Method and apparatus for elevating a marine platform

Abstract

A method of elevating the deck area of a marine platform (e.g., oil and gas well drilling or production platform) utilizes a specially configured sleeve support to support the platform legs so that they can be cut. Once cut, rams or jacks elevate the platform above the cuts. The sleeve support is then connected (e.g., welded) to the platform leg and becomes part of the structural support for the platform. In one embodiment, two sleeves are employed. In another embodiment, the jacks or rams elevate in two stages including a first stage wherein one sleeve elevates and the other sleeve does not elevate and a second stage wherein both sleeves elevate together.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable

REFERENCE TO A “MICROFICHE APPENDIX”

Not applicable

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to marine platforms such as oil and gas well drilling platforms. More particularly, the present invention relates to an improved method and apparatus for elevating the deck area of a fixed marine platform to better protect equipment that is located on the deck area from the effects of a storm (e.g., hurricane, tsunami, typhoon) that generates heightened wave action.

2. General Background of the Invention

There are many fixed platforms located in oil and gas well drilling areas of oceans and seas of the world. Such marine platforms typically employ an undersea support structure that is commonly referred to as a jacket. These jackets can be many hundreds of feet (meters) tall, being sized to extend between the seabed and the water surface area. Jackets are typically constructed of a truss-like network of typically cylindrically shaped pipe, conduit or tubing that is welded together. The jackets can be secured to the seabed using pilings that are driven into the seabed. The jacket is then secured to the piling. The part of the offshore marine platform that extends above the jacket and above the water surface is typically manufactured on shore and placed upon the jacket using known lifting equipment such as a derrick barge. This upper portion is the working part of the platform that is inhabited by workers.

Marine platforms can be used to perform any number of functions that are associated typically with the oil and gas well drilling and production industry. Such platforms can be used to drill for oil and gas. Such platforms can also be used to produce wells that have been drilled. These fixed platforms typically provide a deck area that can be crowded with extensive equipment that is used for the drilling and/or production of oil and gas.

When storms strike over a body of water, offshore marine platforms are put at risk. While the jacket and platform are typically designed to resist hurricane force wind and wave action, equipment located on the deck of the marine platform can easily be damaged if hurricane generated wave action reaches the deck area.

An additional consequence of wave action reaching the platform deck is catastrophic platform collapse, which happened in several instances during recent storms (e.g., hurricane Katrina in the United States Gulf of Mexico).

BRIEF SUMMARY OF THE INVENTION

The present invention solves these prior art problems and shortcomings by providing a method and apparatus for elevating the deck area of an existing marine platform so that equipment that occupies the deck can be further distanced from the water surface. The method of the present invention provides more clearance, more freeboard and more protection to deck area equipment during severe storms such as hurricanes.

The present invention includes a method of elevating a marine platform that is supported by a plurality of hollow metallic leg sections that extend above and below a water line of a body of water, comprising the steps of: (a) cutting one of the leg sections at a position next to the water line to provide a cut at a selected elevation, (b) attaching a plurality of hydraulic rams to the leg sections with a first padeye having a first height, each ram having a hollowed cylinder and an extensible push rod and first and second end portions, the rams being attached to the leg section at the end portions, one end portion being attached to the leg section above the cut and the other end portion being attached to the leg section below the cut, and wherein each ram has a retracted and an extended position, (c) surrounding each ram with telescoping sleeves, one sleeve sliding within the other sleeve, (d) repeating steps “a” through “b” for the other leg sections of the platform, (e) elevating the platform a first distance by extending each ram to the extended position, wherein one sleeve travels away from the other sleeve, (f) removing the first padeye for each ram, (g) attaching a second padeye having a second height that is greater than the first height, and (h) elevating the platform an additional, second distance.

Preferably, the present invention further comprises placing the rams on the outside of the leg section and circumferentially spacing the rams around the leg section.

Preferably, in step “b” at least one sleeve is comprised of a plurality of connectable half cylinder sections and attaching the sleeve in step “b” includes affixing the connectable half cylinder sections to the leg to form the sleeve.

Preferably, the present invention further comprises affixing lugs above the cut and attaching the rams to the lugs.

Preferably, the sleeves laterally stabilize the leg sections during step “e”.

Preferably, in step “c” there are at least three rams attached to each leg section.

Preferably, in step “c” there are between two (2) and eight (8) rams attached to each leg section.

