Method and apparatus for transferring a structure from a jack-up rig to a fixed platform

• US 5,419,657 A
• Filed: 11/18/1993
• Issued: 05/30/1995
• Est. Priority Date: 05/08/1992
• Status: Expired due to Term

• Current Assignee: Rowan Companies Incorporated
• Original Assignee: Rowan Companies Incorporated
• Inventors: Davis, James B.
• Primary Examiner(s): Taylor, Dennis L.
• Application Number:
  US08/155,094
• Time in Patent Office: 558 Days
• Field of Search: 405/201, 405/209, 405/196, 405/203, 52/726.1, 52/726.2, 403/13, 403/364, 403/340
• US Class Current: 405/209
• CPC Class Codes: E02B 17/021 with relative movement between supporting construction and platform
• CPC Class Codes: E02B 17/027 steel structures E02B17/021 takes precedence
• CPC Class Codes: E02B 2017/006 with lattice style supporting legs
• CPC Class Codes: E02B 2017/0082 Spudcans, skirts or extended feet
• CPC Class Codes: Y10T 403/1616 Position or guide means
• CPC Class Codes: Y10T 403/655 Mirror images
• CPC Class Codes: Y10T 403/7045 Interdigitated ends

Abstract

A method and apparatus for transferring a functional package from a jack-up rig to a fixed platform is provided. A functional package comprising a drilling package, a construction crane, a rocket launch module, or other heavy apparatus may be directly placed upon a fixed platform without exceeding the load bearing limits of a fixed platform. This placement occurs using a cantilever beam that is spliced so that it may be separated into a shuttle portion and a base portion to reduce the weight effect of the cantilever beam upon the fixed platform. The cantilever beam may be provided with a new and unique splice section that permits detachment of the distal shuttle portion upon which rests a functional package. The distal shuttle may be deposited onto a fixed platform. The distal shuttle may be reattached after operations are completed for transfer of the functional package to another location.

Claims

1. An apparatus for transferring a functional package from a jack-up rig to a fixed platform, comprising:

a cantilever beam adapted for separation into a distal shuttle portion and a proximal base portion, a functional package, said functional package being supportable by said distal shuttle portion, said cantilever beam being adapted for displacement of the functional package from an inboard position generally inside the outer edge of the jack-up rig to an outboard position over an edge of the jack-up rig and over a portion of a fixed platform, wherein the cantilever beam contains a splice for separation into said distal shuttle portion and said proximal base portion;

wherein the splice is comprised of fingers, the fingers having interlocking and opposing camming surfaces, the fingers projecting from both the distal shuttle portion and the proximal base portion of the cantilever beam;

said jack-up rig being adapted for supporting and positioning said cantilever beam;

the distal shuttle portion of said cantilever beam being separable from said proximal base portion and supportable by the fixed platform after separation.

2. An apparatus, as set forth in claim 1, wherein the functional package comprises a drilling package.

3. An apparatus, as set forth in claim 1, wherein the functional package comprises a construction crane.

4. An apparatus as set forth in claim 1, wherein the functional package comprises a rocket launch module.

5. An apparatus as set forth in claim 1, wherein the functional package comprises an engine to be tested.

6. An apparatus, as set forth in claim 2, wherein the cantilever beam contains a splice for separation into said distal shuttle portion and said proximal base portion.

7. An apparatus, as set forth in claim 6, wherein said splice is comprised of a plurality of fingers adapted to interlock.

8. An apparatus for transferring a functional package from a jack-up rig to a fixed platform, comprising:

a cantilever beam adapted for separation into a distal shuttle portion and a proximal base portion, a functional package, said functional package being supportable by said distal shuttle portion, said cantilever beam being adapted for displacement of the functional package from an inboard position generally inside the outer edge of the jack-up rig to an outboard position over an edge of the jack-up rig and over a portion of a fixed platform, wherein the cantilever beam contains a splice for separation into said distal shuttle portion and said proximal base portion;

wherein said splice is comprised of a plurality of fingers adapted to interlock, further wherein said slice is comprised of two beam sandwiches, each beam sandwich having a top plate pivotal array with top apertures, a bottom plate pivotal array with bottom apertures, and middle beam plates with middle apertures, wherein the top, bottom, and middle apertures are in registration to form a beam sandwich;

said jack-up rig being adapted for supporting and positioning said cantilever beam; and

the distal portion of said cantilever beam being separable from said proximal base portion and supportable by the fixed platform after separation.

9. An apparatus as set forth in claim 8, wherein at least one of said top, middle and bottom beam plates pivot about an axis.

10. A cantilever beam for transferring a functional package from a jack-up rig to a fixed platform, said cantilever beam having a splice comprised of interlocking and opposing camming surfaces, said splice adapted for separation of said cantilever beam into a distal shuttle portion adapted to support the functional package on the fixed platform and a proximal base portion adapted to remain on the jack-up rig.

