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Influence of Gas Flooding Pressure on Groundwater Flow during Oil Shale In Situ Exploitation

Author

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  • Lihong Yang

    (Production Engineering Division, Sinopec Exploration & Production Research Institute, Beijing 100083, China)

  • Zhao Liu

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Shale Oil & Gas Exploration and Development, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

  • Hao Zeng

    (Production Engineering Division, Sinopec Exploration & Production Research Institute, Beijing 100083, China)

  • Jianzheng Su

    (Production Engineering Division, Sinopec Exploration & Production Research Institute, Beijing 100083, China)

  • Yiwei Wang

    (Production Engineering Division, Sinopec Exploration & Production Research Institute, Beijing 100083, China)

  • Xudong Chen

    (Production Engineering Division, Sinopec Exploration & Production Research Institute, Beijing 100083, China)

  • Wei Guo

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Shale Oil & Gas Exploration and Development, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

Abstract

In order to weaken the influence of external groundwater on in situ pyrolysis exploitation, the flow characteristics of groundwater were studied according to the oil shale reservoir characteristics of Qingshankou Formation in Songliao Basin, China. In addition, the parameters of marginal gas flooding for water-stopping were optimized. Taking a one-to-one pattern and a five-spot pattern as examples, the characteristics of groundwater flow under the in situ process were studied. Under the one-to-one pattern, the external groundwater flows into the production well from the low-pressure side, and the water yield was basically stable at 1000 kg/d. In the five-spot pattern, the groundwater can flow into the production wells directly from the windward side, and the water yield of the production well on the leeward side mainly comes from the desaturated zone; the water yield of each production well remains at a high level. By setting water-stopping wells around the production well and keeping the gas flooding pressure slightly higher than the production well, the water yield of the production well can be reduced and stabilized within 100 kg/d under gas flooding pressures of 3 and 5 MPa. However, the gas yield of the production well slightly decreased when the gas flooding pressure reduced from 5 to 3 MPa. Therefore, the gas flooding pressure of water-stopping wells shall be determined in combination with the water yield and gas yield, so as to achieve the best process effect. It is expected that the results will provide technical support for large-scale oil shale in situ pyrolysis exploitation.

Suggested Citation

  • Lihong Yang & Zhao Liu & Hao Zeng & Jianzheng Su & Yiwei Wang & Xudong Chen & Wei Guo, 2021. "Influence of Gas Flooding Pressure on Groundwater Flow during Oil Shale In Situ Exploitation," Energies, MDPI, vol. 14(24), pages 1-12, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:24:p:8363-:d:700430
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    References listed on IDEAS

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    1. Kang, Zhiqin & Zhao, Yangsheng & Yang, Dong, 2020. "Review of oil shale in-situ conversion technology," Applied Energy, Elsevier, vol. 269(C).
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