System for moving drilling module to fixed platform

• US 4,938,628 A
• Filed: 10/31/1989
• Issued: 07/03/1990
• Est. Priority Date: 10/31/1989
• Status: Expired due to Fees

• Current Assignee: Smedvig Offshore Europe AS
• Original Assignee: Transworld Drilling Co. (Tronox Holdings Plc)
• Inventors: Ingle, James E.
• Primary Examiner(s): Taylor, Dennis L.
• Assistant Examiner(s): OLSEN, ARLEN
• Application Number:
  US07/429,728
• Time in Patent Office: 245 Days
• Field of Search: 405/196, 405/201, 405/203, 405/204, 405/206, 405/209, 114/265, 414/277, 414/280, 414/282, 414/659, 414/660, 414/661, 414/662
• US Class Current: 405/201
• CPC Class Codes: C22C 38/22 with molybdenum or tungsten
• CPC Class Codes: E02B 17/021 with relative movement between supporting construction and platform
• CPC Class Codes: E02B 2017/006 with lattice style supporting legs

Abstract

A jack-up rig includes a cantilever beam assembly and a drilling module is mounted on the cantilever beam assembly. The jack-up rig also includes means for moving the cantilever beam assembly from the storage position to extended positions wherein a rearward end of the cantilever beam assembly is extended from the jack-up rig. The fixed platform comprises a fixed platform support structure having a drilling module support surface and a beam opening. The jack-up rig is positioned near the fixed platform with the cantilever beam assembly generally aligned with the beam opening in the fixed platform support structure. The cantilever beam assembly then is extended through a portion of the beam opening to an extended position wherein the drilling module is supported on the cantilever beam assembly a distance generally above the drilling module support surface. The jack-up rig then is lowered to a position wherein the drilling module is supported on the fixed platform support structure. The cantilever beam assembly then is withdrawn from the beam opening and moved to the storage position thereby leaving the drilling module supported on the drilling module support surface of the fixed platform support structure. A bridge is movably connected to the fixed platform and the jack-up rig. A floor is removably supported on the cantilever beam assembly generally below the drilling module.

Claims

1. A method for transferring a drilling module from a jack-up rig to a fixed platform wherein the fixed platform comprises legs secured to an ocean floor and wherein the jack-up rig comprises telescoping legs movable in upwardly and downwardly directions and wherein a portion of the jack-up rig is moveable in upwardly and downwardly directions and a cantilever beam assembly having a rearward end and means for moving the cantilever beam assembly from a storage position wherein the cantilever beam assembly is supported generally on the jack-up rig to extended positions wherein the rearward end portion of the cantilever beam assembly is extended distances generally from the jack-up rig, the method comprising:

supporting the drilling module on the cantilever beam assembly;

positioning the jack-up rig near the fixed platform;

moving the cantilever beam assembly with the drilling module supported thereon to an extended position wherein the drilling module is supported generally over a portion of the fixed platform; and

removing the drilling module from the cantilever beam assembly and supporting the drilling module on the fixed platform.

2. The method of claim 1 further comprising:

moving the cantilever beam assembly, after removing the drilling module therefrom, to the storage position.

3. The method of claim 1 further comprising:

connecting a fixed platform support structure to the fixed platform wherein the fixed platform support structure comprises a drilling module support surface; and

wherein the step of removing the drilling module and supporting the drilling module on the fixed platform is further defined as removing the drilling module from the cantilever beam assembly and supporting the drilling module on the support surface of the fixed platform support structure.

4. The method of claim 1 wherein the drilling module includes a lower substructure support surface and wherein the cantilever beam assembly includes a beam support surface, and wherein the method further comprising:

connecting a fixed platform support structure to the fixed platform wherein the fixed platform support structure comprises a drilling module support surface, a front end, a rear end and a beam opening extending through the front end of the fixed platform support structure and extending a distance generally toward the rear end of the fixed platform support structure; and

wherein the step of positioning the jack-up rig near the fixed platform is further defined as positioning the jack-up rig near the fixed platform with the cantilever beam assembly being generally aligned with the beam opening in the fixed platform support structure and with the lower substructure support surface of the drilling module being disposed in a horizontal plane spaced a distance generally above a horizontal plane in which the drilling module support surface of the fixed platform support structure is disposed; and