Preferably, each leg section is elevated above the cut a distance of more than four feet (1.2 m).

Preferably, each leg section is elevated above the cut a distance of more than five feet (1.5 m).

Preferably, each leg section is elevated above the cut a distance of between about 5 and 30 feet (1.5 and 9.1 m).

Preferably, each leg section is carrying a load of between 100 and 2,000 tons (90.7 and 1,814 metric tons).

Preferably, the present invention further comprises the step of welding the sleeves to the leg sections after step “e”.

Preferably, the present invention further comprises the step of temporarily supporting the leg section above the cut with a pin that extends through aligned openings of the sleeve and the leg section.

Preferably, the present invention further comprises reinforcing the leg section next to the pin with a section of curved plate welded to the leg section on its outer surface.

The present invention includes a method of elevating a marine platform that is supported by a plurality of hollow metallic leg sections that extend above and below a water line of a body of water, comprising the steps of: (a) cutting one of the leg sections at a position next to the water line to provide a cut at a selected elevation, (b) attaching a plurality of hydraulic rams to the leg sections, each ram having a hollowed cylinder and an extensible push rod and first and second end portions, the rams being attached to the leg section at the end portions with first padeyes of a first height, one end portion being attached to the leg section above the cut and the other end portion being attached to the leg section below the cut, and wherein each ram has a retracted and an extended position, (c) surrounding each ram with telescoping sleeves, one sleeve sliding within the other sleeve, (d) repeating steps “a” through “b” for the other leg sections of the platform, (e) elevating the platform an initial distance by extending each ram to the extended position, (f) removing the first padeye for each ram in sequence and replacing the first padeye with a second padeye having a second height that is greater than the first height, and (h) elevating the platform deck an additional distance.

The present invention includes a method of elevating a marine platform that is supported by a plurality of hollow metallic leg sections that extend above and below a water line of a body of water, comprising the steps of: (a) cutting one of the leg sections at a position next to the water line to provide a cut at a selected elevation, (b) attaching a plurality of rams to the leg sections, each ram having a hollowed cylinder and an extensible push rod and first and second end portions, the rams being attached to the leg section at the end portions, one end portion being attached to the leg section above the cut and the other end portion being attached to the leg section below the cut at a first padeye having a first height, and wherein each ram has a retracted and an extended position, (c) repeating steps “a” through “b” for the other leg sections of the platform, (d) elevating the platform a first distance by extending each ram to the extended position, (e) replacing each first padeye with a second padeye having a height greater than said first height, and (f) extending the ram to elevate the platform a second distance.

Preferably, the present invention further comprises two sleeves that surround each ram, wherein one sleeve elevates above the other sleeve in step “d”.

Preferably, the present invention further comprises the step of welding one of the sleeves to the leg.

Preferably, the sleeves includes an outer lower sleeve and an inner upper sleeve.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:

FIG. 1 is a schematic, elevation view of a fixed marine platform;

FIG. 2 is a perspective view illustrating a method step of the present invention;

FIG. 3 is a perspective view illustrating a method step of the present invention;

FIG. 4 is a perspective view illustrating a method step of the present invention, placement of the upper and lower bushing sleeves;

FIG. 5 is a partial perspective view of a preferred embodiment of the apparatus of the present invention illustrating placement of the upper and lower bushing sleeves;

FIG. 6 is a partial perspective view of a preferred embodiment of the apparatus of the present invention illustrating a method step of the present invention;

FIG. 7 is a partial perspective view of a preferred embodiment of the apparatus of the present invention illustrating one of the extension sleeve guides;

FIG. 8 is a sectional view taken along lines 8-8 of FIG. 7;

FIG. 9 is a partial elevation view of a preferred embodiment of the apparatus of the present invention illustrating placement of the extension sleeve guides;

FIG. 10 is a partial elevation view of a preferred embodiment of the apparatus of the present invention showing positions of the leg cuts;

FIG. 11 is a partial perspective exploded view of a preferred embodiment of the apparatus of the present invention;

FIG. 12 is a partial perspective view of a preferred embodiment of the apparatus of the present invention illustrating the method of the present invention, placement of the upper ring;

FIG. 13 is a partial elevation view of a preferred embodiment of the apparatus of the present invention illustrating placement of the upper ring;

FIG. 14 is a partial perspective exploded view of a preferred embodiment of the apparatus of the present invention illustrating placement of the hydraulic pistons;

