InterMoor completes Delta House hook-up in Gulf of Mexico

Offshore staff

HOUSTON – InterMoor, an Acteon company, has successfully installed and hooked up a permanent mooring system for the Delta House field floating production system (FPS) in the Gulf of Mexico.

Project developer LLOG Bluewater, a joint venture between LLOG Exploration and Blackstone Energy Partners and its affiliates, contracted InterMoor to design, fabricate, and install 12 suction pile anchors; to install 12 preset chain/polyester mooring lines; and to hook up the FPS in 4,450 ft (1,372 m) of water in Mississippi Canyon block 254, 130 mi (209 km) southeast of New Orleans.

The company fabricated the suction piles at its 34-acre facility in Morgan City, Louisiana. The piles, which were used as permanent anchors for the project, are 85 ft (26 m) long, 16 ft (5 m) in diameter, and weigh about 165 metric tons. Installation began in 2Q 2014 and was followed by the hook-up in 3Q.

One of the challenges of this deepwater installation was the use of a prescribed anchor-handling vessel, the Joshua Chouest, on long-term charter to the LLOG drilling department. Because the mooring system was procured early on in the design process, it was necessary to find a solution that would use the selected vessel and extend the vessel capabilities beyond what has previously been done with this class of vessel in terms of mooring component size.

Todd Veselis, general manager, Permanent Moorings, InterMoor, said: “Fixing two elements, the vessel and the mooring components, in the design, independently of one another, was challenging. However, working closely with the suppliers and manufacturers in an iterative process meant that we could ensure equipment was optimized for the application and the project was successful.

“As permanent mooring systems get larger and larger, utilizing traditional anchor-handling vessels for the installation is proving more and more challenging. Flexibility, adaptability, and innovation are critical to extending the capabilities of the existing fleet of anchor-handling vessels to keep pace with larger mooring components, to maximize returns and deliver projects on time and within budget constraints.”

The Delta House mooring system was deployed and installed safely and on time, without incident. The hook-up system was successfully connected under high loads, with close attention to tolerances and connection interfaces.

The FPS is designed for a peak capacity of 100,000 b/d of oil and 240 MMcf/d (6.8 MMcm/d) of gas. First production from the facility is expected in the first half of 2015.


Delta House FPU mooring system
(Photo courtesy InterMoor)

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