wherein the step of moving the cantilever beam assembly to the extended position is further defined as moving the cantilever beam assembly with the drilling module supported thereon from the jack-up rig and through at least a portion of the beam opening in the fixed platform support structure to a position wherein the lower substructure support surface of the drilling module or is disposed a distance generally above the drilling module support surface of the fixed platform support structure; and

wherein the step of removing the drilling module from the cantilever beam assembly further comprises;

lowering the jack-up rig in a generally downwardly direction to lower the cantilever beam assembly to a position wherein the lower substructure support surface of the drilling module is disposed generally on the drilling module support surface of the fixed platform support structure and further lowering the jack-up rig to lower the cantilever beam assembly to a position wherein the beam support surface is spaced a distance generally below the lower substructure support surface of the drilling module thereby disconnecting the cantilever beam assembly from the drilling module.

5. The method of claim 4 wherein the drilling module includes a lower beam support surface and wherein the step of removing the drilling module from the fixed platform, further comprises:

extending the cantilever beam assembly from the jack-up rig and through a portion of the beam opening in the fixed platform support structure to a position wherein the lower beam support surface of the drilling module is disposed a distance generally above the beam support surface of the cantilever beam assembly;

raising the jack-up rig in a generally upwardly direction to raise the cantilever beam assembly to a position wherein the beam support surface engages the lower beam support surface and further raising the cantilever beam assembly to a position wherein the lower beam support surface of the drilling module is supported on the beam support surface of the cantilever beam assembly thereby disconnecting the drilling module from the fixed platform support structure; and

moving the cantilever beam assembly with the drilling module disposed thereon to the storage position.

6. The method of claim 5 wherein, prior to extending the cantilever beam assembly, the step of removing the drilling module from the fixed platform further comprises:

positioning the jack-up rig near the fixed platform with the cantilever beam assembly being generally aligned with the beam opening in the fixed platform support structure and with the beam support surface being disposed in a horizontal plane spaced a distance below a horizontal plane in which the drilling module support surface of the fixed platform support structure is disposed and generally below a horizontal plane in which the lower beam support surface of the drilling module is disposed

7. The method of claim 4 wherein the fixed platform support structure comprises a first side and a second side, and wherein, after the drilling module is disposed on the drilling module support surface of the fixed platform support structure, the method further comprises:

restraining movement of the drilling module on the drilling module support surface in directions generally toward the first side of the fixed platform support structure and generally toward the second side of the fixed platform support structure.

8. The method of claim 7 wherein, after the drilling module is disposed on the fixed platform support structure, the method further comprises:

restraining tilting movement of the drilling module on the drilling module support surface and restraining movement of the drilling module in forward and rearward directions.

9. The method of claim 4 wherein the fixed platform support structure comprises a first side and a second side, and wherein, after the drilling module is disposed on the drilling module support surface of the fixed platform support structure, the method further comprises:

restraining tilting movement of the drilling module on the drilling module support surface and restraining movement of the drilling module in forward and rearward directions.

10. The method of claim 4 wherein the step of disposing the drilling module on the drilling module support surface is further defined as movably disposing the drilling module on the drilling module support surface for movement of the directions generally toward the front end of the fixed platform support structure and generally toward the rear end of the fixed platform support structure.

11. The method of claim 1 wherein the cantilever beam assembly includes a forward end and a beam support surface, and wherein the step of supporting the drilling module on the cantilever beam assembly is further defined as supporting movably the drilling module on the beam support surface for movement of the drilling module on the beam support surface in a direction generally toward the forward end of the cantilever beam assembly and for movement of the drilling module on the beam support surface in a direction generally toward the rearward end of the cantilever beam assembly.

12. An apparatus for transferring a drilling module having a lower substructure support surface from a jack-up rig to a fixed platform wherein the fixed platform comprises legs secured to an ocean floor and wherein the jack-up rig comprises telescoping legs movable in upwardly and downwardly directions and wherein a portion of the jack-up rig is moveable in generally upwardly and downwardly directions and a cantilever beam assembly having a rearward end and a beam support surface and means for moving the cantilever beam assembly from a storage position wherein the cantilever beam assembly is supported generally on the jack-up rig to extended positions wherein the rearward end portion of the cantilever beam assembly is extended distances generally from the jack-up rig, the apparatus comprising:

a fixed platform support structure connected to the fixed platform having a drilling module support surface, a front end, a rear end, a first side and a second side; and

means for supporting the drilling module on the beam support surface of the cantilever beam assembly, said means being extendable by the cantilever beam assembly to an extended position for disposing the drilling module from the cantilever beam assembly on to the drilling module support surface of the fixed platform support structure, said means also supporting the drilling module on the drilling module support surface of the fixed platform support structure when the drilling module is transferred to the drilling module support surface.

13. The apparatus of claim 12 wherein the fixed platform support structure further comprises:

a first beam having an upper end, a first end and a second end;

a second beam having an upper end, a first end and a second end, the upper ends of the first and second beams cooperating to form the drilling module support surface; and

means for connecting the first and second beams to the fixed platform with the first beam being spaced a distance from the second beam and the space between the first and second beams cooperating to form a beam opening whereby the cantilever beam assembly with the drilling module disposed thereon is extendable through the beam opening and lowerable to dispose the drilling module on the drilling module support surface.

14. The apparatus of claim 12 wherein the cantilever beam assembly includes a forward end, and wherein the means for supporting the drilling module on the cantilever beam assembly is further defined as movably supporting the drilling module on the cantilever beam assembly for movement of the drilling module on the cantilever beam assembly in one direction generally toward the forward end of the cantilever beam assembly and for movement of the drilling module on the cantilever beam assembly in one other direction generally toward the rearward end of the cantilever beam assembly, and movably supporting the drilling module on the drilling module support surface of the fixed platform support structure when the drilling module is disposed on the drilling module support surface for movement generally toward the front end of the fixed platform support structure and for movement generally toward the rear end of the fixed platform support structure.

15. The apparatus of claim 14 wherein the means for supporting the drilling module on the cantilever beam assembly comprises:

a drilling module substructure having a first end, a second end, a first side, a second side, an upper surface and a lower surface, the lower surface being disposable on the cantilever beam assembly and the drilling module being supported on the upper end of the drilling module substructure;

means connectable to the drilling module substructure and connectable to the cantilever beam assembly for moving the drilling module substructure and the drilling supported thereon generally toward the forward end and generally toward the rearward end of the cantilever beam assembly; and

means connectable to the drilling module substructure and connectable to the fixed platform support structure for moving the drilling module supported thereon generally toward the front end and generally toward the rear end of the fixed platform support structure.

16. The apparatus of claim 12 wherein the means for supporting the drilling module on the fixed platform support structure, comprises:

a drilling module substructure having a first end, a second end, a first side, a second side, an upper end and a lower end, the drilling module being supported on the upper end of the drilling module substructure and the lower end being disposable on the drilling module support surface of the fixed platform support structure.

17. The apparatus of claim 16 wherein the means for supporting the drilling module on the fixed platform support structure, comprises:

restraining bar means removably connectable to the fixed platform support structure after the drilling module substructure has been disposed on the fixed platform support structure, said restraining bar means being engageable with the drilling module substructure for substantially restraining lateral movement of the drilling module substructure on the fixed platform support structure in directions generally toward the first and the second sides of fixed platform support structure.

18. The apparatus of claim 17 wherein the means for supporting the drilling module on the fixed platform support structure, comprises:

clamp means removably connectable to the fixed platform support structure and removably connectable to the drilling module substructure for restraining tilting movement of the drilling module substructure on the fixed platform support structure and for restraining movement of the fixed platform support structure in forward and rearward directions.

19. The apparatus of claim 12 wherein the fixed platform support structure is defined further as comprising a beam opening intersecting the front end and extending a distance generally toward the rear end of the fixed platform support structure, the beam opening being sized and adapted to receive the portion of the cantilever beam assembly with the drilling module disposed thereon, the cantilever beam assembly with the drilling module disposed thereon being moveable through at least a portion of the beam opening in the fixed platform support structure and positionable for cooperating to dispose the drilling module on the drilling module support surface of the fixed platform support structure.

20. The apparatus of claim 19 wherein the means for supporting the drilling module on the fixed platform support structure, comprises:

restraining bar means removably connectable to the fixed platform support structure after the drilling module has been disposed on the fixed platform support structure, said restraining bar means being engageable with the drilling module for substantially restraining lateral movement of the drilling module on the fixed platform support structure in directions generally toward the first and the second sides of fixed platform support structure.

21. The apparatus of claim 20 wherein the means for supporting the drilling module on the fixed platform support structure, comprises:

clamp means removably connectable to the fixed platform support structure and removably connectable to the drilling module for restraining tilting movement of the drilling module on the fixed platform support structure and for restraining movement of the fixed platform in forward and rearward directions.

