Well intervention vessel offers storage, weight advantages

Offshore staff

SCHWANAU, Germany – Herrenknecht Vertical and Ulstein Design & Solutions (UDS) have developed a new well intervention vessel design.

The ULSTEIN DX105, which incorporates the HVG Terra Invader 750 drill tower, is for operations in water depths up to 2,500 m (8,250 ft).

UDS says the focus is on cost efficiency in medium and heavy well intervention operations.

The vessel’s large, free work deck, with direct access to the moonpool, allows it to carry a large diversity of additional facilities including coiled tubing and wiring equipment; storage of multiple christmas trees and other subsea items; cementing equipment and storage of extra drill pipes, risers, and casings; and well test equipment.

The drill tower consists of an A-frame structure, said to provide 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 center of gravity,” said Dennis Vollmar of Herrenknecht Vertical. “That improves also the operational envelope of the vessel.”

Bram Lambregts, deputy director at UDS, added: “Its higher payloads and mobilization speed compared to semisubmersibles ensure that the ULSTEIN DX105 is less dependent on nearby infrastructures. This is of great importance for well intervention operations in remote areas and harsh environments, which is further enhanced by applying the proven ULSTEIN X-BOW to increase the operational window of the vessel.”



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