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Effects of Injection Temperature and Well Connectivity on Reservoir Stability and Storage Efficiency in Shale
Zhengjun Ge1, Zhilin Wang1, Chengzheng Cai2,3
1Research Institute of Exploration and Development, Jiangsu Oilfield Company, SINOPEC, Yangzhou, Jiangsu 225009, China.
ACS Omega
|February 2, 2026
Summary
Injecting CO2 into shale for carbon sequestration faces challenges from thermo-hydromechanical (THM) coupling. Optimizing injection temperature and well connectivity is crucial for balancing sequestration efficiency with reservoir-wellbore stability.
Area of Science:
- Geosciences
- Petroleum Engineering
- Environmental Engineering
Background:
- Carbon sequestration in shale reservoirs is vital for climate change mitigation.
- Thermo-hydromechanical (THM) coupling effects complicate CO2 injection and sequestration.
- Understanding these complex interactions is essential for safe and efficient deployment.
Purpose of the Study:
- To investigate the multifield evolution and system stability during CO2 injection in shale.
- To analyze the impact of varying CO2 injection temperatures and well connectivity.
- To identify optimal strategies for safe and efficient carbon sequestration.
Main Methods:
- Development of a fully coupled two-dimensional numerical model.
- Systematic simulation of CO2 injection under different thermal and connectivity conditions.
- Analysis of fluid migration, plume propagation, and stress distribution.
Main Results:
- Well connectivity dictates fluid migration paths, enhancing sweep efficiency but risking wellbore integrity.
- Lower injection temperatures accelerate sequestration but cause thermal shocks to monitoring wells.
- Higher injection temperatures improve stability but reduce diffusion efficiency.
Conclusions:
- A critical trade-off exists between sequestration efficiency and reservoir-wellbore stability.
- Synergistic interactions between thermal gradients and hydraulic connectivity govern system behavior.
- Findings support optimizing injection temperatures and well deployment for safe CO2 sequestration in shale.
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