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Performance Evaluation of CO 2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs

Author

Listed:
  • Xingbang Meng

    (Petroleum Engineering, China University of Petroleum (East China), Qingdao 266000, China)

  • Zhan Meng

    (Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 042, Canada)

  • Jixiang Ma

    (PetroChina Huabei Oilfield Company, Renqiu 062552, China)

  • Tengfei Wang

    (Petroleum Engineering, China University of Petroleum (East China), Qingdao 266000, China)

Abstract
When the reservoir pressure is decreased lower than the dew point pressure in shale gas condensate reservoirs, condensate would be formed in the formation. Condensate accumulation severely reduces the commercial production of shale gas condensate reservoirs. Seeking ways to mitigate condensate in the formation and enhance both condensate and gas recovery in shale reservoirs has important significance. Very few related studies have been done. In this paper, both experimental and numerical studies were conducted to evaluate the performance of CO 2 huff-n-puff to enhance the condensate recovery in shale reservoirs. Experimentally, CO 2 huff-n-puff tests on shale core were conducted. A theoretical field scale simulation model was constructed. The effects of injection pressure, injection time, and soaking time on the efficiency of CO 2 huff-n-puff were examined. Experimental results indicate that condensate recovery was enhanced to 30.36% after 5 cycles of CO 2 huff-n-puff. In addition, simulation results indicate that the injection period and injection pressure should be optimized to ensure that the pressure of the main condensate region remains higher than the dew point pressure. The soaking process should be determined based on the injection pressure. This work may shed light on a better understanding of the CO 2 huff-n-puff- enhanced oil recovery (EOR) strategy in shale gas condensate reservoirs.

Suggested Citation

  • Xingbang Meng & Zhan Meng & Jixiang Ma & Tengfei Wang, 2018. "Performance Evaluation of CO 2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs," Energies, MDPI, vol. 12(1), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:12:y:2018:i:1:p:42-:d:192874
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    References listed on IDEAS

    as
    1. Zuloaga, Pavel & Yu, Wei & Miao, Jijun & Sepehrnoori, Kamy, 2017. "Performance evaluation of CO2 Huff-n-Puff and continuous CO2 injection in tight oil reservoirs," Energy, Elsevier, vol. 134(C), pages 181-192.
    2. Ren, Bo & Ren, Shaoran & Zhang, Liang & Chen, Guoli & Zhang, Hua, 2016. "Monitoring on CO2 migration in a tight oil reservoir during CCS-EOR in Jilin Oilfield China," Energy, Elsevier, vol. 98(C), pages 108-121.
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    Cited by:

    1. Mohamed Mehana & Qinjun Kang & Hari Viswanathan, 2020. "Molecular-Scale Considerations of Enhanced Oil Recovery in Shale," Energies, MDPI, vol. 13(24), pages 1-13, December.

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