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Legacy Well Leakage Risk Analysis at the Farnsworth Unit Site

Author

Listed:
  • Shaoping Chu

    (Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA)

  • Hari Viswanathan

    (Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA)

  • Nathan Moodie

    (Energy and Geoscience Institute, The University of Utah, Salt Lake City, UT 84108, USA)

Abstract

This paper summarizes the results of the risk analysis and characterization of the CO 2 and brine leakage potential of Farnsworth Unit (FWU) site wells. The study is part of the U.S. DOE’s National Risk Assessment Partnership (NRAP) program, which aims to quantitatively evaluate long-term environmental risks under conditions of significant geologic uncertainty and variability. To achieve this, NRAP utilizes risk assessment and computational tools specifically designed to quantify uncertainties and calculate the risk associated with geologic carbon dioxide (CO 2 ) sequestration. For this study, we have developed a workflow that utilizes physics-based reservoir simulation results as input to perform leakage calculations using NRAP Tools, specifically NRAP-IAM-CS and RROM-Gen. These tools enable us to conduct leakage risk analysis based on ECLIPSE reservoir simulation results and to characterize wellbore leakage at the Farnsworth Unit Site. We analyze the risk of leakage from both individual wells and the entire field under various wellbore integrity distribution scenarios. The results of the risk analysis for the leakage potential of FWU wells indicate that, when compared to the total amount of CO 2 injected, the highest cemented well integrity distribution scenario (FutureGen high flow rate) exhibits approximately 0.01% cumulative CO 2 leakage for a 25-year CO 2 injection duration at the end of a 50-year post-injection monitoring period. In contrast, the highest possible leakage scenario (open well) shows approximately 0.1% cumulative CO 2 leakage over the same time frame.

Suggested Citation

  • Shaoping Chu & Hari Viswanathan & Nathan Moodie, 2023. "Legacy Well Leakage Risk Analysis at the Farnsworth Unit Site," Energies, MDPI, vol. 16(18), pages 1-26, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6437-:d:1233819
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    References listed on IDEAS

    as
    1. Ting Xiao & Brian McPherson & Richard Esser & Wei Jia & Zhenxue Dai & Shaoping Chu & Feng Pan & Hari Viswanathan, 2020. "Chemical Impacts of Potential CO 2 and Brine Leakage on Groundwater Quality with Quantitative Risk Assessment: A Case Study of the Farnsworth Unit," Energies, MDPI, vol. 13(24), pages 1-14, December.
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