China News Service, Tianjin, May 29 (Reporter Zhang Daozheng) The reporter learned from Tianjin Port Free Trade Zone Enterprise Offshore Oil Engineering Co., Ltd. (hereinafter referred to as "CNOOC Engineering") that with the end of the 12-inch submarine pipeline heading into the sea, by The laying of the submarine pipeline on the south side of the E3 to E2 Lingshui 17-2 project in charge of it was successfully completed in Hainan. The water depth of this construction operation reached 1542 meters, creating a new record of the depth of the Chinese submarine pipeline laying, marking China's deepwater oil and gas resource development A major breakthrough was made.
The construction work ship is "Offshore Oil 201", which is the first self-propelled 3,000-meter deep-water pipe-laying crane designed and built by China in detail. Since its delivery in 2011, "Offshore Oil 201" has successively Breaking the record of laying Chinese sea pipelines more than 20 times. In 2013, during the offshore construction of the Liwan 3-1 project, the first operation of the "Offshore Oil 201" set a record of 1409 meters of water depth, which marked the advancing of the Chinese submarine pipeline into the deep water era.
After a lapse of 7 years, "Offshore Oil 201" once again set a record of operating water depth, marking that China's deepwater pipe laying capabilities are leading in Asia and internationally advanced, laying a solid foundation for China's independent development of deep sea oil and gas resources.
It is understood that the submarine pipeline is the "main artery" of offshore oil and gas transportation, and is hailed as the "lifeline" of the offshore oil and gas production system. The laying of submarine pipes is not only difficult to construct, but also has extremely high requirements on welding technology, equipment capabilities and team coordination capabilities. It is one of the important signs for testing the overall level of a country's offshore oil and gas engineering industry.
In recent years, deep waters have become an important succession area for global oil and gas exploration and development. However, the water environment, seabed stability and rock strength of sedimentary strata in deep seas are significantly different from those in shallow waters. They are affected by unstable seabed, large slope, low rock strength, Due to low temperature and other factors, with the increase of water depth, the technical difficulty of laying submarine pipelines has increased exponentially. The core technology of laying deep sea pipes over 1500 meters has been monopolized by a few international petroleum engineering companies.
The reporter learned in the interview that the Lingshui 17-2 project is China's first deep-sea oil and gas development project with a water depth of more than 1500 meters. Facing the dual challenges of technology and experience, CNOOC Engineering has carefully planned and established more than 70 domestic and foreign first-class A technical team composed of engineering experts worked together to carry out key technical research, fill in a number of technical gaps such as "the initial laying of the deep-end submarine pipeline at the free end and hang down to connect the gravity anchor", and scientifically formulate more than 30 deep-water construction technical solutions to clean up offshore construction Technical obstacles.
In addition, in the face of the first "big test" of the 1500-meter deepwater operation, CNOOC Engineering carefully planned and upgraded the system hardware and software of "Offshore Oil 201" in advance, and adjusted and reviewed the key equipment custody racks and operation line rollers.
At the same time, CNOOC Engineering strictly implements the epidemic prevention requirements of CNOOC and Tianjin Port Free Trade Zone Management Committee, and formulates a "one ship, one policy" epidemic prevention and control plan to ensure the prevention and control of epidemic conditions and offshore operations. It is worth mentioning that in the first pipe laying operation, the construction team optimized the pipe laying process, strengthened the heatstroke prevention and cooling measures, and completed the operation task 5 days in advance, accumulating valuable experience for China's deepwater submarine pipeline laying.
The relevant person in charge of CNOOC Engineering said that since the completion of the first submarine pipe laying operation in the 1980s, CNOOC Engineering has accumulated rich technical experience in the offshore construction practice for more than 30 years, and has continued to tackle core technologies. Great progress has been made in construction technology and equipment capabilities.
Up to now, CNOOC has completed the laying of more than 2,200 kilometers of submarine pipes, which is equivalent to the distance from Beijing to Guangzhou. The submarine pipe laying specifications have also achieved full-size coverage from 2 inches to 48 inches, covering single-layer pipes and double-layer pipes Almost all types of subsea pipes, such as sub-main pipes, are of great significance for improving the laying capacity of China's subsea pipes and accelerating the realization of leapfrog development of the offshore equipment industry of CNOOC and even the Tianjin Port Free Trade Zone. (Finish)