Extension assemblies and methods thereof

• US 20080237175A1
• Filed: 03/26/2008
• Published: 10/02/2008
• Est. Priority Date: 03/30/2007
• Status: Abandoned Application

• Current Assignee: Remedial Cayman Limited (Remedial (Cyprus) PCL)
• Original Assignee: Remedial Cyprus Public Company Limited
• Inventors: Nimmo, Peter W., Altman, Richard A., Brown, Michael D.
• Application Number:
  US12/079,278
• Publication Number:
  US 20080237175A1
• Time in Patent Office: Days
• US Class Current: 212/348
• CPC Class Codes: B63B 35/4413 Floating drilling platforms, e.g. carrying water-oil separating devices
• CPC Class Codes: B66C 23/52 Floating cranes floating dredgers E02F
• 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
• CPC Class Codes: E02B 2017/0082 Spudcans, skirts or extended feet

Abstract

An extension assembly is provided that comprises spaced apart first and second extension beams, which are removeablely and independently affixed to a deck of a vessel. At least a portion the first and second extension beams extend beyond the transom of the vessel. The assembly further includes a modular traverse beam removeablely affixed to the first and second extension beams along a substantially perpendicular direction. The modular traverse beam is adapted to receive a work-over rig.

Claims

1. ) An extension assembly comprising:

a) a first extension beam removeablely affixed to a deck of a vessel, along a first direction with respect to the vessel;

b) a second extension beam removeablely affixed to the deck of the vessel, along a substantially parallel direction with respect to the first extension beam, and spaced a first distance from the first extension beam, wherein the first and second extension beams are affixed to the deck of the vessel independent of each other, and at least a portion the first and second extension beams extend beyond the transom of the vessel; and

c) a modular traverse beam removeablely affixed to the first and second extension beams along a substantially perpendicular direction with respect to the first direction, wherein the modular traverse beam is adapted to receive a work-over rig.

2. ) The extension assembly of claim 1 further comprising:

at least one modular tank affixed to the first and second extension beams along a substantially parallel direction with respect to the modular traverse beam.

3. ) The extension assembly of claim 1, wherein the first extension beam is removeablely affixed to a first track on the vessel'"'"'s deck, the second extension beam is removeablely affixed to a second track on the vessel'"'"'s deck, the first is pinned to a first moment plate affixed to the vessel and the second extension beam is pinned to a second moment plate affixed to the vessel.

4. ) The extension assembly of claim 3, wherein the vessel is an Elevating Support Vessel comprising:

a. a hull having a hull periphery, wherein the hull periphery has a bow, a center section, a transom, a bow sloped section between the bow and the center section, and a transom sloped section between the transom and the center section, and the transom is wider, along the vertical axis, than the bow, and the bow and transom are at least half as deep as the center section;

b. at least two rear jack-up legs movably attached to the hull;

c. at least one front jack-up leg movably attached to the hull;

d. a powered jacking mechanism connected to each of the jack-up legs for elevating and lowering each jack up leg relative to the hull between elevated and lowered positions;

e. at least two rear azimuthing thrusters affixed to a lower side of the transom; and

f. at least one front azimuthing thruster affixed to a lower side of the bow; and

g. a crane support further comprising,

i. at least two vertical members with each vertical member having a first and second end, the first end of the first vertical member is affixed to a first track, the first end of the second vertical member is affixed to a second track, the first and second tracks are affixed to a deck of an Elevating Support Vessel, the second end of the first vertical member is affixed to a first side of a platform, the second end of the second vertical member is affixed to a second side of the platform; and

h. a column having a proximate and distal end, the proximate end is affixed to the platform, and the crane is rotatably affixed to the distal end of the column, the platform has a lower side disposed at least about 2 meters above the deck, the crane support apparatus is movable along the track.

5. ) The extension assembly of claim 3, wherein the first and second tracks are T-shaped and a distal portion of the first and second tracks are wider than the remainder of the tracks.

6. ) The extension assembly of claim 5, wherein the wider distal portion of the tracks have vertical protrusions of a height sufficient to prevent movement of the extension beams along a first axis.

7. ) The extension assembly of claim 6, wherein the first and second tracks and the first and second moment plates are, independently, integral with the hull of the vessel.

8. ) The extension assembly of claim 1, wherein the modular traverse beam is removeablely engaged with the first and second extension beams, a jacking system is affixed to at least the first extension beams for moving the modular traverse beam along the first and second extension beams.

9. ) The extension assembly of claim 8, wherein the modular traverse beam comprises a rail system adapted to receive a work-over rig that may skid along the modular traverse beam in a direction substantially perpendicular to the first and second extension beams.

10. ) The extension assembly of claim 9, wherein the modular traverse beam further comprises a second rail system along a lower interior portion of the modular traverse beam.

