【Ten Years of Great Progress in Chemical Technology】066-2023: China’s First Offshore Carbon Dioxide Sequestration Pilot Project Put into Operation
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Over the past decade, chemical technology has seen remarkable development; let’s celebrate the prosperity and strength of modern China. By contributing our ideas, we can foster greater engagement among everyone. HaiChuan becomes even more wonderful with your participation – we invite everyone to join in the forum discussions. Everyone should prioritize safety and know how to handle emergencies. ********************************************* On June 1st, China’s first offshore carbon dioxide storage demonstration project was put into operation in the eastern part of the South China Sea, where carbon dioxide generated as a byproduct of oil extraction is now being injected on a large scale into underground layers. The successful operation of this project indicates that China now possesses a complete set of technologies and equipment for the capture, treatment, injection, storage, and monitoring of carbon dioxide at sea, filling the gap in China’s capabilities related to carbon dioxide storage at sea. This is of great significance for China’s efforts to achieve its goals of carbon peak and carbon neutrality.
At 9:30 a.m. that day, on the Enping 15-1 platform, about 200 kilometers southwest of Shenzhen, equipment such as high-carbon crude oil production wells, production and processing systems, carbon dioxide compressors, and molecular sieve dehydration units was started sequentially. The carbon dioxide generated as a byproduct of oilfield development was captured, separated, and pressurized to a supercritical state where it is a mixture of gas and liquid. It was then injected back into the saline water layer, located 3 kilometers away from the platform and more than 800 meters deep in the seabed strata, at an initial rate of about 9 tons per hour through a carbon dioxide reinjection well. According to Deng Changhong, deputy general manager of CNOOC Shenzhen Branch, the formation into which carbon dioxide is injected has a \"dome\"-shaped geological structure, which is similar to an inverted \"giant bowl\" buried underground. This structure provides natural sealing properties, enabling the long-term and stable storage of carbon dioxide. The project is expected to sequester 300,000 tons of carbon dioxide per year, with a cumulative total exceeding 1.5 million tons, which is equivalent to planting nearly 14 million trees.
It is reported that the Enping 15-1 platform is the largest offshore crude oil production platform in Asia. It came online in December 2022, operates at a water depth of around 80 meters, and the oil field complex it is part of can produce over 7,000 tons of crude oil per day at its peak. The carbon dioxide content in the associated gas from the Enping 15-1 oil field is as high as 95%. If developed using conventional methods, carbon dioxide will be brought to the surface along with the crude oil, which not only causes corrosion to offshore platform facilities and subsea pipelines but also increases China’s carbon dioxide emissions. In line with the global trend toward a lower-carbon development in the energy industry, CNOOC has implemented a carbon dioxide sequestration demonstration project at the Enping 15-1 oil field. It has carried out research and applied key technologies related to geological reservoirs, drilling and completion processes, as well as project integration, in order to develop a safe and controllable system for carbon dioxide capture and sequestration. The project has helped overcome a range of challenges, including limited operational space at sea, the highly humid and saline marine environment, and the difficulties associated with drilling deep-shaft horizontal wells. “We have innovatively applied 7 domestically first-developed technologies to independently develop and manufacture China’s first set of offshore carbon dioxide storage systems, as well as to design and construct China’s first offshore carbon dioxide reinjection well, thereby achieving zero emissions of carbon dioxide. ”Wan Nianhui, general manager of the Enping oil field of CNOOC, explained.
China’s marine sedimentary basins are widely distributed, have large stratigraphic thicknesses, and numerous traps, providing favorable geological conditions for carbon dioxide sequestration. In January this year, the Ministry of Natural Resources released for the first time the assessment results on the potential for geological storage of carbon dioxide at sea, estimating the storage capacity to be 2.58 trillion tons. The operation of the Enping 15-1 oil field carbon dioxide sequestration demonstration project has established the technical foundation and practical conditions for future carbon transfer from land to the sea, providing a viable solution for rapid carbon reduction in the Guangdong-Hong Kong-Macao Greater Bay Area and across the country.
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