Construction of Asia's first deepwater jacket "Haiji 2" completed

Fixed jacket platform is a widely used offshore oil and gas development equipment around the world. It mainly consists of three parts: jacket, leg and upper module. The jacket is equivalent to the "foundation" and is used to support the huge body and huge tonnage of offshore oil and gas platforms.

The average water depth in the operating sea area of ​​"Haiji No. 2" is about 324 meters. The total height of the jacket is 338.5 meters, which exceeds the height of the main building of Beijing International World Trade Center Phase 3. The total weight is 37,000 tons, and the amount of steel used is close to The "Bird's Nest" National Stadium has reached the limit of domestic construction sites, transportation, installation equipment and ships, which has caused a series of technical challenges such as foundation settlement, large-scale hoisting, weight and size control, shipping, transportation, and installation.

In order to "slim down" the jacket to the maximum extent, CNOOC has accelerated the development of new productivity and promoted technological innovation to drive industrial collaborative innovation. "The project team cooperated with domestic steel companies to jointly develop a new 420 MPa ultra-high-strength steel plate suitable for marine engineering." The relevant person in charge of the Engineering Research and Design Institute of CNOOC Research Institute introduced that "Haiji No. 2" applied S420 Grade high-strength steel exceeds 20,000 tons. Through the application of this innovative material, we not only conquered the key technology of lightweight design of ultra-large offshore platforms, but also successfully reduced the weight of the "Haiji No. 2" jacket by 5,000 tons, saving hundreds of millions of yuan. materials and ship modification costs, and has opened up a new path for the large-scale application of domestic high-strength steel in marine engineering.

The sea area where "Haiji No. 2" is located is prone to typhoons, and the wind waves and internal wave currents are huge. The jacket is designed according to the severe sea conditions that will occur once in a century, and it faces unprecedented "world-class" oceans. Engineering Difficulties.

According to the Liuhua Oilfield general contracting project manager of CNOOC Offshore Engineering, the project coordinated high-quality resources to carry out technical research, and fully mastered the independent design and construction of a complete set of technologies for the jacket with a water depth of over 300 meters. It took just over 26 months to complete the construction of the jacket, with key dimensional accuracy controlled within 5 mm.Within the project, it set a new record for the construction speed and accuracy of Asia's ultra-large deepwater jacket. In addition, the project innovatively proposes an "intelligent jacket" design and construction plan, making "Haiji-2" the first in Asia to simultaneously carry an impressed current cathodic protection system, a digital twin system, a marine environment detection system, a submarine environment monitoring system and other multiple systems. The integrated digital jacket not only greatly improves the technical level of digital healthy operation and maintenance of deepwater jackets in my country, but is also of great significance to improving the stability of production and operation of deep-sea oil and gas equipment and intelligent early warning of safety risks and other digital levels.

With the continuous development of offshore oil and gas resources, deep water areas above 200 meters have become an important battlefield for my country's offshore oil and gas development. With the successive completion of deepwater jacket platforms such as "Haiji No. 2", the jacket platform development model is playing an increasingly important role in the development of my country's deepwater oil and gas resources.

"Haiji No. 2" is the first in China to successfully increase the application water depth of the jacket platform to more than 300 meters, which can significantly reduce development investment, engineering construction and production costs, and make a large number of potential deepwater The development of marginal oil fields has become possible, opening up a new path for the economical and effective development of oil and gas resources in my country's medium and deep water areas. Wang Huoping, chief engineer of the Deepwater Engineering Construction Center of CNOOC Shenzhen Branch, said.

It is understood that "Haiji No. 2" is planned to be installed offshore in the near future. After completion, it will serve in Liuhua 11-1/4-1, my country's first deepwater oil field in the Pearl River Mouth Basin. The secondary oilfield development project promotes the revitalization of old deepwater oil fields with a capacity of 100 million tons and injects new energy power into the economic and social development of the Guangdong-Hong Kong-Macao Greater Bay Area.