Detailed Engineering for Offshore Carbon Storage

Technip Energies has been awarded a detailed engineering contract for PTTEP’s Arthit Carbon Capture and Storage (CCS) project, advancing offshore CO₂ processing and injection infrastructure in the Gulf of Thailand.

Advancing CCS deployment in Thailand
The Arthit CCS project is led by PTTEP and is intended to serve as a pilot for building national expertise in carbon capture and storage. The project aligns with Thailand’s government policy on greenhouse gas reduction and is recognized under the Nationally Determined Contribution (NDC) Action Plan on Mitigation 2021–2030.

By establishing an operational CCS reference, the project aims to support broader adoption of carbon capture technologies across the country’s energy sector.

Project scope and capacity targets
The Arthit CCS facilities will leverage existing offshore infrastructure at the Arthit field while adding new processing and injection capabilities. Once operational, the project is expected to ramp up gradually to a CO₂ storage capacity of approximately 1 million tonnes per year.

Using existing platforms reduces the need for greenfield construction and limits additional offshore footprint, a common approach in early CCS projects to control cost and execution risk.

Engineering scope and brownfield integration
Technip Energies’ scope covers detailed engineering for new CCS processing units and CO₂ injection facilities, along with brownfield modifications to the existing Arthit Central Processing Platform. Brownfield CCS integration typically requires careful engineering to address space constraints, interface management, and operational continuity while retrofitting new systems onto live assets.

The detailed engineering phase translates earlier conceptual and front-end designs into construction-ready specifications, including equipment layouts, piping, and integration with existing process and utility systems.

Continuity from front-end design to execution
The award follows Technip Energies’ earlier involvement in the project, during which it delivered both the Pre-FEED and FEED phases between 2022 and 2023. Continuity across these phases supports design consistency and reduces the risk of rework during detailed engineering and subsequent construction.

Such phase continuity is particularly relevant for CCS projects, where process design, compression, dehydration, and injection parameters must remain aligned with subsurface storage assumptions and regulatory requirements.

Role within the regional CCS landscape
The Arthit CCS project represents an early step in developing an offshore carbon storage value chain in Southeast Asia. By combining pilot-scale capacity with existing offshore assets, the project provides a practical pathway for testing CCS technologies under regional operating conditions.

Within the broader context of industrial decarbonization and offshore energy transition, the project illustrates how detailed engineering and brownfield integration are being used to move CCS from policy frameworks into deployable infrastructure.