#Rio de Janeiro #Brazil #CNOOC Limited #Mero4 Project

CNOOC Limited Initiates Mero4 Project Production

CNOOC Limited has proudly announced the commencement of production for the Mero4 Project on May 24, 2025, in Brazil. This project is integral to boosting the company’s presence and operational capacity in the oil and gas market. The Mero Field is strategically located in the Santos Basin pre-salt area, about 180 kilometers offshore of Rio de Janeiro, and operates at impressive depths of 1,800 to 2,100 meters below sea level.

The Mero4 Project employs a standard deep-water pre-salt development model, utilizing a combination of Floating Production Storage and Offloading (FPSO) systems and subsea infrastructure, known as FPSO+Subsea. This approach is designed to optimize extraction efficiency and enhance overall production capabilities. The project plans to establish twelve development wells, which include five dedicated for oil extraction, six for alternating water or gas injection, and one convertible well, a design that supports flexibility and optimization in resource management.

To guarantee high productivity, the wells are outfitted with advanced intelligent well completion technologies. These innovations allow for the remote control of well functions, enabling seamless transitions between production and injection modes right from the platform. This capability is vital for enhancing output and managing the well system effectively.

At the heart of the Mero4 Project is one of the world's largest FPSOs, which was assembled in China before its arrival at the oil field in March 2025. This state-of-the-art FPSO is capable of producing a remarkable 180,000 barrels of crude oil daily, processing up to 12 million cubic meters of natural gas each day, and injecting 250,000 cubic meters of water back into the reservoirs. Collectively, these operations are set to elevate the Mero Field's total production capacity to an impressive 770,000 barrels of crude oil per day.

In alignment with modern environmental standards and sustainability goals, the Mero4 Project incorporates advanced equipment for lower carbon development. Notably, the adoption of the High Pressure Separator (HISEP) technology enables efficient underwater separation of oil from associated gases, allowing for the reinjection of gas back into the reservoir. This process not only boosts production levels but also minimizes emissions, aligning with global energy transition movements.

CNOOC Petroleum Brasil Ltda, a fully-owned subsidiary of CNOOC Limited, holds a 9.65% stake in this venture. The operator, Petrobras, leads the project with a significant 38.6% interest. Other stakeholders include TotalEnergies and Shell Brasil, both holding 19.3% stakes each, and CNPC, which also holds a 9.65% interest. Pré-Sal Petróleo S.A –PPSA represents the Federal Union in non-contracted areas with a 3.5% holding.

In retrospect, the successful launch of the Mero4 Project marks a significant milestone for CNOOC Limited, setting the stage for enhanced production capabilities in Brazil’s offshore oil sector. As the company progresses, it will continue to focus on sustainable practices and cutting-edge technologies that emphasize efficiency and environmental stewardship, positioning itself as a leader in the global energy landscape.

Conclusion

As CNOOC Limited embarks on this exciting journey with the Mero4 Project, the oil and gas industry watches closely. The combination of advanced technology, strategic partnerships, and commitment to sustainability promises a bright future for this landmark initiative. Investors and stakeholders alike are optimistic about the enhanced production capabilities and positive environmental impact that the project heralds for the sector.