maximum instantaneous aqueous phase discharge rate of 68.53 kg/s.

5 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a thermodynamic model for the solubility of carbon dioxide (CO 2 ) in pure water and in aqueous NaCl solutions for temperatures from 273 to 533 K, for pressures from 0 to 2000 bar, and for ionic strength from 0.3 m is presented.

1,442 citations


"Simulation of Gravitational Instabi..." refers background in this paper

  • ...The solubility limit of CO2 increases with temperature and pressure (Duan & Sun, 2003; Mao et al., 2013)....

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Journal ArticleDOI
TL;DR: In this paper, a linear stability analysis of density-driven miscible flow in porous media in the context of carbon dioxide sequestration in saline aquifers is presented, based on the dominant mode of the self-similar diffusion operator, which can accurately predict the critical time and associated unstable wavenumber.
Abstract: We present a linear stability analysis of density-driven miscible flow in porous media in the context of carbon dioxide sequestration in saline aquifers. Carbon dioxide dissolution into the underlying brine leads to a local density increase that results in a gravitational instability. The physical phenomenon is analogous to the thermal convective instability in a semi-infinite domain, owing to a step change in temperature at the boundary. The critical time for the onset of convection in such problems has not been determined accurately by previous studies. We present a solution, based on the dominant mode of the self-similar diffusion operator, which can accurately predict the critical time and the associated unstable wavenumber. This approach is used to explain the instability mechanisms of the critical time and the long-wave cutoff in a semi-infinite domain. The dominant mode solution, however, is valid only for a small parameter range. We extend the analysis by employing the quasi-steady-state approximation (QSSA) which provides accurate solutions in the self-similar coordinate system. For large times, both the maximum growth rate and the most dangerous mode decay as , respectively. The instability problem is also analysed in the nonlinear regime by high-accuracy direct numerical simulations. The nonlinear simulations at short times show good agreement with the linear stability predictions. At later times, macroscopic fingers display intense nonlinear interactions that significantly influence both the front propagation speed and the overall mixing rate. A dimensional analysis for typical aquifers shows that for a permeability variation of 1—3000 mD, the critical time can vary from 2000 yrs to about 10 days while the critical wavelength can be between 200 m and 0.3 m.

664 citations


"Simulation of Gravitational Instabi..." refers methods in this paper

  • ...Based on linear stability analysis, Riaz et al. (2006), Ennis-King and Paterson (2005), Xu et al. (2006), and Huppert and Neufeld (2014) found that the onset time of solutal fingers due to gravitational instability was inversely proportional to the square of reservoir permeability....

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Journal ArticleDOI

455 citations


"Simulation of Gravitational Instabi..." refers background or methods in this paper

  • ...Based on linear stability analysis, Riaz et al. (2006), Ennis-King and Paterson (2005), Xu et al. (2006), and Huppert and Neufeld (2014) found that the onset time of solutal fingers due to gravitational instability was inversely proportional to the square of reservoir permeability....

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  • ...Ennis-King and Paterson (2005) found that convective mixing plays a dominant role in CO2 dissolution, and the onset time of instability may range between a year to hundreds of years....

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Journal ArticleDOI
TL;DR: A new semianalytical solution framework allows simple and efficient prediction of leakage rates for the case of injection of supercritical CO2 into a brine-saturated deep aquifer and estimates the CO2 plume extent in the overlying aquifer into which the fluid leaks.
Abstract: Capture and subsequent injection of carbon dioxide into deep geological formations is being considered as a means to reduce anthropogenic emissions of CO2 to the atmosphere. If such a strategy is to be successful, the injected CO2 must remain within the injection formation for long periods of time, at least several hundred years. Because mature continental sedimentary basins have a century-long history of oil and gas exploration and production, they are characterized by large numbers of existing oil and gas wells. For example, more than 1 million such wells have been drilled in the state of Texas in the United States. These existing wells represent potential leakage pathways for injected CO2. To analyze leakage potential, modeling tools are needed that predict leakage rates and patterns in systems with injection and potentially leaky wells. A new semianalytical solution framework allows simple and efficient prediction of leakage rates for the case of injection of supercritical CO2 into a brine-saturated d...

324 citations


"Simulation of Gravitational Instabi..." refers background in this paper

  • ...Later, Nordbotten et al. (2005), Cihan et al. (2011), and Hou et al. (2012) developed semianalytical, analytical, and numerical models, respectively, to accurately predict the leakage of CO2 from the reservoir....

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Journal ArticleDOI
TL;DR: In this article, the basic equation for volume, heat and CO2 flux in a porous medium which is subject to both a temperature field and molecular diffusion have been analyzed with respect to the stability criteria for convectional vertical flow.

308 citations


"Simulation of Gravitational Instabi..." refers background in this paper

  • ...Lindeberg & Wessel-Berg (1997) analytically derived stability criteria for the combined effect of thermal and molecular diffusion on the diffusion-convection process associated with CO2 storage at nonisothermal conditions....

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