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China's first offshore CO2 storage project officially launched

Author : PCEC

07 September 2021

On August 28, China National Offshore Oil Corporation (CNOOC) announced that China’s first offshore carbon dioxide storage demonstration project was officially launched, which will permanently store more than 1.46 million tons of carbon dioxide in the submarine reservoirs of the South China Sea.

Image: CNOOC
Image: CNOOC

The project is located in the Pearl River Mouth Basin with an average water depth of more than 80 metres. It is an environmental protection project supporting the development of the Enping Gas & Oilfield Group, CNOOC has said. "After the implementation of the carbon dioxide storage project, it is estimated that about 300,000 tons of carbon dioxide can be stored each year, and the accumulated storage of carbon dioxide is more than 1.46 million tons. This is equivalent to planting nearly 14 million trees," Zhang Wei, Deputy General Manager and Chief Engineer of CNOOC Shenzhen Branch, said.

Since the beginning of this year, CNOOC has carried out research on key technologies related to geological oil reservoirs, well drilling and completion, and engineering integration that are suitable for offshore carbon dioxide storage.

"The carbon dioxide associated with the development of the oilfields will be sealed in a saltwater layer at a depth of 800 metres. The saltwater layer has a dome-like structure and is covered with a thick protective layer of mud. The injected carbon dioxide is sealed under the dome, effectively preventing gas from overflowing," Zhang Wei said.

Previously, carbon dioxide storage experiments in China were concentrated in a few areas on land. The successful implementation of the carbon dioxide storage project in the Enping Oilfield Group has opened up new industries and new businesses in China relating to carbon dioxide storage.

CNOOC Chairman Wang Dongjin said that the launch of the Enping Oilfield Group's carbon storage project is an important measure for CNOOC to implement the green development project. CNOOC will steadily advance project construction, accelerate the pace of green and low-carbon transformation, and contribute to China's early realisation of carbon neutrality.


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