This paper examines the critical challenges of maintaining well integrity when repurposing oil and gas wells for carbon capture and storage (CCS) projects. It outlines geological storage options such as deep saline aquifers, unmineable coalbeds, and depleted oil and gas reservoirs, emphasizing the potential of depleted reservoirs for CO2 storage due to their available data and favorable conditions. A key focus is placed on the risks associated with injecting CO2 into existing wells, particularly the potential for leakage through compromised wellbore integrity. Issues including casing failures, cement degradation, and operational failures during abandonment are discussed. To mitigate these risks, solutions are proposed that focus on material selection, equipment integrity, and effective well monitoring strategies. Successful case studies, including a CO2 production well in Colorado and an offshore CO2-EOR pilot test between Japan and Vietnam, are analyzed to demonstrate how well these solutions were applied in practice. The paper contributes to improving well integrity in CCS, helping to ensure the long-term success of CO2 storage projects and supporting global sustainability goals.
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ISRM VietRock - Vietnamese National Congress of Rock Mechanics and Rock Engineering
October 26, 2024
26 October
Ensuring Well Integrity in Oil and Gas Wells Repurposed for CO2 Injection: Mechanical and Operational Perspectives
Nguyen Thi Hai;
Nguyen Thi Hai
Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City
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Truong Van Tu
Truong Van Tu
Drilling and Production Department, Faculty of Petroleum and Energy, Hanoi University of Mining and Geology
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Paper presented at the ISRM VietRock - Vietnamese National Congress of Rock Mechanics and Rock Engineering, 26 October, October 2024.
Paper Number:
ISRM-VIETROCK-2024-015
Published:
October 26 2024
Citation
Hai, Nguyen Thi, and Truong Van Tu. "Ensuring Well Integrity in Oil and Gas Wells Repurposed for CO2 Injection: Mechanical and Operational Perspectives." Paper presented at the ISRM VietRock - Vietnamese National Congress of Rock Mechanics and Rock Engineering, 26 October, October 2024.
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