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Title: A numerical simulation of a dry-out process for CO2 sequestration in heterogeneous deep saline aquifers: Original Research Article: Dry-out problem: Multifactorial numerical simulation

Abstract

Salt precipitation can be generated near the injection well when dry supercritical CO2 (scCO2) is injected into deep saline aquifers. Traditional laboratory experiments and numerical simulations focus on the generation of salt precipitation and its impact on core permeability. Current laboratory experimental studies have shown that the heterogeneity of the core and water content on the surface of the particles plays an important role in the formation of salt precipitation. The aim of this study is to explore the effects of brine back-flow, heterogeneity, and low water content on salt precipitation. Numerical simulations were performed using core-scale and site-scale models. Simulation results showed the following: 1. Back-flow plays an important role in the salt accumulation near the well – an homogeneous laboratory experiment used with a small core may not provide a full picture of the back-flow phenomenon. 2. The continuous dry-out process reduces the water content near the injection well to zero. As a result, the full range of saturation flow equations should be used to simulate the dry-out process accurately. 3. The heterogeneity of the matrix not only affects the distribution of salt precipitation but also increases the amount of salt precipitation near the well. Homogeneous simulation underestimatesmore » the amount of salt precipitation. 4. The reduction in porosity due to salt precipitation could extend the dry-out process in the low permeability zone, further expanding the salt precipitation area.« less

Authors:
ORCiD logo [1];  [2];  [3]
  1. Hohai Univ., Nanjing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Hohai Univ., Nanjing (China)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1567144
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Greenhouse Gases: Science and Technology
Additional Journal Information:
Journal Volume: 8; Journal Issue: 6; Journal ID: ISSN 2152-3878
Publisher:
Society of Chemical Industry, Wiley
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; dry‐out; back‐flow; heterogeneity; low water content; preferential flow; blockage

Citation Formats

Ren, Jie, Wang, Yuan, and Zhang, Yingqi. A numerical simulation of a dry-out process for CO2 sequestration in heterogeneous deep saline aquifers: Original Research Article: Dry-out problem: Multifactorial numerical simulation. United States: N. p., 2018. Web. doi:10.1002/ghg.1821.
Ren, Jie, Wang, Yuan, & Zhang, Yingqi. A numerical simulation of a dry-out process for CO2 sequestration in heterogeneous deep saline aquifers: Original Research Article: Dry-out problem: Multifactorial numerical simulation. United States. doi:10.1002/ghg.1821.
Ren, Jie, Wang, Yuan, and Zhang, Yingqi. Mon . "A numerical simulation of a dry-out process for CO2 sequestration in heterogeneous deep saline aquifers: Original Research Article: Dry-out problem: Multifactorial numerical simulation". United States. doi:10.1002/ghg.1821. https://www.osti.gov/servlets/purl/1567144.
@article{osti_1567144,
title = {A numerical simulation of a dry-out process for CO2 sequestration in heterogeneous deep saline aquifers: Original Research Article: Dry-out problem: Multifactorial numerical simulation},
author = {Ren, Jie and Wang, Yuan and Zhang, Yingqi},
abstractNote = {Salt precipitation can be generated near the injection well when dry supercritical CO2 (scCO2) is injected into deep saline aquifers. Traditional laboratory experiments and numerical simulations focus on the generation of salt precipitation and its impact on core permeability. Current laboratory experimental studies have shown that the heterogeneity of the core and water content on the surface of the particles plays an important role in the formation of salt precipitation. The aim of this study is to explore the effects of brine back-flow, heterogeneity, and low water content on salt precipitation. Numerical simulations were performed using core-scale and site-scale models. Simulation results showed the following: 1. Back-flow plays an important role in the salt accumulation near the well – an homogeneous laboratory experiment used with a small core may not provide a full picture of the back-flow phenomenon. 2. The continuous dry-out process reduces the water content near the injection well to zero. As a result, the full range of saturation flow equations should be used to simulate the dry-out process accurately. 3. The heterogeneity of the matrix not only affects the distribution of salt precipitation but also increases the amount of salt precipitation near the well. Homogeneous simulation underestimates the amount of salt precipitation. 4. The reduction in porosity due to salt precipitation could extend the dry-out process in the low permeability zone, further expanding the salt precipitation area.},
doi = {10.1002/ghg.1821},
journal = {Greenhouse Gases: Science and Technology},
number = 6,
volume = 8,
place = {United States},
year = {2018},
month = {10}
}

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Figures / Tables:

Figure 1 Figure 1: Schematic representation of the core-scale model: (a) short homogeneous core; (b) long homogeneous core; (c) layered heterogeneous core.

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