FIG. 15 is a partial perspective view of a preferred embodiment of the apparatus of the present invention illustrating placement of the hydraulic pistons;

FIG. 16 is a fragmentary elevation view illustrating the method of the present invention, namely the step of completing the leg cuts;

FIG. 17 is a fragmentary perspective of a preferred embodiment of the apparatus of the present invention illustrating extension of the leg with the hydraulics pistons;

FIG. 18 is a partial perspective view of a method and apparatus of the present invention, showing a method step of closing the sleeve openings;

FIG. 19 is an elevation view of a preferred embodiment of the apparatus of the present invention illustrating the marine platform after its deck area has been elevated using the method and apparatus of the present invention;

FIG. 20 is a partial elevation view of an alternate embodiment and method of the present invention illustrating an existing deck elevation prior to being elevated using an alternate embodiment of the apparatus of the present invention;

FIG. 21 is an elevation view illustrating an alternate method and apparatus of the present invention and showing an initial deck lift;

FIG. 22 is a partial perspective view of an alternate method and apparatus of the present invention;

FIG. 23 is a partial perspective view of an alternate embodiment of the apparatus of the present invention;

FIG. 24 is a fragmentary elevation view of an alternate embodiment of the apparatus of the present invention and alternate method;

FIG. 25 is a fragmentary perspective view of an alternate embodiment of the apparatus and method of the present invention;

FIG. 26 is a fragmentary perspective view of an alternate embodiment of the apparatus and method of the present invention;

FIG. 27 is a fragmentary perspective view of an alternate embodiment of the apparatus and method of the present invention showing the locking pin; and

FIG. 28 is a partial perspective view of an alternate embodiment of the apparatus of the present invention illustrating a sleeve and a half-pipe pin trough that is used to support the pins prior to insertion;

FIG. 29 is a partial elevation view of an alternate embodiment of the apparatus of the present invention showing an alternate method of the present invention;

FIG. 30 is a partial elevation view of an alternate embodiment of the apparatus of the present invention showing an alternate method of the present invention;

FIG. 31 is a partial elevation view of an alternate embodiment of the apparatus of the present invention showing an alternate method of the present invention;

FIG. 32 is a partial elevation view of an alternate embodiment of the apparatus of the present invention showing an alternate method of the present invention;

FIG. 33 is a partial elevation view of an alternate embodiment of the apparatus of the present invention showing an alternate method of the present invention;

FIG. 34 is a perspective view of an alternate embodiment of the apparatus of the present invention and illustrating an alternate method of the present invention;

FIG. 35 is an exploded elevation view illustrating an alternate embodiment of the apparatus of the present invention and an alternate method of the present invention;

FIG. 36 is a fragmentary view of an alternate embodiment of the apparatus of the present invention;

FIG. 37 is a fragmentary view of an alternate embodiment of the apparatus of the present invention;

FIG. 38 is a partial sectional elevational view of an alternate embodiment of the apparatus of the present invention;

FIG. 39 is a partial sectional elevational view of an alternate embodiment of the apparatus of the present invention;

FIG. 40 is a partial sectional elevational view of an alternate embodiment of the apparatus of the present invention;

FIG. 41 is a perspective view of an alternate embodiment of the apparatus of the present invention;

FIG. 42 is an elevation view taken along lines 42-42 of FIG. 41;

FIG. 43 is a fragmentary top view of an alternate embodiment of the apparatus of the present invention, showing a first lower stage padeye;

FIG. 44 is a elevation view taken along lines 44-44 of FIG. 43;

FIG. 45 is an elevation view taken along lines 45-45 of FIG. 43;

FIG. 46 is a fragmentary view of an alternate embodiment of the apparatus of the present invention, showing a ram locking pin;

FIG. 47 is an end view taken along lines 47-47 of FIG. 46;

FIG. 48 is a partial perspective view of an alternate embodiment of the apparatus of the present invention, showing a stub pin;

FIG. 49 is a top view taken along lines 49-49 of FIG. 48;

FIG. 50 is an elevation view taken along lines 50-50 of FIG. 48;

FIG. 51 is an elevation of an alternate embodiment of the apparatus of the present invention;

FIG. 52 is another elevation view of an alternate embodiment of the apparatus of the present invention;

FIG. 53 is a partial plan view of an alternate embodiment of the apparatus of the present invention, showing a lower second stage padeye;

