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Numerical Study on the Enhanced Oil Recovery by CO 2 Huff-n-Puff in Shale Volatile Oil Formations

Author

Listed:
  • Aiwei Zheng

    (Sinopec Shale Oil and Gas Exploration and Development Key Laboratory, Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Wuhan 430223, China)

  • Wentao Lu

    (Sinopec Shale Oil and Gas Exploration and Development Key Laboratory, Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Wuhan 430223, China)

  • Rupeng Zhang

    (State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China)

  • Hai Sun

    (State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

The Sichuan Basin’s Liangshan Formation shale is rich in oil and gas resources, yet the recovery rate of shale oil reservoirs typically falls below 10%. Currently, gas injection huff-n-puff (H-n-P) is considered one of the most promising methods for improving shale oil recovery. This study numerically investigates the application of the CO 2 huff-n-puff process in enhancing oil recovery in shale volatile oil reservoirs. Using an actual geological model and fluid properties of shale oil reservoirs in the Sichuan Basin, the CO 2 huff-n-puff process was simulated. The model takes into account the molecular diffusion of CO 2 , adsorption, stress sensitivity effects, and nanopore confinement. After history matching, through sensitivity analysis, the optimal injection rate of 400 tons/day, soaking time of 30 days, and three cycles of huff-n-puff were determined to be the most effective. The simulation results show that, compared with other gases, CO 2 has significant potential in improving the recovery rate and overall efficiency of shale oil reservoirs. This study is of great significance and can provide valuable references for the actual work of CO 2 huff-n-puff processes in shale volatile oil reservoirs of the Sichuan Basin.

Suggested Citation

  • Aiwei Zheng & Wentao Lu & Rupeng Zhang & Hai Sun, 2024. "Numerical Study on the Enhanced Oil Recovery by CO 2 Huff-n-Puff in Shale Volatile Oil Formations," Energies, MDPI, vol. 17(19), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:19:p:4881-:d:1488314
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