Important breakthrough! Completed in Lingshui Sea Area, Hainan

Tech 2023-06-22 21:19:34 Source: Network

On June 22nd, in the Lingshui sea area in southeastern Hainan Island, with the termination of the head closure and water entry, the key control project of the "Deep Sea No.1" ultra deep water atmospheric field phase II - the laying of the 20 inch submarine long-distance pipeline - was completed

On June 22nd, in the Lingshui sea area in southeastern Hainan Island, with the termination of the head closure and water entry, the key control project of the "Deep Sea No.1" ultra deep water atmospheric field phase II - the laying of the 20 inch submarine long-distance pipeline - was completed. This is the longest deepwater oil and gas pipeline in China, marking an important breakthrough in the construction capacity of China's deepwater long-distance submarine pipeline and deepwater equipment technology.

The second phase of the "Deepsea No.1" project is located between the Yacheng 13-1 gas field and the "Deepsea No.1" energy station. The maximum operating water depth in the area is nearly 1000 meters, and the proven geological reserves of natural gas reach 50 billion cubic meters. After being put into operation, the peak annual production of the "Deepsea No.1" atmospheric field can be increased from 3 billion cubic meters to 4.5 billion cubic meters, becoming an important gas source to ensure China's energy security.

In order to efficiently and economically develop the second phase of "Deepwater No.1" project, CNOOC pioneered the oil and gas development mode of "underwater production system+shallow water jacket processing platform+deepwater Semi-submersible platform remote control system".

On the one hand, we will build a new oil and gas production and processing platform in the shallow water area to connect to the Yacheng 13-1 gas field, and transport oil and natural gas from the second phase of the 'Deepsea No.1' project through large-diameter subsea pipelines. On the other hand, we will connect the underwater production system of the 'Deepsea No.1' second phase project with the control system of the 'Deepsea No.1' energy station through deep-sea umbilical cables to achieve remote control Wu Hualin, Deputy Manager of the Deepwater Pipeline and Cable Department of the Phase II Project, introduced.

Submarine pipelines are the lifeline for ensuring the smooth transportation of offshore oil and gas. The second phase of the "Deep Sea No.1" project is China's first deepwater high-pressure gas field. The oil and gas extracted from the formation have complex composition, high temperature, and high pressure, and conventional materials of submarine pipes cannot meet production needs. China National Offshore Oil Corporation (CNOOC) has for the first time applied the combination plan of "114 kilometers of deepwater large-diameter seamless steel pipes+1.5 kilometers of deepwater bimetallic composite pipes" in a deepwater environment, building the "aorta" connecting the oil and gas transportation of the "Deepsea No.1" Phase II project.

It is reported that this submarine pipeline is specially designed for the "mixed transportation of high-temperature, high-pressure, and strongly corrosive oil and gas flow". The pipeline design pressure can reach 38.8 MPa, and can transport oil and gas flow at a high temperature of 120 degrees Celsius. The maximum wall thickness reaches 38 millimeters, setting a new record for the wall thickness of offshore pipelines in China.

Hou Jing, Chief Engineer of the Phase II Project of "Deep Sea No.1", said that CNOOC, in collaboration with domestic manufacturers, has optimized chemical composition, adopted high-precision rolling technology and advanced heat treatment technology to meet the requirements of high strength and toughness indicators, achieved the localization of the entire R&D and manufacturing process, and provided strong support for China's ultra deep water oil and gas development equipment.

As the water depth increases, the difficulty of constructing submarine pipeline projects increases exponentially. The second phase of the "Deep Sea No.1" project is located in a sea area with complex geological conditions, including various complex terrains such as submarine steep slopes and large-scale sand slopes and ridges. It is the largest underwater pipeline in China with the largest water depth span, posing great challenges to engineering design, ship equipment capabilities, and offshore installation technology.

According to Guo Qing, the general contracting project manager of the "Deep Sea No.1" Phase II project of CNOOC Engineering, the project team has conducted extensive calculations and analyses on the suspended spans of offshore pipelines under different geological conditions in response to complex routing situations. They have successfully solved world-class submarine pipeline engineering technical problems such as ultra long and ultra high suspended spans, and have made adaptive modifications to the key equipment of the main operating vessel "Offshore Oil 201", We have independently developed the first fully automatic welding equipment process for large diameter and thick wall offshore pipelines in China, achieving more than 10 technological breakthroughs. During construction, we have set a record for the laying speed of domestic 20 inch deep-water pipelines of 2.65 kilometers per day.

It is understood that up to now, China has laid over 9000 kilometers of offshore oil and gas pipelines, which is equivalent to the distance of the Shanghai Paris route. After years of technological breakthroughs, China has built a pipeline laying vessel equipment represented by the first 3000-meter deep-water pipeline laying crane vessel in Asia, "Offshore Oil 201". It has independently mastered a series of key core technologies, including the design, efficient installation, emergency response, and maintenance techniques of underwater oil and gas pipelines under harsh sea conditions and complex landforms. Its operational capabilities range from shallow and deep water to ultra deep water, and it has achieved single layer, double layer, counterweight, sub main pipe Full coverage of mainstream submarine pipeline types such as steel suspended chain risers. With the successful completion of the ultra deep water submarine pipeline represented by the "Deep Sea No.1", China's submarine pipeline engineering equipment and technical capabilities have successfully reached the international advanced level.

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Transferred from Hainan Daily client

Source: Hainan Radio and Television Station

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