FIG. 54 is an elevation view taken along lines 54-54 of FIG. 53;

FIG. 55 is an elevation view taken along lines 55-55 of FIG. 53;

FIGS. 56 and 57 are fragmentary elevation views illustrating an alternate embodiment of the apparatus of the present invention and the method of the present invention;

FIG. 58 is a partial elevation view of an alternate embodiment of the apparatus of the present invention, showing a telescoping insert pipe;

FIG. 59 is a sectional view taken along lines 59-59 of FIG. 58;

FIG. 60 is a partial perspective exploded view of an alternate embodiment of the apparatus of the present invention;

FIG. 61 is a elevation view of an alternate embodiment of the apparatus of the present invention;

FIG. 62 is an elevation view of an alternate embodiment of the apparatus of the present invention;

FIG. 63 is a fragmentary elevation view of an alternate embodiment of the apparatus of the present invention, showing an upper sleeve;

FIG. 64 is an elevation view of an alternate embodiment of the apparatus of the present invention; and

FIG. 65 is an elevation view illustrating the platform leg after it has been elevated a selected dimension.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides a marine platform deck elevating system 10 that is shown generally in FIGS. 14-15 and 17 and in method steps that are illustrated in FIGS. 2-18.

In FIG. 1, a fixed marine platform 11 is shown having a deck 16 that is positioned at an elevation 18 that is elevated above the water surface 12 a distance H1 that is indicated by the numeral 19 in FIG. 1. The numeral 19 and the dimension line H1 represent the existing clearance above water. It is necessary to protect equipment that is contained on the deck 16 from storm generated wave action. Storms such as hurricanes can generate a storm surge and wave action that puts equipment and/or personnel located on deck 16 at peril. If a deck is not located at a safe elevation, it must be elevated. FIG. 1 illustrates a typical fixed platform 11 having a plurality of legs 14 that support the deck 16. Diagonal braces 17 can extend between legs 14 and deck 16 as shown in FIG. 1. The platform 11 can include other structures such as, for example, horizontal beams or members and/or additional vertical or diagonal members.

Legs 14 can be of a constant diameter or can include tapered sections 13, wherein the diameter of the upper leg section 15A is less than the diameter of the lower leg section 15B. Leg 14 can thus include a number of different leg sections such as a lower, larger diameter leg section 15B, a tapered leg section 13, and an upper, smaller diameter leg section 15A that is positioned above the tapered section 13. The method and apparatus of the present invention can be used to elevate the deck 16 to a new elevation 20 (see FIG. 19) that is higher than the previous, existing deck elevation 18 of FIG. 1. The method and apparatus of the present invention thus provides a new clearance 21 above water surface 12 (also shown by the arrow H2 in FIG. 19).

FIGS. 2 and 3 illustrate an initial method step of the present invention, namely the placement of lower bushing sleeve 24. The lower bushing sleeve 24 can be comprised of a pair of half sleeve sections 22, 23 as shown in FIGS. 2-3. The sections 22, 23 can be joined with welds 26 as shown in FIGS. 3-4. Arrows 25 in FIG. 2 schematically illustrate the placement of sleeve sections 22, 23 upon leg 14 at a position below tapered section 13 as shown.

In FIGS. 4-6, upper bushing sleeve 29 can also be comprised of a pair of sleeve half sections. The sleeve sections 27, 28 each provide an opening 35 or 36 that is receptive of a pin 50 as will be explained more fully hereinafter. Weld ring sections 30, 31 can be used to attach the sleeve sections 27, 28 to tapered section 13. As with the lower bushing sleeve 24, one or more welds 37 can be used to join the sleeve sections 27, 28 to each other. Arrows 33 in FIG. 4 illustrate the placement of sleeve sections 27, 28 upon tapered section 13. Arrows 34 in FIG. 4 illustrate the attachment of weld ring 32 to the assembly of sleeve sections 27, 28 and to tapered section 13.

In FIGS. 6-9 and 11, a plurality of extension sleeve guides 38 are shown. These extension sleeve guides 38 are attached to the platform 11 leg 14 at a position that is above upper bushing sleeve 29. The extension sleeve guides 38 can extend from tapered section 13 to smaller diameter leg section 15A as shown in FIGS. 6 and 9. Arrows 39 illustrate placement of extension sleeve guides 38 to leg 14. Each extension sleeve 38 can be comprised of flanges 40 and webs 41. The web 41 actually contacts the leg 14 and can be shaped to conform to the shapes of tapered section 13 and smaller diameter leg section 15A as shown in FIGS. 7 and 9 (see DIM “A”, FIG. 7).

