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Effect of gravity segregation on CO2 flooding under various pressure conditions: Application to CO2 sequestration and oil production

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  • Xiaolong, Chen
  • Yiqiang, Li
  • Xiang, Tang
  • Huan, Qi
  • Xuebing, Sun
  • Jianghao, Luo

Abstract

This research evaluates the effect of gravity segregation on CO2 sequestration and oil production during CO2 flooding under immiscible, near-miscible, and miscible conditions. The core experiment results show that CO2 flooding recovery was seriously affected by gravity under immiscible conditions, while under miscible conditions, this influence was not apparent. Visual experiments show when immiscible, gravity restricts the oil and gas front’s stability, and different gas injection strategies have evident differences in the swept region; when miscible, gravity has almost no effect on the swept region. These results indicate that when CO2 immiscible flooding is implemented, the reservoir thickness affects the choice of gas injection direction. However, for miscible flooding, the reservoir thickness and gas injection direction are not essential for developing CO2 flooding. In immiscible conditions, gas injection velocity greatly restricts the CO2 gravity flooding recovery; in miscible conditions, the velocity is no longer the main influencing index of CO2 gravity flooding recovery. For CO2 sequestration, gravity segregation is conducive to increasing CO2 sequestration potential. As the pressure increases, the influence of gravity on CO2 sequestration weakens. Regardless of whether there is gravity effect, the best oil recovery and gas sequestration potential of CO2 flooding is obtained under miscible conditions.

Suggested Citation

  • Xiaolong, Chen & Yiqiang, Li & Xiang, Tang & Huan, Qi & Xuebing, Sun & Jianghao, Luo, 2021. "Effect of gravity segregation on CO2 flooding under various pressure conditions: Application to CO2 sequestration and oil production," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221005430
    DOI: 10.1016/j.energy.2021.120294
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    References listed on IDEAS

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    1. Ampomah, W. & Balch, R.S. & Cather, M. & Will, R. & Gunda, D. & Dai, Z. & Soltanian, M.R., 2017. "Optimum design of CO2 storage and oil recovery under geological uncertainty," Applied Energy, Elsevier, vol. 195(C), pages 80-92.
    2. Gibbins, Jon & Chalmers, Hannah, 2008. "Carbon capture and storage," Energy Policy, Elsevier, vol. 36(12), pages 4317-4322, December.
    3. Han, Jinju & Lee, Minkyu & Lee, Wonsuk & Lee, Youngsoo & Sung, Wonmo, 2016. "Effect of gravity segregation on CO2 sequestration and oil production during CO2 flooding," Applied Energy, Elsevier, vol. 161(C), pages 85-91.
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    Cited by:

    1. Wang, Zhoujie & Zhu, Jianzhong & Li, Songyan, 2023. "Novel strategy for reducing the minimum miscible pressure in a CO2–oil system using nonionic surfactant: Insights from molecular dynamics simulations," Applied Energy, Elsevier, vol. 352(C).
    2. Chen, Hao & Liu, Xiliang & Zhang, Chao & Tan, Xianhong & Yang, Ran & Yang, Shenglai & Yang, Jin, 2022. "Effects of miscible degree and pore scale on seepage characteristics of unconventional reservoirs fluids due to supercritical CO2 injection," Energy, Elsevier, vol. 239(PC).
    3. Hao, Yongmao & Li, Zongfa & Su, Yuliang & Kong, Chuixian & Chen, Hong & Meng, Yang, 2022. "Experimental investigation of CO2 storage and oil production of different CO2 injection methods at pore-scale and core-scale," Energy, Elsevier, vol. 254(PB).

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