Haiji One, Asia's first 300-meter deepwater jacket designed and built independently by China National Offshore Oil Corp, was successfully hauled onto a barge on Tuesday.

The jacket is a major breakthrough in jacket design and a milestone in the construction of a super large offshore oil and gas platform in China.

The jacket completed construction in Zhuhai, Guangdong province, on March 1 and is expected to be installed in late March.

It will serve the Lufeng 15-1 oil field platform located in the South China Sea.

When put into operation in September, it will further improve the country's energy supply and guarantee China's energy security, said its operator CNOOC, the country's top offshore oil and gas producer.

A jacket serves as the foundation of the offshore oil and gas platform. Used to support the huge body and tonnage of an offshore platform, it is the most widely used offshore oil and gas development equipment globally.

zhengxin@chinadaily.com.cn