Research progress on mechanism of wellbore integrity failure and feasibility of CO2 injection for existing wells of offshore CO2 geological storage
Offshore CO2 geological storage has great potential,but the cost is high.Reuse of offshore existing oil and gas production wells for CO2 injection wells has the characteristics of low cost and reduced risk of CO2 geological storage leakage,making it a highly potential CO2 geological storage method.This study summarizes the CO2 leakage pathways of the offshore existing wells,analyzes the failure mechanism and influencing factors of the well integrity of CO2 storage in offshore existing wells,based on this technology,summarized the feasibility evaluation methods for CO2 injection in offshore existing wells,and proposed future research directions.The research results indicated that there are few studies on the failure mechanism for CO2 injection in offshore existing wells,and the feasibility evaluation method for CO2 injection of offshore existing wells was not perfect.It was urgent to carry out research on the well integrity failure mechanism and the feasibility evaluation method for CO2 injection of offshore existing wells,which was of great significance for the safe and efficient offshore CO2 geological storage.
offshore CO2 geological storagere-existing wellswellbore integrityfailure mechanismfeasibility evaluation
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