InterMoor, an Acteon company, has completed its first permanent mooring work in Lufeng oilfield in the South China Sea. This project was also the company’s first for Chinese installation contractor China Offshore Oil Engineering Co. Ltd.
The Nanhai Sheng Kai floating, storage and offloading unit (FSOU) has been in service since 1992, far beyond its original design life of 12 years. Consequently, its subsea mooring system had begun to deteriorate and corrode. To facilitate continuing production from Lufeng field and the expansion of the LF 13-2 oilfield, the fields’ operator, CNOOC Ltd, is extending the service life of the FSOU for another 15 years by upgrading and relocating its mooring system to LF 13-2 oilfield.
InterMoor’s work over five months involved project management, engineering, procurement and installation for a new buoy turret mooring system for the upgraded Nanhai Sheng Kai FSOU in LF 13-2 field; and installation of a new 8-in. flexible flowline and riser between the buoy turret mooring system and the LF 13-2 wellhead platform. Additional scope included temporary replacement of the buoy turret mooring system in LF 13-1 field to accept the interim Nanhai Kai Tuo FSOU.
InterMoor was assisted on the project by three sister Acteon companies: OIS, which provided project management support and offshore personnel; 2H offshore, which provided riser installation engineering; and Aquatic, which supplied offshore personnel and equipment for deploying the flexible riser.
Martin Kobiela, Operations Director, InterMoor Pte Ltd, said, “Owing to the diverse nature of the offshore work scope the main challenge was interfacing with the main installation vessel, the Maersk Attender, to accommodate the project requirements.”
InterMoor’s expertise in back-of-the boat solutions played a key part in executing the project efficiently and successfully. The company also designed special devices to handle the jacketed spiral strand wires. With no large storage reels on the anchor-handling tug supply vessel, the jacketed spiral strand wires were spooled on the main winches using special winch adapters.
InterMoor and OIS developed procedures so that simultaneous operations could be performed offshore while working with divers, remotely operated vehicles and the anchor-handling vessel in close proximity to the buoy turret mooring system.
“We were selected for this project because of our competitive expertise and ability to provide all resources and services within the tight time frame. All the work was carried out safely, efficiently and ahead of schedule. We are pleased to have had the opportunity to work closely with China Offshore Oil Engineering for the first time,” Kobiela concludes.