Located about 140 mi (225 km) southeast of New Orleans in Viosca Knoll block 999, the Stonefly development calls for a two-well subsea tieback to the Ram Powell platform via 60,000 ft 6-in. pipeline at water depths ranging from 3,300 to 4,100 ft (1,006 to 1,250 m).
The scope of work includes project management, installation engineering, subsea structure and spoolbase stalk fabrication, and installation of the subsea infrastructure. McDermott will also design, fabricate, and install a steel catenary riser, a pipeline end manifold, and two in-line sleds.
Structure design and installation engineering began this month in McDermott’s Houston office. TheNorth Ocean 105 vessel is expected to install the subsea infrastructure in 3Q 2019.