Abstract:

CO₂ flooding and sequestration technology can significantly improve crude oil recovery rates while enge. However, the oil displaceabling large-scale CO₂ flooding and sequestration process is accompanied by various CO₂ leakage risks. In response to the lack of previous CO₂ leakage risk management systems, especially the absence of systems based on online monitoring that support dynamic risk management, research has been conducted on the construction of a CO₂ flooding and sequestration leakage risk management system. Based on the construction of CO₂ flooding and storage leakage risk management system, a dynamic CO₂ leakage risk management system integrating multi-environment real-time risk identification and assessment, multi-space risk prediction, multi-level risk early warning and whole process risk control was developed and applied to the CO₂ flooding and storage demonstration project of Yanchang Petroleum in Ordos Basin. Case studies demonstrate that the developed CO₂ leakage risk management system can dynamically identify various leakage risks throughout the CO₂ flooding and sequestration process across all spaces, effectively supporting the dynamic management of leakage risks. This provides comprehensive and timely safety assurance for CO₂ flooding and sequestration projects, ensuring that potential risks are managed and mitigated effectively to maintain the integrity and success of these projects.

Key words: CO₂ flooding and sequestration, CO₂ leakage, risk management, risk prediction, risk warning, decision support