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A Study on the Plugging Effect of Different Plugging Agent Combinations during CO 2 Flooding in Heterogeneous Reservoirs

Author

Listed:
  • Xuetong Zhang

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Wenjuan Ji

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Haiyang Yu

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Yilin Li

    (Drilling & Production Technology Research Institute of Jidong Oilfield, China National Petroleum Corporation Limited, Tangshan 063000, China)

  • Fei Yan

    (China Tianjin Branch of CNOOC (China) Limited, Tianjin 300452, China)

  • Weiqiang Song

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Xinrui Jiang

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Hongbao Wang

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

Gas channeling control is key to improving CO 2 -flooding efficiency. A traditional plugging system has disadvantages, such as poor adaptability and stability, leading to the poor plugging effect of CO 2 channeling in heterogeneous reservoirs and difficulty in controlling the subsequent CO 2 injection pressure. To achieve a significant plugging effect and effectively control the subsequent CO 2 injection pressure, a heterogeneous physical model of gas channeling in a horizontal well was established, and plugging experiments were conducted using four different combinations of plugging agents during CO 2 flooding. Three evaluation parameters were defined, including the temperature field variation coefficient (TFVC), medium-permeability diversion rate (MPDR), and subsequent injection pressure coefficient (SIPC). The plugging effect of different combinations of plugging agents during CO 2 flooding in heterogeneous reservoirs was analyzed. The results show that the plugging effect after using a combination of plugging agents was significantly better than after using a single plugging agent, and different plugging agent combinations had distinct characteristics. The strong–medium–weak (S-M-W) combination had the best MPDR for subsequent CO 2 flooding, but the SIPC was the highest. The strong–weak–strong–weak (S-W-S-W) and weak–strong–weak–strong (W-S-W-S) combinations could effectively control the SIPC. These results indicate that plugging using the S-W-S-W and W-S-W-S combinations can achieve an effective plugging effect and reasonably control the subsequent CO 2 injection pressure. This work provides a personalized design scheme for effective gas channeling control and maintenance of appropriate injection pressure during CO 2 flooding in heterogeneous reservoirs.

Suggested Citation

  • Xuetong Zhang & Wenjuan Ji & Haiyang Yu & Yilin Li & Fei Yan & Weiqiang Song & Xinrui Jiang & Hongbao Wang, 2024. "A Study on the Plugging Effect of Different Plugging Agent Combinations during CO 2 Flooding in Heterogeneous Reservoirs," Energies, MDPI, vol. 17(11), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2527-:d:1400568
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    References listed on IDEAS

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    1. Zhuang, Xinyu & Wang, Wendong & Su, Yuliang & Li, Yuan & Dai, Zhenxue & Yuan, Bin, 2024. "Spatio-temporal sequence prediction of CO2 flooding and sequestration potential under geological and engineering uncertainties," Applied Energy, Elsevier, vol. 359(C).
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