In FIGS. 10-15, an extension sleeve 44 can be comprised of a pair of extension sleeve sections 45, 46. Each extension sleeve section 45, 46 has slots 47, 48 that can be used to complete a cut through the leg 14 after the sleeve sections 45, 46 have been attached to leg 14 and guides 38.

Before attachment of the sleeve sections 45, 46, four cuts are made through leg 14 as shown in FIG. 10. The cuts 42, 43 do not extend 360 degrees around the leg 14, but rather extend only a partial distance as shown in FIG. 10. Though partial cuts 42, 43 are made, enough of the leg 14 remains to structurally support the platform 11 and its deck 16 considering the use of sleeve 44 and the method of the present invention disclosed herein.

After the sleeve sections 45, 46 have been installed, a cut can be made to encircle the leg 14 thus severing it in two parts. In order to complete the cut, slots are provided in the sleeve sections 45, 46. In FIG. 11, the sleeve section 45 has slot 47. In FIG. 11, the sleeve section 46 has slot 48.

After installing the upper bushing sleeve 29, circular cut openings 49 are made through the leg 14 at the openings 35, 36 in the sleeve sections 27, 28. These cut openings 49 enable pin 50 to be placed through the openings 67, 68 in sleeve sections 45, 46 respectively as well as through the openings 49 in upper bushing sleeve 29. Pin 50 prevents uplift from damaging the platform 11 should a storm produce excess wave action before the method of the present invention can be completed.

Each of the sleeve sections 45, 46 provides lugs to which hydraulic pistons can be attached. Sleeve section 45 provides a plurality of lugs 51. Sleeve section 46 provides a plurality of lugs 52. Each of the lugs provides an opening for enabling a pinned connection to be made between the lugs 51, 52 and the hydraulic pistons 64. Lugs 51 provide openings 53. Lugs 52 provide openings 54. In a preferred method and apparatus, four pairs of lugs 51, 52 are thus provided to the extension sleeve 44. Each pair of lugs 51, 52 can be spaced circumferentially about sleeve 44, about 90 degrees apart.

A ring 55 is positioned above extension sleeve 44 as shown in FIGS. 12-15 and 17-19. Ring 55 is used to form a connection between the leg 14 and the hydraulic piston 64. Ring 55 can be formed of a pair of ring sections 56, 57 that are attached to the smaller diameter leg section 15A as shown in FIGS. 12 and 13. Each of the ring sections 56, 57 provides a plurality of lugs 58, 59. The ring section 56 has lugs 58. The ring section 57 has lugs 59. Each lug 58, 59 has a lug opening 60 that enables a pinned connection to be made between a lug 58 or 59 and a piston 64. Each ring section 56, 57 can be formed of arcuate generally horizontal plate sections and vertical plate sections. Each of the ring sections 56, 57 thus provide an upper arcuate plate section 61 and a lower arcuate plate section 62. Vertical plate sections 63 span between the upper and lower arcuate plate sections 61, 62.

Hydraulic pistons 64 are provided for elevating that portion of the leg 14 that is above the cuts that are made through the leg 14 (see FIGS. 10 and 16). Preferably three (3) or four (4) pistons can be used, but as few as two (2) rams can be used or more, such as many as eight (8) could be used, for example.

Each hydraulic piston 64 can be comprised of a cylinder 65 and an extensible push rod 66. Each end portion of hydraulic piston 64 provides an opening 69 on cylinder 65 that enables a pinned connection to be formed between each end of hydraulic piston 64 and lugs 51, 52 or 58, 59. The upper end portion of each hydraulic piston 64 attaches with a pinned connection to a lug 58 or 59 that is a part of ring 55. The lower end portion of each hydraulic piston 64 forms a pinned connection with the lugs 51, 52 of extension sleeve 44 as shown in FIGS. 14-15. Arrows 74 in FIG. 14 illustrate assembly of pistons 64 to lugs 51, 52, 58, 59.

