Porthos Project: CO₂ Injection Wells Ready

Project Overview

In January, the Porthos project reached a significant milestone with the completion of offshore work on wells in the North Sea. Four former gas production wells were converted into CO₂ injection wells, while three others were sealed and removed. This prepares the site for CO₂ injection and storage beneath the seabed.

Technical Modifications

The wells, connecting the P18-A platform to depleted gas fields, required technical modifications for CO₂ injection. A new production system was installed to monitor pressure and temperature. The conversion process involved replacing worn sections and resolving technical challenges like corrosion.

Conversion Process

The conversion was executed in phases, starting with securing the reservoir with an isolation plug. Wells were filled with liquid for safety and cleaning, followed by the removal of existing installations. Suitable materials were reused in other projects. Each well's condition was checked using ultrasonic logging before installing new pipes and equipment.

Execution and Safety

The Valaris123 jack-up drilling rig facilitated the conversion, operating 24/7 with its own cranes and power supply. TAQA, the former platform owner, managed the project with multiple specialized parties. The work was completed without incidents, ensuring safety and environmental protection.

Future Plans

With four wells ready for CO₂ injection, the first injection is planned for autumn 2026. Ongoing work on the platform and onshore will continue to support this timeline.