PRODUCTION • PROCESSING • HANDLING
out through the rear side of the Capjet. A solid track record of approximately 10,000km of trenched product has so far been achieved by the three Capjet machines operated by Nexans.
FLOW ASSURANCE Oil and gas exploration and production is moving towards harsher environments, such as deeper water further from shore with longer subsea tie-backs. Tis is causing new potential flow assurance challenges for operators, particularly in deep water where low temperature and high pressure at the ocean floor increases chances of hydrate and wax formation, blocking the flow of oil and gas. It is common to prevent hydrate and wax formation by injecting chemicals into the well stream but this is not always the most beneficial method seen from a technical, cost and environmental perspective. Valuable space topside and logistics for the chemical processing equipment is very costly. To find a better
solution, Nexans, Statoil and the research organisation Sintef created the DEH (direct electrical heating) solution – an economically and environmentally friendly solution. By transmitting electric current through the flowline, DEH heats the flowline from ambient temperature above the temperature at which hydrate and wax formation begins. Tis prevents a blockage and maintains fluid temperature during shutdowns. A great example of this in action is at the Shaz Deniz field, located in the Azerbaijan sector of the Caspian Sea. Tis is the world’s most challenging and largest DEH project to date, with a total of 130km of the cable system supplied to provide flow assurance for 10 subsea flowlines.
Te DEH solution has been applied
to 30 flowlines worldwide. Nexans has supplied 24 of them to projects for Statoil, Chevron and BP in Norway, Angola/ Congo Brazzaville and Azerbaijan – six new systems will be installed in the next two years.
Termination work being done on an umbilical
IN SUMMARY Umbilicals and submarine power cables play a key role in subsea oil and gas developments. Nexans is committed to the future development of umbilical technology through a combination of design, engineering and manufacturing capabilities with rigorous testing, installation and commissioning. l
Ragnvald Graff is with Nexans Norway.
www.nexans.com
www.engineerlive.com 17
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