[Ten years of development of chemical equipment] From 979 to 2023, my country’s longest deepwater oil and gas pipeline was laid
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Chemical equipment has developed greatly in the past ten years. Praise for China's prosperity and strength in the prosperous age. It will be more lively and exciting with everyone's participation. Everyone is welcome to participate in more forum exchanges and discussions. Everyone pays attention to safety and knows how to respond to emergencies. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * On June 22, in the Lingshui waters southeast of Hainan Island, with the end of the head entering the water, the key control project of the second phase of the "Shenhai No. 1" ultra-deepwater gas field - the laying of the 20-inch submarine long-distance pipeline was completed. This is my country's longest deepwater oil and gas pipeline, marking an important breakthrough in my country's deepwater long-distance submarine pipeline construction capabilities and deepwater equipment technology. “The second phase of the Shenhai No. 1 gas field is located between the Yacheng 13-1 gas field and the "Shenhai No. 1" energy station. The maximum operating water depth in the area is nearly 1,000 meters, and the proven geological reserves of natural gas reach 50 billion cubic meters. Once put into operation, the peak annual output of the "Shenhai No. 1" gas field will be increased from 3 billion cubic meters to 4.5 billion cubic meters, making it an important gas source to ensure my country's energy security. In order to develop the second phase of the "Deep Sea One" project efficiently and economically, CNOOC pioneered the oil and gas development model of "underwater production system + shallow water jacket processing platform + deep water semi-submersible platform remote control system".
“On the one hand, we built a new oil and gas production and processing platform in the shallow water area and connected it to the Yacheng 13-1 gas field, and transported the oil and natural gas extracted from the second phase of the "Deep Sea No. 1" project through large-diameter submarine pipelines.； On the other hand, the underwater production system of the second phase of the 'Deep Sea One' project and the control system of the 'Deep Sea One' energy station are connected through the deep sea umbilical cable to achieve remote control. ”Wu Hualin, deputy manager of the deepwater pipe and cable department of the "Deep Sea No. 1" second phase project of CNOOC Hainan Branch, said. Submarine pipelines are the "lifeline" to ensure the smooth transportation of marine oil and gas. “The second phase of the "Deep Sea One" project is my country's first deepwater high-pressure gas field. The oil and gas extracted from the formation have complex composition, high temperature and high pressure. Submarine pipes made of conventional materials cannot meet production needs. For the first time, CNOOC applied the "114-kilometer deep-water large-diameter seamless steel pipe + 1.5-kilometer deep-water bimetallic composite pipe" combination solution in a deep-water environment to build the "main artery" for oil and gas transportation connecting the second phase of the "Deep Sea No. 1" project.
It is reported that this submarine pipeline is tailor-made for "mixed transportation of high-temperature, high-pressure, highly corrosive oil and gas flows". The design pressure of the pipeline can reach 38.8 MPa, and it can transport oil and gas flows with high temperatures of 120 degrees Celsius. The maximum wall thickness reaches 38 mm, setting a new record for the wall thickness of my country's submarine pipelines. “Hou Jing, chief engineer of the second phase of the "Deep Sea One" project, said that CNOOC worked with domestic manufacturers to meet the high strength and high toughness index requirements by optimizing the chemical composition, using high-precision rolling processes and advanced heat treatment processes, and achieved localization of the entire R&D and manufacturing process, providing a strong guarantee for my country's ultra-deep water oil and gas development equipment. As water depth increases, the difficulty of constructing submarine pipeline projects increases exponentially. “The stratigraphic conditions in the sea area where the second phase of the "Deep Sea One" project is located are very complex. There are various complex terrains such as seafloor steep slopes and large areas of sand slopes and ridges. It is the submarine pipeline with the largest water depth span in China, which brings great challenges to engineering design, ship equipment capabilities and offshore installation technology.
According to Guo Qing, the general contracting project manager of the second phase of the "Deep Sea One" project of COOEC, the project team conducted a large number of calculations and analyzes on the suspended spans of submarine pipelines under different geological conditions in response to complex routing conditions, and successfully solved technical problems in world-class submarine pipeline engineering such as ultra-long and ultra-high suspended spans, and also improved the main work vessel "Offshore Oil 201" has carried out adaptive transformation of key equipment, independently developed the country's first fully automatic welding equipment technology for large diameter and large wall thickness submarine pipes, achieved more than 10 technological breakthroughs, and set a domestic 20-inch deepwater submarine pipe laying speed record of 2.65 kilometers in a single day during construction.
It is understood that so far, my country has laid more than 9,000 kilometers of offshore oil and gas pipelines, which is equivalent to the distance between Shanghai and Paris. After years of technical research, our country has built pipe-laying ship equipment represented by Asia's first 3,000-meter deepwater pipe-laying crane ship "Offshore Oil 201", and independently mastered the design and high-tech of submarine oil and gas pipelines under harsh sea conditions and complex landforms. It has a series of key core technologies including efficient installation, emergency response and maintenance technology, and its operating capabilities span from shallow water, deep water to ultra-deep water, and achieves full coverage of mainstream submarine pipeline types such as single-layer, double-layer, counterweight, primary and secondary pipes, and steel catenary risers. With the successful completion of ultra-deepwater submarine pipelines represented by "Deep Sea No. 1", my country's submarine pipeline engineering equipment and technical capabilities have successfully reached the international advanced level.
Great powers value weapons. From now on, we will develop offshore oil on our own, and cooperation is also appreciated.