[Haichuan Overseas Engineering] The first batch of offshore underwater core equipment belonging to CNOOC Engineering’s “Qinghai” brand was successfully deployed in the waters off Qatar

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On January 26, the first batch of offshore underwater core equipment units under the “Qinghai” brand of CNOOC Engineering were accurately installed in the waters off Qatar, demonstrating significantly China’s capabilities in the construction and installation of underwater equipment for oil and gas operations at sea. These three underwater units installed this time are ball-passing units, air lift & water injection units, and isolation valve units – all tailored to the conditions in Qatar’s coastal waters. They incorporate a range of innovative technologies such as \"super slow-bend\" designs with 5 times the standard pipe diameter, as well as improved pressure relief monitoring systems, enabling them to carry out critical tasks such as oil and gas transfer, pipeline cleaning, and safety protection under extreme conditions. The sea area where this operation is carried out is densely packed with subsea pipelines; 247 pipeline crossings form a complex network, and there are numerous underwater manifolds and various structures, creating a sophisticated \"steel jungle\" that imposes extremely high demands on installation accuracy, operational safety, and maneuvering procedures. In response, the underwater installation team conducted preliminary field surveys, used 3D scanning technology to recreate the complex seabed terrain, repeatedly analyzed possible construction routes, and optimized the placement of lifting points as well as the force calculations. The \"transportation-installation\" sequential operation mode was adopted: the equipment was loaded onto a ship in Qingdao and transported to the operation area via a anchorage in Qatar, where it was then lowered using the ship \"Ocean Oil 289\". The entire process was carried out seamlessly and efficiently. During the offshore installation phase, the construction team precisely controlled the ship’s ballast system, coordinating the use of cranes and ROVs to lift the skid blocks directly into the water. By using slings and winches, they accurately controlled the orientation of these skid blocks, carefully avoiding underwater pipelines and structures, thereby achieving a placement accuracy of several centimeters.