Offshore system comprising a rig and a cantilever

An offshore system comprising:

• a rig having a deck supporting structure provided with a deck, said deck supporting structure having a side,
• a cantilever having a rigid cantilever structure with an operational end, said operational end being adapted to receive a mobile drilling station, said rigid cantilever structure having an inner end opposite the operational end and said rigid cantilever structure having one or more cantilever beams in the longitudinal direction of the cantilever,
• wherein the cantilever is mounted on the deck so as to be movable in longitudinal direction of the cantilever, in rotational direction, and in combinations thereof, allowing movement of the cantilever between a retracted position and extended positions wherein the operational end of the cantilever extends over said side beyond the deck supporting structure,
• wherein the rig is provided with a first support rail which extends along said side of the deck supporting structure,
• wherein one or more travelling and swivelling assemblies are arranged between said first support rail and the one or more cantilever beams, each assembly having a lower member which travels over the first support rail, an upper member over which the one or more cantilever beams travel in their longitudinal direction, and a vertical pivot axis swivel between said lower and upper member of the assembly,
• wherein the rig is provided with one or more second support rails that extend over the deck in a direction transverse to the first support rail,
• wherein the system comprises a cantilever inner end carrier device which travels over and engages on said one or more second support rails, and
• wherein the cantilever inner end carrier device is connected via a vertical pivot axis swivel to a connector part of the rigid cantilever structure at or near its inner end to provide a rotation axis at a fixed location relative to the rigid cantilever structure for the rotational motion of the cantilever, the cantilever inner end carrier device holding the cantilever inner end relative to the deck.