11. ) The extension assembly of claim 10, wherein the modular traverse beam comprises an observation deck, and a sled affixed to the second rail system along the lower interior portion of the modular traverse beam.

12. ) The extension assembly of claim 8, wherein the modular traverse beam is adapted to receive an at least about 100 metric ton work-over rig.

13. ) The extension assembly of claim 1, comprising at least two modular tanks removeabely affixed to the first and second extension beams by a means selected from the group consisting of pins, hooks, straps, and the like.

14. ) The extension assembly of claim 13, wherein the modular tanks are adapted to store material selected from the group consisting of fluid tanks, alarm systems, fluid manifold systems, electrical systems, and hydraulic system.

15. ) A method of assembling an extension assembly comprising:

a) using a crane affixed to a deck of a vessel to remove a first extension beam from a transom of the vessel, and affix the first extension beam to the deck of the vessel, along a first direction with respect to the vessel, wherein at least a portion of the first extension beam extends beyond the transom of the vessel;

b) securing the first extension beam to a first moment plate affixed to the vessel;

c) using the crane to remove a second extension beam from the transom, and affix the second extension beam to the deck of the vessel, along a substantially parallel direction with respect to the first extension beam, and spaced a first distance from the first extension beam, wherein at least a portion of the second extension beam extends beyond the transom of the vessel;

d) securing the second extension beam to a second moment plate affixed to the vessel;

e) using the crane to move a modular traverse beam from the deck of the vessel, and affix the modular traverse beam to the first and second extension beams along a substantially perpendicular direction with respect to the first direction, wherein the modular traverse beam is adapted to receive a work-over rig; and

f) using the crane to move to work-over rig from the deck of the vessel, and affix the work-over rig to the modular traverse beam.

16. ) The method of claim 15 further comprising, using the crane to move a first modular tank from the deck of the vessel, and affix the first modular tank to the first and second extension beams along a substantially parallel direction with respect to the modular traverse beam.

17. ) The method of claim 15, wherein the first extension beam is affixed to a first track on the deck of the vessel, and the second extension beam is affixed to a second track on the deck of the vessel.

18. ) The method of claim 17, wherein the vessel is an Elevating Support Vessel comprising:

i. a hull having a hull periphery, wherein the hull periphery has a bow, a center section, a transom, a bow sloped section between the bow and the center section, and a transom sloped section between the transom and the center section, and the transom is wider, along the vertical axis, than the bow, and the bow and transom are at least half as deep as the center section;

j. at least two rear jack-up legs movably attached to the hull;

k. at least one front jack-up leg movably attached to the hull;

l. a powered jacking mechanism connected to each of the jack-up legs for elevating and lowering each jack up leg relative to the hull between elevated and lowered positions;

m. at least two rear azimuthing thrusters affixed to a lower side of the transom; and

n. at least one front azimuthing thruster affixed to a lower side of the bow; and

o. a crane support further comprising,

ii. at least two vertical members with each vertical member having a first and second end, the first end of the first vertical member is affixed to a first track, the first end of the second vertical member is affixed to a second track, the first and second tracks are affixed to a deck of an Elevating Support Vessel, the second end of the first vertical member is affixed to a first side of a platform, the second end of the second vertical member is affixed to a second side of the platform; and

iii. a column having a proximate and distal end, the proximate end is affixed to the platform, and the crane is rotatably affixed to the distal end of the column, the platform has a lower side disposed at least about 2 meters above the deck, the crane support apparatus is movable along the track.

19. ) The method of claim 18 further comprising, prior to using the crane, selecting a location to jack-up the Elevating Support Vessel comprising:

a. moving the Elevating Support Vessel within proximity of an offshore structure;

b. mapping at least a portion of the sea floor near the offshore structure;

c. using the mapped portion of the sea floor to determine a jack-up location;

d. moving the Elevating Support Vessel to the determined jack-up location; and

e. jacking-up the Elevating Support Vessel.

20. ) The method of claim 19 wherein the step of jacking-up the Elevating Support Vessel includes a method of holding station comprising:

a. using attitude measuring devices to determine an initial position of the Elevating Support Vessel, wherein the attitude measuring devices are in communication with a computer;

b. using attitude measuring devices to determine subsequent positions of the Elevating Support Vessel;

c. using the computer to measure the subsequent positions of the Elevating Support Vessel relative to the initial position;

d. using the computer to determine an amount of force and a vector direction that must be exerted on the Elevating Support Vessel to move the Elevating Support Vessel back to the initial position;

e. transmitting an electrical signal to the at least three azimuthing thrusters to move the Elevating Support Vessel in the determined force and vector direction, wherein the Elevating Support Vessel remains within at least a 3 meter radius from the initial position.