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    Statoil robot repairs at depth

    News // April 2, 2007

    The pipeline repair robot works at extreme depths.

    A pipeline repair robot for water depths down to 1,000m is being developed by Statoil.

    The new remotely operated welding machine will undergo testing and final adjustments before being deployed in an emergency response role during the year.

    "We’re getting a lot of enquiries from international oil and gas companies," said Kjell Edvard Apeland, who is heading the development job. "They’re interested in using our robot for pipeline repair and field operations in such areas as the Gulf of Mexico."

    Work on the new device is taking place in Haugesund north of Stavanger, where Statoil’s pipeline repair system (PRS) pool is located.

    The robot will join a number of other remotely operated tools used in deepwater operations, including tie-in of new pipelines in water depths beyond the reach of divers.

    Measuring about 4m long by 2m high, the new welding machine has been developed by Statoil and built in cooperation with external suppliers.

    The robot cuts out the damaged pipe section before welding in a new piece inside an enclosed habitat. Systems are provided for preheating and controlling the habitat atmosphere.

    A submarine pipeline can be damaged by a shipwreck, for instance, or by having a trawl or anchor dragged over it.

    "Many technological experts say that developing such technology and carrying out operations of this kind are more difficult than a moon landing," says Asbjørn Erdal.

    He is manager of the pipeline operation sector, which maintains 8,000km of pipeline and will probably be the biggest customer for the new robot.

    The Norwegian government requires that oil and gas distributors have such equipment available. Regulations restrict diving to a maximum water depth of 180m.

    Statoil currently has a deepwater emergency response system based on remotely operated vehicles which can seal leaks. With the new robot, the group will also be able to weld pipes.

    One application for the device will be pipeline repairs on the Ormen Lange field in the Norwegian Sea, where water depths are 800-1,100m.

     

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