The installation of the oil and gas pipeline for the second phase of the "Deep Sea One" project has been completed. The submarine | pipeline | oil and gas
On the noon of June 22nd, in the Lingshui area of Hainan, with the termination of head entry, the key control project of the second phase of the "Deep Sea One" atmospheric field project - the laying of a 20 inch diameter and total length of about 115 kilometers of submarine oil and gas long-distance pipeline - was completed, marking an important breakthrough in China's deepwater long-distance pipeline construction capacity and deepwater equipment technology.
The second phase of the "Deep Sea No.1" project is about 130 kilometers away from Sanya, Hainan, located between the Yacheng 13-1 gas field and the "Deep Sea 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 "Deep Sea 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.
Submarine pipelines are the lifeline for ensuring the smooth transportation of offshore oil and gas. The Phase II project of "Deep Sea One" is located in a deepwater high-pressure gas field. The oil and gas extracted from the formation have complex composition, high temperature, and high pressure. Conventional materials of submarine pipes cannot meet production needs. China National Offshore Oil Corporation (CNOOC) has for the first time applied the combination scheme 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 "Deep Sea One" Phase II project.
This underwater pipeline is specially designed for the mixed transportation of high-temperature, high-pressure, and strongly corrosive oil and gas flow. The pipeline is designed with a pressure of up to 38.8 megapascals 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 China's offshore pipelines. "Hou Jing, Chief Engineer of the Phase II Project of Deep Sea One, introduced: 'We have collaborated with domestic manufacturers to optimize chemical composition, adopt high-precision rolling technology and advanced heat treatment technology, meet the requirements of high strength and high toughness indicators, achieve the full process of research and development and manufacturing localization, and provide strong support for China's ultra deep water oil and gas development equipment.'"
![The installation of the oil and gas pipeline for the second phase of the "Deep Sea One" project has been completed. The submarine | pipeline | oil and gas](https://a5qu.com/upload/images/fe4ab4b5be098841c88b07e862aff45f.jpg)
This is the first 3000 meter deep-water pipe laying crane ship in Asia, "Offshore Oil 201".
The geological conditions in the sea area where the Phase II project of Deep Sea One is located are very complex, which poses great challenges to engineering design, ship equipment capabilities, and offshore installation technology. Guo Qing, the general contracting project manager of the "Deep Sea No.1" Phase II project of CNOOC Engineering, introduced that the project team has successfully solved world-class submarine pipeline engineering technical problems such as ultra long and ultra high suspension spans through extensive calculation and analysis. They have also made adaptive modifications to the key equipment of the main operating ship "Offshore Oil 201", independently developed the first set of fully automatic welding equipment technology for large-diameter and large-wall thick offshore pipelines in China, achieved more than 10 technological breakthroughs, and created a record of 2.65 kilometers per day for the laying speed of 20 inch deep-water pipelines during construction.
It is reported that China has laid over 9000 kilometers of offshore oil and gas pipelines. After years of technological research and development, China has built a pipeline laying vessel equipment represented by the first 3000-meter deepwater pipeline laying crane ship in Asia, "Offshore Oil 201". It has independently mastered core key technologies such as the design, efficient installation, emergency response, and maintenance of submarine oil and gas pipelines under harsh sea conditions and complex landforms. Its operational capabilities have spanned from shallow and deep water to ultra deep water, and it has achieved full coverage of mainstream submarine pipeline types such as single layer, double layer, counterweight, sub main pipe, and steel suspension chain riser.