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

Xuetong Zhang, Wenjuan Ji (), Haiyang Yu, Yilin Li, Fei Yan, Weiqiang Song, Xinrui Jiang and Hongbao Wang
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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

Energies, 2024, vol. 17, issue 11, 1-14

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.

Keywords: CO 2 channeling; plugging agent combinations; plugging effect; heterogeneous reservoirs (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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