Nexans Umbilicals on Jack and St. Malo

At a water depth of 2,100 meters, the Chevron-operated Jack and St. Malo oil and gas fields are the deepest installation to date for Nexans’ innovative power umbilicals that integrate HV power supply and umbilical functions within a single cable cross-section.

The Jack and St. Malo fields are located within 40 km of each other approximately 450 km south of New Orleans, Louisiana. The project comprises of three subsea centers tied back to a hub production facility with a capacity of 170,000 barrels of oil and 42.5 million cubic feet of natural gas per day.

Nexans’ specialized cable and umbilical manufacturing facilities in Halden, Norway, have designed and manufactured the 42 km power umbilical for the two fields in two separate lengths.

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This power umbilical that was, according to Nexans, pioneered by the company, is an innovative design that integrates the functions of power cables and umbilicals in a single cable, enabling a high-voltage (HV) supply to be provided for deepwater projects. A power umbilical includes a number of steel tubes as well as fiber optic elements and signal cables for control and monitoring purposes. By eliminating the need to transport and install a separate power cable, and a control umbilical, the power umbilical significantly reduces transportation and installation costs.

Nexans stated that the design of this complex power umbilical, capable of operating at a water depth of 2,400 meters, and with a design life of 30 years, has required an experienced multi-discipline engineering team to meet the many technical challenges. The two power umbilicals were successfully manufactured and delivered on a transportation barge to a storage location in Mobile, Alabama. The two power umbilicals were successfully installed in July, 2014.

”It has been a pleasure to work with such professional engineers, both from Nexans and Chevron, whose dedication and teamwork has been the key to a successful project”, says Project Manager David Rasmuss of Nexans.

Image: McDermott, Nexans

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