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Title: Numerical Modeling of CO 2 and Brine Leakage through Open Fracture in a Fault Zone: Open Channel Flow or Darcy Flow

Abstract

Understanding fluids migration and leakage risk along the fault zone is necessary to guarantee the safety of CO 2geological storage. The validity of Darcy’s law gets challenged in dealing with the flow in open fractures since the occurring of turbulence flow. In this study, we develop a 2D model with usage of T2Well, an integrated wellbore-reservoir simulator, to investigate the leakage problem along open fractures which are embedded in a fault zone from the deep injection reservoir to shallow aquifers. The results record a positive feedback of gas expansion and pressure response in fracture, which causes a quick downward propagation of highly gas saturated zone from the top of fracture and an easy gas breakthrough in the shallower aquifers. The decreasing of aperture size of fracture significantly enhances the leakage rates in fracture, but with less influences as aperture increases. In comparison, the Equivalent Porous Media models show a good approximation with the momentum model of large apertures but poor for the small one. Nevertheless, the differences are small in terms of final CO 2distribution among various aquifers, suggesting that Darcy’s law may be still “effective” in solving flow problem along fractures in a constant injection system at a largemore » time scale.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]
  1. China Univ. of Geosciences, Wuhan (China)
  2. 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 Fossil Energy (FE)
OSTI Identifier:
1476455
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Geofluids
Additional Journal Information:
Journal Volume: 2017; Journal ID: ISSN 1468-8115
Publisher:
Hindawi
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Liu, Ning, Pan, Lehua, and Cheng, Jianmei. Numerical Modeling of CO2 and Brine Leakage through Open Fracture in a Fault Zone: Open Channel Flow or Darcy Flow. United States: N. p., 2017. Web. doi:10.1155/2017/9035032.
Liu, Ning, Pan, Lehua, & Cheng, Jianmei. Numerical Modeling of CO2 and Brine Leakage through Open Fracture in a Fault Zone: Open Channel Flow or Darcy Flow. United States. doi:10.1155/2017/9035032.
Liu, Ning, Pan, Lehua, and Cheng, Jianmei. Wed . "Numerical Modeling of CO2 and Brine Leakage through Open Fracture in a Fault Zone: Open Channel Flow or Darcy Flow". United States. doi:10.1155/2017/9035032. https://www.osti.gov/servlets/purl/1476455.
@article{osti_1476455,
title = {Numerical Modeling of CO2 and Brine Leakage through Open Fracture in a Fault Zone: Open Channel Flow or Darcy Flow},
author = {Liu, Ning and Pan, Lehua and Cheng, Jianmei},
abstractNote = {Understanding fluids migration and leakage risk along the fault zone is necessary to guarantee the safety of CO2geological storage. The validity of Darcy’s law gets challenged in dealing with the flow in open fractures since the occurring of turbulence flow. In this study, we develop a 2D model with usage of T2Well, an integrated wellbore-reservoir simulator, to investigate the leakage problem along open fractures which are embedded in a fault zone from the deep injection reservoir to shallow aquifers. The results record a positive feedback of gas expansion and pressure response in fracture, which causes a quick downward propagation of highly gas saturated zone from the top of fracture and an easy gas breakthrough in the shallower aquifers. The decreasing of aperture size of fracture significantly enhances the leakage rates in fracture, but with less influences as aperture increases. In comparison, the Equivalent Porous Media models show a good approximation with the momentum model of large apertures but poor for the small one. Nevertheless, the differences are small in terms of final CO2distribution among various aquifers, suggesting that Darcy’s law may be still “effective” in solving flow problem along fractures in a constant injection system at a large time scale.},
doi = {10.1155/2017/9035032},
journal = {Geofluids},
number = ,
volume = 2017,
place = {United States},
year = {2017},
month = {12}
}

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