LLOG Exploration Co. LLC, Covington, La., has let a contract to McDermott International Inc. for deepwater subsea pipeline tiebacks and structures from the Stonefly development to the Ram Powell platform 140 miles southeast of New Orleans (OGJ Online, Sept. 4, 2018).
Work includes project management, installation engineering, subsea structure and spoolbase stalk fabrication, and subsea installation of the subsea infrastructure to support a two-well subsea tieback via a 60,000 ft, 6-in. pipeline in 3,300-4,100 ft of water. McDermott also will design, fabricate, and install a steel catenary riser, a pipeline end manifold, and two inline sleds.
The Stonefly development includes the Viosca Knoll 999 area where McDermott is scheduled to use its 50-acre spoolbase in Gulfport, Miss., for fabrication and reeled solutions. Installation of the subsea tiebacks and structures using the North Ocean 105 vessel is scheduled to begin in this year’s third quarter. Structure design and installation engineering began in January.
The Talos Energy-owned Ram Powell tension-leg platform lies in 3,200 ft of water in Viosca Knoll Area, Block 956, and is capable of processing 60,000 b/d of oil and 200 MMcfd of gas.
LLOG’s partners in Stonefly are Beacon Offshore Energy Operating LLC, Houston Energy, Red Willow Offshore LLC, and Ridgewood Energy.