【Ten Years of Rapid Development in Chemical Engineering Equipment】Construction of China’s first 2,000-meter-class ultra-deepwater tree completed between 2023 and 2025

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Give praise and encouragement to the achievements made in China’s chemical engineering technology and equipment; your participation in discussions is the greatest encouragement. **********************【Ten Years of Great Development in Chemical Engineering Equipment】Regular updates and summaries are available; feel free to join the discussions at https://bbs.hcbbs.com/thread-3576046-1-1.html *****************Recently, the first domestically developed 2000-meter-depth ultra-deep water production tree in China was completed in Tianjin. The pressure testing of the hydraulic channels in the tubing hanger system has already been carried out, laying the foundation for the subsequent integration testing of this system with the production tree. As a result, our country has become the third in the world to possess the capability for system integration of this type of equipment. 　　It is understood that this equipment was developed by Offshore Oil Engineering Co., Ltd. (hereinafter referred to as Offshore Engineering). As the core equipment for offshore oil extraction, the subsea tree serves as an important hub that connects the oil and gas production string located several kilometers below the sea surface with the underwater oil and gas transmission pipelines. It functions like an intelligent \"tap\" at the wellhead, controlling the rate of oil and gas extraction while monitoring and adjusting production in real time. It also has the capability to safely isolate oil reservoirs and ensure the safety of operations underground; it is thus an essential infrastructure for building underwater oil and gas production systems. 　　This ultra-deepwater Christmas tree is currently the underwater production tree with the greatest water depth, highest pressure rating, and widest temperature range in China. Its maximum operating depth is 2000 meters, with a rated operating pressure of 10,000 psi (pounds per square inch), which is equivalent to the pressure exerted by a weight of over 700 tons on an area of 1 square meter. The minimum operating temperature is minus 46 degrees Celsius, and its design lifespan is 30 years. 　　Zhang Fei, deputy general manager of CNOOC Engineering’s Special Equipment Division, explained that the production tree contains over 12,000 precision components. The sealing of the oil and gas channels is designed with dual redundancy, and sealing operations involve a large number of components made of both metallic and non-metallic materials. One of the key points in ensuring proper sealing is the precision of the fit between the tubing hanger and the production tree itself; even an error of 0.01 millimeters can lead to oil and gas leaks, resulting in serious consequences. Due to the harsh operating conditions in underwater production trees, as well as the need for an extremely long service life with minimal maintenance, there are very strict requirements regarding the sealing strength of the equipment, the pressure resistance of the materials, and the quality of the manufacturing process. Internationally, only a few companies **possess the relevant core technologies. 　　During the assembly of the production tree, the airtightness test of the central valve assembly is a crucial step. To ensure the airtightness of the product, the project team adopted a method of assembling tank bodies and installing inner liners, successfully manufacturing a 550-ton water tank that provided a stable and reliable testing environment for the Christmas tree central valve assembly. Following a rigorous testing process, the airtightness test of the Christmas tree central valve assembly was successfully completed. 　　During the Spring Festival, the R&D team worked day and night to complete the sequential cleaning of the control pipelines, ensuring they met aerospace-grade cleanliness standards, and to carry out key tests such as pressure testing at 15,000 psi and sealing tests at 10,000 psi. Through multidisciplinary collaborative innovation, the R&D team has overcome key technologies such as the layout design of ultra-deep-water production trees at 2,000-meter depths and module positioning, thereby establishing autonomous capabilities across the entire value chain including design, manufacturing, and testing.