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    Ulstein unveils heavy well intervention vessel

    Vessel & ROV News // October 14, 2015

    The DX105 is intended for well intervention in deep water.

    Ulstein and Herrenknecht have unveiled their vision of a heavy well intervention vessel, the Ulstein DX105.

    The DX105 features the HVG Terra Invader 750 drill tower and is designed for intervention in water depths of up to 2,500m.

    "The integration of the Herrenknecht equipment resulted in a compact, fully integrated vessel design, specifically aimed at cost efficiency in medium and heavy well intervention operations," said Ulstein.

    "The large, free work deck with direct access to the moonpool allows the vessel to carry a range of additional well equipment, such as coiled tubing equipment and wireline equipment. it also enables the vessel to store multiple Xmas trees and other subsea equipment along with cementing equipment and store extra drill pipes, risers and casings. The large deck also enable the vessel to store well testing equipment.

    The HVG drill tower consist of an A-frame structure, allowing for easy access to the drill floor. “By using an automated horizontal racking system, a light substructure could be realized, which in combination with the weight saving A-frame solution resulted in a lower CoG,” said Dennis Vollmar of Herrenknecht Vertical. He noted that this improves the operational envelope of the vessel.

    “Over the last decade, deepwater drilling has taken a flight, meaning that in the near future wells in deep water will need servicing and maintenance,” said Bram Lambregts, deputy director at Ulstein Design & Solutions BV. “Its higher payloads and mobilization speed compared to semi-submersibles ensure that the DX105 is less dependent on nearby infrastructure. This is of great importance for well intervention operations in remote areas and harsh environments."


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