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From "carbon sequestration into the sea" to "carbon capture and oil recovery", China's first offshore CCUS project has been put into operation

CNOOC announced that China's first offshore carbon dioxide capture, utilization and storage (CCUS) project was put into use on the Enping 15-1 platform in the the Pearl River Mouth Basin. The carbon dioxide associated with oilfield development is captured, purified, and pressurized to a supercritical state. Through a reinjection well, it is precisely injected into underground oil reservoirs at an initial rate of 8 tons/hour, which not only drives crude oil production but also achieves carbon dioxide sequestration, creating a new model of ocean energy recycling that uses carbon to drive oil and oil to fix carbon.

The Enping 15-1 platform is currently the largest offshore crude oil production platform in Asia, located about 200 kilometers southwest of Shenzhen, with an operating water depth of about 90 meters. The developed oilfield group has a peak daily crude oil production of over 7500 tons. Enping 15-1 oilfield is a high carbon dioxide oilfield. If developed in a conventional manner, carbon dioxide will be extracted from the surface along with crude oil, which will not only cause corrosion to offshore platform facilities and subsea pipelines, but also increase carbon dioxide emissions.

Carbon dioxide capture, utilization, and storage are emerging technological means for low-carbon and efficient development of fossil fuels. At present, there are 65 CCUS commercial projects worldwide, but most of them are concentrated on land, with only a few offshore projects.

China National Offshore Oil Corporation (CNOOC) has identified the construction of CCUS demonstration projects as one of the main measures for energy conservation and carbon reduction during the 14th Five Year Plan period. Over the course of four years, CNOOC has conducted research on key topics such as geological reservoirs, drilling and completion, and engineering integration, resulting in more than 10 domestically pioneering technologies. Among them, the Enping 15-1 oilfield carbon dioxide storage demonstration project, which was first put into operation by CNOOC in June 2023, has cumulatively injected nearly 200000 tons of carbon dioxide, providing a feasible solution for rapid carbon reduction in the Guangdong Hong Kong Macao Greater Bay Area and even the whole country.

Wan Nianhui, General Manager of the Enping Oilfield Operation Area of China National Offshore Oil Corporation, said, "The successful operation of this project has achieved the full chain upgrade of China's offshore carbon dioxide capture, utilization, and storage equipment technology. In the next 10 years, it will inject over 1 million tons of carbon dioxide on a large scale and drive an increase in crude oil production by 200000 tons. This is of great significance for ensuring national energy security and promoting the achievement of carbon peak and carbon neutrality goals." In the future, with further equipment upgrades, the carbon dioxide injection rate will be increased to 17 tons/hour, and the peak single well oil production increase will reach 15000 tons/year, with stronger capacity for increasing production and reducing carbon emissions.

The carbon dioxide injection well is a "green channel" connecting offshore platforms and underground oil reservoirs. China National Offshore Oil Corporation (CNOOC) adopts an economically efficient model of "new use of old wells+layered gas injection", saving drilling costs of over 10 million yuan and achieving completion 7 days ahead of schedule. At the same time, we have independently developed multiple core technologies such as the anti carbon dioxide corrosion cement slurry system and the "liquid control intelligent fine injection+distributed fiber optic monitoring" process, effectively ensuring the sealing and stability of the wellbore.