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Injection energy utilization efficiency and production performance of oil shale in-situ exploitation

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  • Shi, Yu
  • Zhang, Yulong
  • Song, Xianzhi
  • Cui, Qiliang
  • Lei, Zhihong
  • Song, Guofeng

Abstract

Oil shale in-situ conversion is an effective and promising exploitation method. The most concerned problem of oil shale in-situ conversion is how to exploit maximum oil and gas by injecting the least energy. However, the relationship between injection energy utilization efficiency and productivity under different operational conditions remain unclear. In this paper, based on a multiphase flow, heat transfer and chemical reaction numerical model, evolution of kerogen pyrolysis with reservoir temperature distribution is thoroughly analyzed. Aims at injection energy utilization efficiency and productivity, effects of injection energy rate, well shut-in measure, reservoir pressure and well spacing on the production performance of the oil shale in-situ exploitation are investigated. Results show that the useless heating region exists during kerogen pyrolysis, which significantly reduces the energy utilization efficiency. A shut-in measure can slightly improve the energy utilization efficiency but lower oil output, thus not a very effective measure to solve the useless heating problem. Under the same energy injection rate, a higher injection temperature and lower injection flow rate will simultaneously obtain higher oil production rate, oil output, and energy utilization efficiency. Furthermore, a larger reservoir pressure and well spacing of 40 m–50 m are recommended to obtain higher oil production rate and output. Results provide meaningful suggestions for optimizing operational parameters in view of injection energy utilization efficiency and oil output.

Suggested Citation

  • Shi, Yu & Zhang, Yulong & Song, Xianzhi & Cui, Qiliang & Lei, Zhihong & Song, Guofeng, 2023. "Injection energy utilization efficiency and production performance of oil shale in-situ exploitation," Energy, Elsevier, vol. 263(PB).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pb:s0360544222026007
    DOI: 10.1016/j.energy.2022.125714
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    References listed on IDEAS

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    1. Al-Ayed, Omar S. & Matouq, M. & Anbar, Z. & Khaleel, Adnan M. & Abu-Nameh, Eyad, 2010. "Oil shale pyrolysis kinetics and variable activation energy principle," Applied Energy, Elsevier, vol. 87(4), pages 1269-1272, April.
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    3. Song, Xianzhi & Zhang, Chengkai & Shi, Yu & Li, Gensheng, 2019. "Production performance of oil shale in-situ conversion with multilateral wells," Energy, Elsevier, vol. 189(C).
    4. Wang, Guoying & Liu, Shaowei & Yang, Dong & Fu, Mengxiong, 2022. "Numerical study on the in-situ pyrolysis process of steeply dipping oil shale deposits by injecting superheated water steam: A case study on Jimsar oil shale in Xinjiang, China," Energy, Elsevier, vol. 239(PC).
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    Cited by:

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    2. Cui, Ziang & Sun, Mengdi & Mohammadian, Erfan & Hu, Qinhong & Liu, Bo & Ostadhassan, Mehdi & Yang, Wuxing & Ke, Yubin & Mu, Jingfu & Ren, Zijie & Pan, Zhejun, 2024. "Characterizing microstructural evolutions in low-mature lacustrine shale: A comparative experimental study of conventional heat, microwave, and water-saturated microwave stimulations," Energy, Elsevier, vol. 294(C).
    3. Huang, Xudong & Kang, Zhiqin & Zhao, Jing & Wang, Guoying & Zhang, Hongge & Yang, Dong, 2023. "Experimental investigation on micro-fracture evolution and fracture permeability of oil shale heated by water vapor," Energy, Elsevier, vol. 277(C).
    4. Guo, Wei & Zhang, Xu & Sun, Youhong & Li, Qiang & Liu, Zhao, 2023. "Migration mechanism of pyrolysis oil during oil shale in situ pyrolysis exploitation," Energy, Elsevier, vol. 285(C).
    5. Zhang, Shuo & Song, Shengyuan & Zhang, Wen & Zhao, Jinmin & Cao, Dongfang & Ma, Wenliang & Chen, Zijian & Hu, Ying, 2023. "Research on the inherent mechanism of rock mass deformation of oil shale in-situ mining under the condition of thermal-fluid-solid coupling," Energy, Elsevier, vol. 280(C).

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