11. An apparatus for increasing the range of a construction crane, comprising:

a cantilever beam adapted for separation into a distal shuttle portion and a proximal base portion by disengaging a plurality of fingers, the construction crane being supportable by said distal shuttle portion, said cantilever beam being adapted for displacement of the construction crane from an inboard position generally inside the outer edge of a jack-up rig to an outboard position over an edge of the jack-up rig, said jack-up rig being adapted for supporting and positioning said cantilever beam.

12. A method of transferring a functional package from a deck of a jack-up rig to a fixed platform by separating a cantilever beam into a distal shuttle portion and a proximal base portion, comprising the steps of:

(a) transporting a jack-up rig containing a functional package to a location of a fixed platform;

(b) positioning the jack-up rig adjacent the fixed platform;

(c) raising the deck of the jack-up rig to position the cantilever beam above the height of the deck of the fixed platform, said cantilever beam comprising a proximal end and a distal end;

(d) extending the distal end of the cantilever beam from the deck of the jack-up rig;

(e) lowering the jack-up rig so that the distal shuttle portion of the cantilever beam rests upon the fixed platform;

(f) separating the distal shuttle portion of the cantilever beam;

(g) lowering the jack-up rig such that the upper surface of the proximal base portion of the separated cantilever beam is at about the same vertical height as the deck of the fixed platform; and

(h) positioning an upper pipe rack upon the proximal base portion to facilitate the transfer of drilling pipe from the surface of the proximal base portion to the functional package.

13. The method of claim 12, wherein said functional package comprises a construction crane.

14. The method of claim 12, wherein said functional package comprises a drilling package.

15. The method of claim 12, wherein the functional package comprises a rocket launch module.

16. A method of transferring a functional package from a jack-up rig to a fixed platform by separating a cantilever beam into a distal shuttle portion and a proximal base portion, comprising the steps of:

(a) transporting a jack-up rig containing a functional package and a deck to a location of a fixed platform;

(b) positioning the jack-up rig adjacent the fixed platform;

(c) raising the deck of the jack-up rig to position the cantilever beam above the height of the deck of the fixed platform;

(d) extending the distal end of the cantilever beam from the deck of the jack-up rig;

(e) lowering the jack-up rig so that the distal shuttle portion of the cantilever beam rests upon the fixed platform;

(f) separating the distal shuttle portion of the cantilever beam by disengaging a plurality of fingers; and

(g) repositioning the jack-up rig to another location.

17. The method of claim 16, additionally comprising the steps of:

(a) returning the jack-up rig to the location of the fixed platform;

(b) repositioning the jack-up rig adjacent the fixed platform;

(c) raising the deck of the jack-up rig to position the proximal base portion adjacent to the distal shuttle portion;

(d) reconnecting the proximal base portion with the distal shuttle portion to form the cantilever beam;

(e) retracting the distal end of the cantilever beam from the deck of the fixed platform;

(f) lowering the deck of the jack-up rig.

18. A method of transferring a functional package from a jack-up rig to a fixed platform by separating a cantilever beam into a distal shuttle portion and a proximal base portion, comprising the steps of:

(a) transporting, a jack-up rig containing a functional package to a location of a fixed platform;

(b) positioning the jack-up rig adjacent the fixed platform;

(c) raising the deck of the jack-up rig to position the cantilever beam above the height of the deck of the fixed platform;

(d) extending the distal end of the cantilever beam from the deck of the jack-up rig;

(e) lowering the jack-up rig so that the distal shuttle portion of the cantilever beam rests upon the fixed platform;

(f) separating the distal shuttle portion of the cantilever beam by disengaging a plurality of fingers and pivotally releasing the structural beam sandwiches by unbolting and then rotating beam plate sections at pivot points;

(g) repositioning the jack-up rig to another location;

(h) returning the jack-up rig to the location of the fixed platform;

(i) repositioning the jack-up rig adjacent the fixed platform;

(j) raising the deck of the jack-up rig to position the proximal base portion adjacent to the distal shuttle portion;

(k) reconnecting the proximal base portion with the distal shuttle portion to form the cantilever beam;

(l) retracting the distal end of the cantilever beam from the deck of the fixed platform; and

(m) lowering the deck of the jack-up rig.

19. The method of claim 18, wherein said distal end of the cantilever beam contains a plurality of removable truss members, whereby extension and retraction of the distal end of the cantilever beam proceeds over one or more blow-out preventers and is accomplished by detaching and reattaching removable truss members, thereby preserving the structural integrity of the cantilever beam during passage of the functional package over one or more blow-out preventers.

20. The method of claim 19, further comprising the step of:

reconnecting the proximal base portion to the distal shuttle portion using hydraulic jacks.