Once the hydraulic pistons 64 have been installed to the position shown in FIG.15, a cut can be completed for severing leg 14. This can be seen in more detail in FIGS. 10, 15-16 wherein the previously formed cuts 42, 43 are shown. Notice that uncut portions 70 (DIM “B”, FIG. 16) of leg 14 align with the slots 47 or 48 of sleeve sections 45, 46. The leg 14 can thus be cut 360 degrees by cutting the previously uncut section 70 at slot 47 or 48, indicated by phantom lines as cut 73 in FIG. 16. The three hundred sixty degree cut (42, 43, 73) is made after the extension sleeve 44, hydraulic pistons 64 and ring 55 form a structural support of the leg 14 above and below the cuts 42, 43. In order to then elevate the smaller diameter leg section 15A relative to the larger diameter leg section 15B below tapered section 13, each hydraulic piston 64 can be activated as illustrated by arrows 72 in FIG. 17.

Once elevated, the various openings and slots in sleeve 44 can be covered for corrosion protection using a plurality of curved cover plate sections 71. To complete the repair, the sleeves 44 can be welded to the leg 14 and using shims as necessary between sleeve 44 and leg 14, tapered section 13 or sections 15A, 15B. While the method disclosed herein contemplates that the elevation process would preferably take place as one jacking operation, the invention should not be so restricted. The method of the present invention contemplates a method wherein the jacking process could be subdivided into several smaller (or shorter) jacking elevations. The legs 14 would be pinned off at an intermediate point and the jacks moved to a second set of lugs. Arrow 75 in FIG. 17 shows the distance that the upper leg section 15A is elevated.

FIGS. 20-40 show an alternate embodiment of the apparatus of the present invention designated generally by the numeral 80 in FIGS. 30-34. Marine platform deck elevating system 80 can be used to elevate the same deck 16 that was shown and described with respect to FIGS. 1-19. Therefore, the FIGS. 20-40 are schematic in that they do not show each and every part of the marine deck 16 to be elevated. FIGS. 5, 24, 29, 30 illustrate an existing deck elevation 18. The numeral 85 illustrates a spacing or clearance (for example, 20 feet (6.1 m)) between deck or upper deck 16 and a lower deck or lower deck portion 84.

A plurality of legs 83 span between the lower deck portion 84 and the deck or upper deck 16. Each of the legs 83 will be elevated using the method and apparatus of the present invention. An alternate method and apparatus 80 shown in FIGS. 20-40 can employ a two stage deck elevation. In FIG. 30, the existing deck elevation 18 is shown. In FIG. 31, an initial or first new deck elevation 81 is shown having a second clearance or elevation 86 (for example, 28 feet (8.5 m)). This second clearance 86 is thus an increase of 8 feet (2.4 m) (for example) over the initial clearance 85 of FIG. 20. In FIG. 31, the deck or upper deck 16 is now spaced 28 feet (8.5 m), as an example, above the lower deck portion 84.

In FIG. 31, a plurality of hydraulic rams or hydraulic jacks 102 have moved from the initial and collapsed position of FIG. 30 to a partially or first elevation. In FIG. 32, the hydraulic rams 102 employed are two stage rams having a first push rod 106 and a second push rod 107 which is inside and which telescopes with the first push rod 106. Such hydraulic rams 102 are commercially available, wherein the ram 102 has a first push rod 106 that telescopes inside of a lower ram cylinder 158 and a second push rod 107 that telescopes inside of the first push rod 106. In FIGS. 32, 33, 34 and 40, the deck 16 or upper deck has been elevated an additional 8 feet (2.4 m)to elevation or level at 82 so that the clearance or third clearance 87 in FIGS. 32-34 and 40 is now a spacing or clearance of 36 feet (11 m), as an example, between lower deck portion 84 and deck or upper deck 16. In FIG. 34, four legs 83 are shown, each having been extended a full clearance 87 (36 feet (11 m) per the example).

