Well integrity/control

Well-Integrity Risk-Assessment Strategy Applied to CO2 Sequestration Project

This study evaluates well integrity and CO2-leakage risk in wells penetrating a CO2 storage reservoir in Malaysia.

Well-integrity risk-assessment matrix for development Well 17.
Fig. 1—Well-integrity risk-assessment matrix for development Well 17.

Depleted hydrocarbon reservoirs are considered inherently safe for carbon sequestration, but a high density of wells penetrating the carbon dioxide (CO2) storage reservoir could compromise containment performance in a carbon capture and sequestration (CCS) project. A risk-management methodology can be incorporated to evaluate primary and secondary barriers in existing plugged and abandoned (P&A) and development wells to ensure long-term viability of CO2 sequestration projects. The complete paper evaluates well-integrity and CO2 leakage risks along the wells in a depleted field that penetrates the CO2 storage reservoir.


The identified CO2 storage site offshore Malaysia is a depleted hydrocarbon field discovered in the early 1980s. Subsequently, two appraisal wells were drilled to further assess the field’s development potential.

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