Troika is a deepwater (2,700 ft) oil development located in the Gulf of Mexico approximately 150 miles south of New Orleans, Louisiana. The reserves are being recovered through an 8 slot manifold cluster subsea production system in Green Canyon (GC) 200 tied back to the Bullwinkle platform in 1,350 ft water depth in GC 65. Commingled flow from 5 initial wells will be produced to Bullwinkle through two 14-mile long 10-in. diameter pipe-in-pipe insulated flowlines. Well control is maintained with an electro-hydraulic control system through separate electrical and hydraulic/chemical umbilicals.The two 14 mile long flowlines were installed by the bottom tow method in four 7 mile long segments. Each 7 mile segment was fabricated at a beach makeup site, laterally launched, bottom towed 400 statute miles, positioned in the field and connected. Connection to the Bullwinkle platform entailed lifting the riser end to the surface and securing it to the jacket leg in a catenary configuration. Insulated steel pipe jumpers were used to join the 7 mile sections at the mid and subsea manifold end points. This paper presents the design, fabrication and installation of the Troika flowlines.
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