Sea Technology

APR 2013

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FSOU Mooring, Riser System Upgrade Extending Service Life of FSOU in China���s Lufeng Field By Shaik Baba I nterMoor (Houston, TexAs part of the project, as) and Offshore Instalprocedures were devellation Services Ltd. (Noroped that enabled opwich, England), or OIS, erations to be performed worked together on a foatsimultaneously offshore, ing storage and offoading while working with divunit (FSOU) mooring and ers, ROVs and the anchorriser system upgrade at handling vessel in close Lufeng feld for Chinese proximity to the buoy turinstallation contractor ret mooring system. Offshore Oil Engineering Co. Ltd. (COOEC) of Mooring Installation Tianjin, China. The Lufeng The overall work scope feld Nanhai Sheng Kai for the project involved (NHSK) FSOU mooring temporary replacement and relocation project was of the buoy turret moorundertaken in the South ing system at well LF China Sea, 370 kilometers 13-1 to accommodate the offshore Hong Kong, ChiNanhai Kai Tuo (NHKT) na, over six months from The buoy turret mooring system for the Lufeng NanHai Sheng Kai. FSOU and enable conMarch to August 2012. tinuing production from The NHSK FSOU was moored with a single-point moorthe feld throughout the project; project management, engiing in a water depth of 142 meters using a disconnectable neering, procurement and installation of a new buoy turret buoy turret-mooring system by SOFEC Inc. (Houston, Texmooring system for the upgraded NHSK FSOU at well LF as). The existing mooring system at well LF 13-1 had entered 13-2; and installation of a new 8-inch static fow line (1,687 service in 1992 and had been operational far beyond its meters) from Technip (Paris, France) and an 8-inch dynamic design life of 12 years. The system was showing signs of riser (412 meters), also from Technip, between the buoy turdeterioration and corrosion. ret mooring system and the LF 13-2 wellhead platform. The feld operator, CNOOC Ltd. (Hong Kong, China), The interim buoy turret mooring system replacement inplanned to extend the service life of the FSOU for another volved disconnecting, by ROV���Oceaneering International 15 years by refurbishing it, and upgrading and relocating Inc.���s (Houston) Magnum Plus dual-manipulator 170-horseits mooring system to well LF 13-2. This would enable propower work-class ROV and Millennium Plus dual-manipuladuction from Lufeng feld to continue in a safe and reliable tor 220-horsepower heavy work-class ROV���the buoy from manner, and would also support future feld development. the riser and placing it on the seafoor; disconnecting the InterMoor was responsible for all of the mooring-related existing mooring lines and removing the buoy; replacing the activities on the project, including providing a specialist top chains and riser wires for the mooring lines using diver engineering team. OIS took responsibility for project manassistance in hookup; and reinstalling the riser system into agement, including offshore management of the Maersk Atthe buoy for connection to the NHKT FSOU, using an adaptender and the HYSY708, and all riser-related activity. tor end ftting. The InterMoor���OIS project team was assisted by 2H The installation portion of the project had four phases. Offshore (Houston), which provided riser-installation engiThe initial phase involved the installation of eight prelaid neering, and Aquatic Engineering & Construction Ltd. (Abmooring lines, including proof loading anchors up to 296 erdeen, Scotland), which supplied offshore personnel and tons. This was performed following a detailed debris survey equipment for deploying the fexible riser. on the LF 13-2 location. www.sea-technology.com April 2013 / st 13

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