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Title: Identification of potential CO2 leakage pathways and mechanisms in oil reservoirs using fault tree analysis

Abstract

Geological storage of CO2 technologies has become an important and effective way to reduce the greenhouse gas emissions, especially when it is combined with CO2 enhanced oil recovery (EOR), which can not only trap CO2 but also enhance oil recovery. However, the risk of CO2 leakage has always been a prominent issue. In this paper, the mechanisms and pathways of CO2 leakage during geological storage in oil reservoirs were analyzed using fault tree analysis (FTR). Besides, monitoring technologies were discussed and deployed in a CO2 EOR demonstration project. The analysis results showed that the sealing failures of oil producer and CO2 injector wells, like well cement failure and casing failure, are the main reasons for the CO2 leakage, which has been observed in the oil field monitoring project. The monitoring results indicated that there is no large-scale CO2 leakage, while relatively high and abnormal CO2 concentration in soil gas near some wellbores are observed, which indicates there is some leakage of CO2 through incomplete cement ring and well casing string. FTR results provide guidelines for monitoring and preventing of CO2 leakage during geological storage in oil reservoirs. Finally, the near-surface monitoring methods, especially the soil gas monitoring technologies, can effectivelymore » detect the leakage of CO2, and are a proper method for CO2 leakage monitoring.« less

Authors:
ORCiD logo [1];  [2];  [2];  [3]; ORCiD logo [4];  [1]
  1. Univ. of Tulsa, OK (United States)
  2. China Univ. of Petroleum, Qingdao (China)
  3. Univ. of Texas, Austin, TX (United States). Bureau of Economic Geology
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1630891
Report Number(s):
LA-UR-20-21829
Journal ID: ISSN 2152-3878
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Greenhouse Gases: Science and Technology
Additional Journal Information:
Journal Volume: 10; Journal Issue: 2; Journal ID: ISSN 2152-3878
Publisher:
Society of Chemical Industry, Wiley
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; earth sciences; CO2 geological storage; CO2 leakage pathways; fault tree analysis; near-surface monitoring

Citation Formats

Wang, Yanqing, Zhang, Liang, Ren, Shaoran, Ren, Bo, Chen, Bailian, and Lu, Jun. Identification of potential CO2 leakage pathways and mechanisms in oil reservoirs using fault tree analysis. United States: N. p., 2020. Web. https://doi.org/10.1002/ghg.1959.
Wang, Yanqing, Zhang, Liang, Ren, Shaoran, Ren, Bo, Chen, Bailian, & Lu, Jun. Identification of potential CO2 leakage pathways and mechanisms in oil reservoirs using fault tree analysis. United States. https://doi.org/10.1002/ghg.1959
Wang, Yanqing, Zhang, Liang, Ren, Shaoran, Ren, Bo, Chen, Bailian, and Lu, Jun. Tue . "Identification of potential CO2 leakage pathways and mechanisms in oil reservoirs using fault tree analysis". United States. https://doi.org/10.1002/ghg.1959. https://www.osti.gov/servlets/purl/1630891.
@article{osti_1630891,
title = {Identification of potential CO2 leakage pathways and mechanisms in oil reservoirs using fault tree analysis},
author = {Wang, Yanqing and Zhang, Liang and Ren, Shaoran and Ren, Bo and Chen, Bailian and Lu, Jun},
abstractNote = {Geological storage of CO2 technologies has become an important and effective way to reduce the greenhouse gas emissions, especially when it is combined with CO2 enhanced oil recovery (EOR), which can not only trap CO2 but also enhance oil recovery. However, the risk of CO2 leakage has always been a prominent issue. In this paper, the mechanisms and pathways of CO2 leakage during geological storage in oil reservoirs were analyzed using fault tree analysis (FTR). Besides, monitoring technologies were discussed and deployed in a CO2 EOR demonstration project. The analysis results showed that the sealing failures of oil producer and CO2 injector wells, like well cement failure and casing failure, are the main reasons for the CO2 leakage, which has been observed in the oil field monitoring project. The monitoring results indicated that there is no large-scale CO2 leakage, while relatively high and abnormal CO2 concentration in soil gas near some wellbores are observed, which indicates there is some leakage of CO2 through incomplete cement ring and well casing string. FTR results provide guidelines for monitoring and preventing of CO2 leakage during geological storage in oil reservoirs. Finally, the near-surface monitoring methods, especially the soil gas monitoring technologies, can effectively detect the leakage of CO2, and are a proper method for CO2 leakage monitoring.},
doi = {10.1002/ghg.1959},
journal = {Greenhouse Gases: Science and Technology},
number = 2,
volume = 10,
place = {United States},
year = {2020},
month = {2}
}

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