Well integrity/control

Leakage Rate Modeling in Depleted Gas Fields Safeguards Well Integrity, CO2 Storage

The authors describe a study in which leakage-rate modeling was performed to identify and evaluate the associated risks for designing a remedial action plan to safeguard a CO2 storage site.

Side scan sonar record showing seabed conditions surrounding the actual wells found.
Side scan sonar record showing seabed conditions surrounding the actual wells found.

Ensuring the long-term integrity of existing plugged and abandoned (P&A) and active wells that penetrated a studied CO2 storage reservoir was key to reduction of leakage risks along the well path for long-term containment sustainability. With a goal of developing depleted gas fields as carbon dioxide (CO2) storage sites in offshore Sarawak, determining the complexity involved in restoring the integrity of these P&A wells, as well as the development wells, is critical. Leakage-rate modeling (LRM) was performed to identify and evaluate the associated risks for designing the remedial action plan.

CO2 Storage Challenges in Central Luconia

Storage sites in this study include three major depleted gas reservoirs in the Central Luconia gas field offshore Sarawak. Hydrocarbons from deeply buried reservoirs were produced through drilling of vertical and deviated wells.

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