【Major Industrial Equipment in the Chemical Industry】347 – The First Domestic Deep-Sea Subsea Christmas Tree
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This post was last edited by Desert Fish on 2022-6-15 at 22:14. On June 14, CNOOC announced that China’s first domestically developed deep-water subsea production tree was successfully used in a blowout test of an offshore gas well in Yinggehai, marking its official commissioning. This also indicates that our country now possesses the capability to design, construct, and apply complete sets of deep-water subsea production tree equipment, which is of great significance for ensuring **energy security and promoting the high-quality development of China’s offshore oil industry.
The subsea Christmas tree is a core component of marine oil and gas subsea production systems, and it also serves as the foundation for constructing the production string of subsea oil and gas wells. This equipment weighs 55 tons and consists of over 2,500 components; it has functions such as safely isolating the oil reservoir and ensuring the safety of operations underground. For a long time, only 5 European and American companies worldwide have possessed the technology for designing and building underwater production systems, which has resulted in long procurement cycles, high costs, and difficulties in maintenance for such equipment. The commissioning of this engineering demonstration project for underwater oil and gas production systems further verifies the safety and reliability of these domestically produced equipment, marking a significant step forward in the development of key technical equipment for deep-water oil and gas exploration in China.
Building on the successful seabed installation in May, we utilized this domestically produced deep-water subsea tree to carry out drilling and completion operations for the natural gas development wells around the Ledong platform of the Dongfang 1-1 gas field, achieving excellent results that exceeded expectations. ”According to Yan Bangchuan, the on-site technical supervisor for CNOOC’s projects, the blowout testing operation is the final stage in offshore oil and gas drilling and completion tasks. During the 43-hour blowout testing period, the domestically produced deep-water subsea production tree completed 48 specified tasks, including operating the hydraulic valves, manual valves, downhole safety valves, as well as setting signal parameters for downhole pressure gauges and transmitting data; its performance metrics met the standards of similar foreign products.
Liu Shujie, chief engineer of CNOOC Hainan Branch, said that using domestically produced deep-water subsea production trees saves approximately 27% in costs compared to purchasing imported products, and the cost of such equipment is expected to drop further as mass production begins. Relying on this equipment, it is also possible to effectively develop some oil and gas reservoirs that previously had no economic viability, which holds positive implications for fostering the development of industries related to offshore oil and gas equipment. The reporter learned that an underwater production tree must operate stably for 20 years in an environment with a sea depth of over 500 meters and temperatures below 6 degrees Celsius, under high pressure; it must also be able to precisely control the flow of oil and gas from gas wells. This places extremely high demands on the design quality of such equipment as well as on the construction techniques used.
【Major Industrial Equipment in the Chemical Engineering Sector】346 – China’s self-developed multi-functional modular seabed trencher https://bbs.hcbbs.com/thread-3357256-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum)