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Offshore Support Journal

Offshore Support Journal

Dutch team develops new jack-up design

Thu 30 Jun 2016

Dutch team develops new jack-up design
Daman and GustoMSC say versions of the DG Jack concept will be suitable for the offshore oil and gas and renewables sectors

Damen Shipyards Group and GustoMSC are collaborating to develop a range of self-propelled and non-self-propelled jack-up platforms for the offshore industry – the DG Jack range. GustoMSC’s managing director Nils van Nood said of the collaboration, “We are very pleased to team up with Damen to provide their clients proven and reliable jack-up solutions. These jack-ups form an expansion of the Damen portfolio targeting the offshore markets in oil and gas, renewables like offshore wind and civil construction. The jack-ups will be based on GustoMSC’s proven designs and will include GustoMSC’s proven jacking systems. As a result of this collaboration, the joint Damen and GustoMSC team is fully aligned to provide an optimised solution covering the complete lifecycle of the units, including the design, construction and delivery as well as service during operational life.”

Damen’s chief commercial officer Arnout Damen said the collaboration between Damen and GustoMSC “represents a considered response to the needs of the offshore industry”. He said the new designs “will provide a bridge between the offshore energy sectors and offer the versatility to carry out multiple and varied tasks safely, efficiently and at competitive rates, in line with market expectations”. The decision to partner up and produce the DG Jack range is based on feedback from the offshore market. DG Jacks will operate across the offshore spectrum in renewable and non-renewable sectors.

Damen’s head of business development Peter Robert explained, “In the oil and gas markets, demand for self-elevating service vessels such as the DG Jack range is driven largely by operation and maintenance (O&M) requirements. Age significantly increases the amount of topside repair, maintenance and refurbishment an operator must undertake for the platform to remain serviceable and compliant. In such circumstances, the DG Jack represents an extremely cost-effective solution. At the same time, shallow-water offshore fields remain a major source of production. With enhanced technology and recovery, combined with the relatively low cost of production compared to deep and ultra-deepwater locations, such sites will ensure a continuing demand for the DG Jack range, particularly at this time of low oil prices.”

William Jacob Management (WJM) has secured an initial contract to complete detailed engineering and design of its mobile offshore support services vessel Moss V. Northport Marine LLC will be the first client to receive delivery of the new concept vessel, scheduled for completion in the first quarter of 2018. Moss V is a heavy-duty jack-up drilling rig, converted to a self-propelled vessel. Potential applications include rigless plugging and abandonment (P&A), construction support, flotel, storm damage repair, decommissioning, wireline, workover, support of a skid-off rig and maintenance. WJM will provide the engineering design and construction management for the conversion and refit of a candidate vessel, several of which have been identified.

By removing pre-existing drilling equipment from the top deck during the conversion, a 10,000 ft2 (930m2) open deck serves to create a utility vessel that allows for the accommodation of a number of different services. The equipment below deck (pumps and tanks) is left in place for potential use in P&A applications. Typically, a standard jack-up rig is equipped with two or three cranes with limited capacity of 10–30 tonnes. Moss V adds a new heavy-duty 500-tonne crane, which extends the vessel’s capability to comfortably handle platform maintenance, coiled tubing offloading, the decommissioning of platforms and the rigless P&A of wells.

Moss V also hosts large living quarters for 85 people, which means it can also jack up next to a platform and be used as a flotel. WJM said Moss V is also a more robust vessel in comparison with smaller, lighter liftboats. “Whereas existing liftboats can only work up to a maximum of 200ft water depth and cannot operate in heavy seas, Moss V is designed for 350–400ft and can endure substantial adverse weather conditions due to its size and weight,” the company said. A 2,000 ft2  (185m2) enclosed machine and welding shop is located on the deck of Moss V. This means that workers can safely perform construction tasks for repairs in an environment shielded from the elements whilst offshore on the vessel. Another feature that enhances the safety of its workers is the inclusion of a helideck so that workers can be safely transported on and off the vessel, eliminating the risks inherent with basket transfer of personnel typically used with smaller liftboats.

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