Portable working deck

1 . A working deck configured to access offshore well heads, the working deck comprising:

a barge having an upper surface, wherein the upper surface of the barge is parallel to a surface of water on which the barge is floating; and

transverse beams fixed to the upper surface of the barge;

wherein:

the working deck comprises at least two cantilever beams attachable on to the transverse beams; and

a work platform comprising removable floor panels for accessing the well heads, wherein the work platform is positioned on the at least two cantilever beams and being movable in a lateral direction of the cantilever beams wherein the transverse beams are oriented perpendicular to a forward direction of the barge and comprise at least one of a track beam and one of a hold-down beam for receiving the at least two cantilever beams, wherein the at least two cantilever beams are able to be moved along the at least one track beam and the hold down beam to change the position of the at least two cantilever beams relative to the barge, wherein the working deck comprises a plurality of stiffening elements for stiffening the hold-down beam and to prevent or limit deformation of the hold-down beam.

2 . The working deck of claim 1 , wherein at least two track beams are in the form of a rail and/or the at least two track beams and one hold-down beam are fixed to the upper surface of the barge and/or the at least two track beams and one hold-down beam are structurally designed to have tracks or rails that allow the cantilever beams to move on them in a lateral direction.

3 . The working deck of claim 1 , wherein the hold-down beam is oriented perpendicular to a forward direction of the barge and/or is designed to limit a length of penetration of the cantilever beams on the barge.

4 . The working deck of claim 1 , wherein the stiffening elements are configured to prevent deformation of the hold-down beam to pending moment and shear forces that act on the hold down beam by providing an opposing moment reaction as well a vertical reaction force to counter the shear forces.

5 . The working deck of claim 1 , wherein:

the at least two cantilever beams are connected with a link beam mounted therebetween.

6 . The working deck of claim 5 , wherein the link beam is configured to define a rigid position of the two cantilever beams relative to each other and/or is configured to ensure that the cantilever beams are oriented parallel to each other.

7 . The working deck of claim 1 , wherein:

the at least two cantilever beams further comprise rollers for rolling on the at least one track beam of the transverse beams.

8 . The working deck of claim 7 , wherein the rollers enable the cantilever beams to roll on the track beams and/or the rollers are configured to withstand high forces and loads.

9 . The working deck of claim 1 , wherein:

the at least two cantilever beams further comprise sliders, for sliding along the hold-down beam of the transverse beams.

10 . The working deck of claim 9 wherein the sliders are made of the same material as the hold-down beam.

11 . The working deck of claim 1 , wherein:

the at least one track beam further comprise C-clamps for holding a position of the at least two cantilever beams on the at least one track beam.

12 . The working deck of claim 1 , wherein the at least two cantilever beams further comprise rails, wherein the work platform can be moved along the rails.

13 . The working deck of claim 1 , wherein:

the work platform further comprises at least one wheel driven by at least one electromotor for moving the work platform on rails of the at least two cantilever beams.

14 . The working deck according to claim 13 , wherein the wheel is positioned on the rails of the cantilever beams for moving the work platform along the cantilever beams in the lateral direction.

15 . The working deck of claim 1 , further comprising:

a gangway positioned on the at least two cantilever beams, comprising a stair member and a length-adjustable platform member.

16 . The working deck of claim 15 , wherein length-adjustable platform member can be adjusted in length in the lateral direction and/or the stair member helps to overcome a height difference between the upper surface of the barge and the work platform.

17 . The working deck of claim 15 , wherein the gangway is positioned onto at least one of the two cantilever beams between the barge and the work platform.

18 . The working deck of claim 1 , wherein:

the barge further comprises a jack-up mechanism for jacking-up the barge above the well heads and for jacking-down the barge to a desired vertical working position.

19 . A method for accessing offshore well heads with a working deck, the method

comprising:

positioning a barge next to the offshore well heads, wherein an upper surface of the barge is parallel to a surface of water on which the barge is floating;

jacking-up the barge to a height above the offshore well heads;

mounting a link beam between at least two cantilever beams;

attaching the at least two cantilever beams to transverse beams fixed to the barge;

positioning a work platform with removable floor panels on the at least two cantilever beams;

electrically connecting at least one electromotor of the work platform;

moving the work platform in a lateral direction to the at least two cantilever beams to a desired horizontal working position by using the at least one electromotor;

positioning a gangway on the at least two cantilever beams between the barge and the work platform;

removing of ones of the floor panels at the work platform for accessing the offshore well heads; and

jacking-down the barge over the offshore well heads to a desired vertical working position.

20 . The method of claim 19 , wherein:

the positioning of the at least two cantilever beams on the transverse beams is carried out in such a way that rollers of the at least two cantilever beams roll on at least one track beam of the transverse beams and a slider of the at least two cantilever beams slides along a hold-down beam of the transverse beams.

21 . The method of claim 19 , further comprising:

fixing the at least two cantilever beams attached to the transverse beams with C-clamps.

22 . The method according to claim 19 , wherein the cantilever beams are dissembled and/or stored in a 40 ft ISO container.

23 . The method according to claim 19 , wherein when the working deck is not used, the transverse beams are oriented and fixed perpendicular to a forward direction of the barge, the cantilever beams, the link beam and the gangway are disposed and secured on an upper surface of the barge in a location reachable with a crane when the barge is moving to the offshore well heads.