The method and apparatus of the present invention employs two sleeves 95, 101 in order to accomplish the elevation of deck or upper deck 16 relative to lower deck portion 84. FIGS. 20-21 illustrate that each leg 83 has a lower portion 88 and an upper portion 89. Partial cuts 90 are made in the leg 83 upper portion 89. These partial cuts through the deck legs can be, for example, about 45 degrees of the circumference of the leg 83. These partial cuts 90 can also be spaced circumferentially about leg 83 in equal amounts such as a spacing of about 45 degrees apart. Pin receptive openings 91 are formed in leg 83 upper portion 89 just below the partial cuts 90 and 180 degrees apart as shown in FIG. 21. After formation of the openings 91, an inner/upper sleeve 95 is affixed to upper leg 89 above the partial cuts 90 (see FIGS. 23-25). For example, the connection of sleeve 95 to upper portion 89 of leg 83 can be a welded connection. A lower support ring 92 is attached (for example, welded) to leg 83 lower portion 88 and spaced vertically below inner/upper sleeve 95 as shown in FIG. 24. Upper ring 97 is affixed (e.g., welded) to upper portion 89. The lower support ring 92 provides a plurality of padeyes 93, namely, one for each hydraulic ram 102 or a total of four padeyes 93 for the example shown in the drawings. Each padeye 93 provides a padeye opening 94 to which a pinned connection can be made between a ram 102 and a padeye 93. Each ram 102 can have openings or sleeves or bearings at its end portions for enabling a pinned connection to be perfected with a padeye 93 or 98.

The inner/upper sleeve 95 has sleeve openings 96. Sleeve opening 96 can be provided on sleeve 95 spaced 180 degrees apart as shown in FIG. 23. Similarly, there are two openings 91 in leg 83, the openings 91 being spaced about 180 degrees apart. In this fashion, when the rams 102 extend, the openings 96 will align with the openings 91 so that a locking pin 50 (FIGS. 27, 28) can be placed through the aligned openings 91, 96. An upper ring 97 can be a part of sleeve 95. The upper ring 97 is above the partial cuts 90 as shown in FIG. 24. A plurality of padeyes 98 are affixed to ring 97, each padeye 98 providing a padeye opening 99.

Multiple windows 100 are provided. The windows 100 (for example, four windows 100) are centered over each of the uncut portions of the leg 83 that are in between the partial cuts 90. In this fashion, once the sleeves 95 and rams 102 are attached as shown, the leg 83 upper 89 and lower 88 portions are structurally supported by the combination of sleeve 95 and rams 102. Cuts can be made through the windows 100 of the sleeve 95 to cut the remaining uncut portion of leg 83 so that the leg 83 is now cut 360 degrees and ready for elevation of upper part 89 relative to lower part 88.

In FIGS. 29-33 and 38-40, an outer/lower sleeve 101 is attached to leg 83 in between the bottom of sleeve 95 and the lower support ring 92. Pinned connections 103 join each hydraulic ram 102 to the padeyes 93 of lower support ring 92 at openings 94. A lower ram pin 108 is shown in FIG. 31 forming a pinned connection between hydraulic ram 102 and a pair of padeyes 93. Similarly, a pinned connection 104 is formed between second push rod 107 of hydraulic ram 102 and padeyes 98 at openings 99. In FIG. 31, an upper ram pin 109 is shown making a connection between push rod 107 and padeyes 98 at openings 99.

A pin trough 105 can be employed (e.g., welded to a sleeve 95, 101 as shown) for holding a generally cylindrically shaped locking pin 50 prior to use. The pins 50 can be placed in the trough (see FIG. 28) and retained in that position until they are ready to be deployed. Locking pins 50 can thus be inserted in case of storm conditions when a first stage of the lift is completed as shown in FIG. 21 wherein the pin 50 would extend through to spaced apart openings 110 at the top of the lower/outer sleeve 101 through both openings 96 in the upper/inner sleeve 95 and through both openings 91 of the leg 83.

In a fully extended position of FIGS. 32-34 and 40, pin 50 is inserted through both openings 111 at the lower end of the outer sleeve 101 and the openings 91 of the leg 83. A pin 50 is also inserted through the upper opening 110 of the outer/lower sleeve 101 and through the openings 96 of the inner/upper sleeve 95 as shown in FIGS. 32-34 and 40. After installation, each sleeve 95, 101 is connected (e.g., welded) to leg 83. Inner sleeve 95 is welded to upper portion 89 of leg 83. Outer sleeve 101 is welded to lower portion 88 of leg 83. The sleeves 95, 101 are connected (e.g., welded) together once full elevation (FIGS. 22, 23) is reached. Strokes or vertical spacers 112 can be placed (e.g., welded) on each leg 83 (see FIGS. 35, 38-40) as shown by arrow 113. Collar 114 having openings 115 can be used to reinforce leg 83 at openings 91.

