Abu Dhabi-based GMS has secured approval from classification society ABS for an innovative concept it has developed with Dwellop for vessel-based well intervention services.
The innovative cantilever system it has introduced has been installed on the self-elevating support vessel GMS Evolution.
Said to be an industry first, GMS Evolution is fitted with a removable skidding cantilever system, installed with a well workover unit designed in partnership with Dwellop AS. The novel removable cantilever system provides an efficient and versatile vessel for well services, according to GMS.
The innovative combination of a self-propelled jack-up with a removable cantilever and workover unit is not only the first self-elevating unit to secure ABS certification, but also the first mobile offshore drilling unit of its kind in the industry.
In addition to the workover unit, which can be skidded over a platform or subsea well, GMS Evolution has a speed of more than 8 knots, DP2 dynamic positioning system, accommodation for 150 personnel and cranes including one of 200-tonnes capacity.
The company says installing the cantilever unit on the self-elevating vessel gives it the well intervention capability of a rig and the marine efficiency of a vessel. The new unit is capable of undertaking ESP replacement, workover, well recompletion, change of use, slot recovery, slide recovery and plug and abandonment. The system can provide fast, accurate cantilever action 15 m and up to 8 m in the transverse direction, skidding at 1 m per minute. This means that the drill floor can be centred over the furthest slot within 30 minutes.
“Our new cantilever system will give clients a range of options in the way they use our barges to service their offshore assets. This system offers cost-effective solutions for work that has traditionally been performed by more expensive non-propelled drilling rigs,” said GMS chief executive Duncan Anderson.
Mr Anderson said it has “opened up a new area of the market that had previously been predominantly served by drilling rigs,” at a greater cost to operators. The new cantilever system will be able to replace them.