Subsea 7 has completed its Gulf of Mexico Marathon Droshky project – the first project to be delivered utilising its new North American spoolbase at Port Isabel, Texas.
The project, managed from Subsea 7's Houston office, involved the fabrication and installation of two 20.3cm flowlines totalling 58km for Marathon Oil Corporation's Droshky field development.
Pipeline production took place at the Port Isabel Spoolbase between June and October 2009 and offshore operations commenced afterwards with the arrival of the 'Seven Oceans' pipelay vessel, to start spooling the first of three offshore pipelay campaigns.
In addition to the fabrication and installation of the pipeline for the Droshky project, Subsea 7 also conducted the engineering, fabrication and installation of two 580-metre 20.3cm risers, four termination pipeline end structures and two initiation pipeline end manifolds. The scope also included metrology, fabrication and installation of three rigid jumpers as well as pre-commissioning of the entire Droshky pipeline system.
The Droshky field development, with a water depth of 900 metres, serves five subsea wells via two 29km insulated pipelines. The development is a life extension of the Bullwinkle platform, which has seen decreasing production in recent years. This is Marathon Oil Company's first Gulf of Mexico project in 14 years as well as its first ever deepwater Gulf of Mexico project.
The Port Isabel spoolbase was officially opened in July 2009 and enables Subsea 7 to offer a deepwater rigid pipelay service to clients in the North America region. Located in Port Isabel, approximately eleven kilometres from Brownsville, Texas, it is 1.5km in length, including 1.2km stalk rack and 0.3km fabrication building.
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