22. The apparatus of claim 12 wherein the drilling module includes lower beam support surface and wherein the lower beam support surface is disposed on the beam support surface of the cantilever beam assembly when the drilling module is disposed on the cantilever beam assembly, and wherein the apparatus further comprises:

a floor; and

means for removably supporting the floor on the cantilever beam assembly in a position wherein at least a portion of the floor is disposed generally under the drilling module when the drilling module is supported on the cantilever beam assembly and wherein the floor is disposed in a horizontal plane spaced a distance from the horizontal plane in which the lower beam support surface of the drilling module is disposed.

23. The apparatus of claim 22 wherein the floor has a first side and a second side and wherein the cantilever beam assembly comprises a first cantilever beam and a second cantilever beam spaced a distance from the first cantilever beam, and wherein the floor is disposed generally between the first and second cantilever beams, and wherein the means for removably supporting the floor on the cantilever beam assembly comprises:

a plurality of floor supports with some of the floor supports being connected to the first side of the floor and the remaining floor supports being connected to the second side of the floor, each floor support extending a distance from the floor and being removably connectable to one of the first and the second cantilever beams.

24. The apparatus of claim 23 further comprising:

means for removably connecting the floor supports to the first and second cantilever beams.

25. The apparatus of claim 12 wherein the cantilever beam assembly comprises a first cantilever beam having an upper surface and a second cantilever beam having an upper surface with the first cantilever beam being spaced a distance from the second cantilever beam, the upper surfaces of the first and second cantilever beams forming a beam support surface, and the means for supporting the drilling module on the cantilever beam assembly and on the drilling module support surface of the fixed platform support structure further comprises:

a drilling module substructure having a first end, a second end, a first side, a second side, an upper surface, and a lower surface;

four guide shoe structures with each guide shoe structure being connected to the lower surface of the drilling module substructure and each guide shoe structure extending the distance generally from the lower surface of the drilling module substructure terminating with an outer end, one of the guide shoe structures being disposed generally near the first side and generally near the first end of the drilling module substructure, one of the guide shoe structures being disposed generally near the first end and generally near the second side of the drilling module substructure, one of the guide shoe structures being disposed generally near the second end and generally near the first side of the drilling module substructure and one of the guide shoe structures being disposed generally near the second end and generally near the second side of the drilling module substructure; and

four guides shoes, each guide shoe being connected to the outer end of one of the guide shoe structures, the guide shoes cooperating to form the lower substructure support surface, the lower substructure support surface being disposed on the drilling module support surface when the drilling module is disposed on the fixed platform support structure.

26. The apparatus of claim 25 wherein the means for supporting the drilling module on the cantilever beam assembly further comprises:

beam support frame means connected to the lower surface of the drilling module substructure and extending a distance therefrom terminating with a lower end; and

a plurality of guide shoes connected to the lower end of the beam support frame means, each guide shoe having a recess formed in a portion thereof and means disposed in each recess for forming the drilling module support surface.

27. The apparatus of claim 26 wherein the cantilever beam assembly further comprises:

a first cantilever beam having an upper end, a first end and a second end; and

a second cantilever beam having an upper end, a first end and a second end, the upper ends of the first and second cantilever beams cooperating to form the beam support surface; and

wherein some of the guide shoes forming the lower beam support surface are supported on the upper end of the first cantilever beam and wherein the remaining guide shoes are supported on the upper end of the second cantilever beam when the drilling module substructure with the drilling module supported thereon is disposed on the cantilever beam assembly.

28. The apparatus of claim 27 further comprising:

means for restraining lateral movement of the drilling module substructure and the drilling module supported thereon on the first and the second cantilever beams when the drilling module substructure is supported on the first and second cantilever beams.

29. The apparatus of claim 26 wherein the lower beam support surface is disposed in a horizontal plane disposed generally below a horizontal plane in which the lower substructure support surface is disposed.

30. The apparatus of claim 25 wherein the outer end of the guide shoe structures defines a supporting surface, and wherein the outer ends of the guide shoe structures are supportable on the drilling module support surface to compensate for misalignment of the rig substructure on the fixed platform support structure and to support the rig substructure on the fixed platform support structure while the rig substructure is moved into alignment with the lower substructure support surface supported on the drilling module support surface.

31. The apparatus of claim 25 further comprising:

means for restraining lateral movement of the drilling module substructure and the drilling module supported thereon on the fixed platform support structure when the drilling module substructure is supported on the fixed platform support structure.