FIGS. 41-65 show another alternate embodiment of the apparatus of the present invention, designated generally by the numeral 116. FIGS. 41-65 show a marine deck elevation system 116 for elevating platform 117 having a deck 119. The deck 119 is typically elevated above a water surface 12 as with the prior embodiments. The deck 119 is elevated with a plurality of vertical or inclined leg sections 118. (See FIGS. 41, 42).

The platform 117 can include horizontal members 120 and diagonally extending members 121. In the drawings, a cut location 122 is shown wherein the selected vertically extending leg sections 118 will be cut to provide an upper leg section 123 and a lower leg section 124 (see FIGS. 42, 51, 52). Using the method and apparatus of the present invention, multiple legs 118 (e.g., four (4)) of the platform 117 are elevated at the same time. The method and apparatus of the present invention is described particularly for one leg 118, each other of the four or more legs 118 being elevated in the same manner.

In order to elevate the upper leg section 123 relative to the lower leg section 124, there is provided a plurality of hydraulic rams 125, 126, 127, 128 (see FIG. 41). The rams 125, 126, 127, 128 can be identically constructed. Each hydraulic ram 125-128 is initially connected to or interfaced with deck 119 at an upper connector or upper first stage padeye 129. Each hydraulic ram 125-128 also interfaces with or connects to lower leg section 124 with lower first stage padeye or lower connect 130 (see FIG. 42). Padeye 130 can be bolted to plate 136. The lower first stage padeye or lower connect 130 (FIGS. 43-45) has a height which is shorter than the height of a second stage padeye 147 (FIGS. 53-55) which is used during a second elevation of the upper leg section 123 of a selected leg 118. Each hydraulic cylinder or ram 125-128 is surrounded by an upper sleeve 152 and a lower sleeve 153. The sleeve 153 is a smaller diameter, lower sleeve. The sleeve 152 is an upper larger diameter sleeve that fits over and telescopes relative to sleeve 153. In FIG. 51, sleeve 152 has been elevated with respect to sleeve 153.

Annular flanges or ring plates 131, 132, 135, 136 are provided, one or more above cut location 122 and one or more below cut location 122 as shown. Each ring plate 131, 132, 135, 136 is connected (e.g., welded) to a sleeve 152 or 153 (see FIG. 42). Each sleeve 152, 153 is connected to a leg section using plates 133, 134, 137, 138. Upper plates 133, 134 extend from sleeve 152 to upper leg section 123 above cut 122. Similarly, lower plates 137, 138 extend from sleeve 153 to lower leg section 124 at a position below cut 122.

In the drawings (see FIG. 42), the numeral 139 designates a starting position. The numeral 140 (see FIG. 51) shows a first extended position. In the first extended position, there is provided a gap or space 141. As part of the method of the present invention, there are two lift or elevation distances 142, 148. FIG. 51 shows the initial lift distance 142. FIG. 62 shows the second overall lift distance 148, designated as gap 150.

FIGS. 41-42 show a first step of the method of the present invention. As part of the first step, four hydraulic ram canisters 125, 126, 127, 128 are installed, connected to each selected deck leg 118 as shown in FIGS. 41-42. The method of the present invention would typically employ four hydraulic rams 125, 126, 127, 128 for each leg 118 as shown in FIG. 41. The first step would also include the installation (for example welding) of sleeves 152, 153 and ring plates 131, 132, 135, 136.

The second step of the method employs hydraulic pressure to pressurize each of the hydraulic rams 125, 126, 127, 128. Before a lift from position 139 (FIGS. 41, 42) to position 140 (FIG. 51), each leg 118 is flame cut at cut location 122 which is below annular flanges or ring plates 131, 132 and above annular flanges or ring plates 135, 136 (see FIGS. 41, 42).

FIG. 51 shows the third step of the method. In the third step, the hydraulic rams 125, 126, 127, 128 are extended so that the deck 119 is elevated a selected distance 142. Once the deck 119 has been elevated a selected distance 142, stub pins 151 are installed and welded in place to affix the positions of sleeves 152 (see FIG. 51). In FIG. 42, the starting position is designated by the numeral 139. In figure 51, the extended or elevated position is designated by the numeral 140. In FIG. 51, a gap or space 141 is shown after the hydraulic rams 125, 126, 127, 128 have elevated the upper leg section 123 a selected distance 142 and the stub pins 151 (see FIGS. 48-50) have been welded to secure the upper sleeve 152 relative to the lower sleeve 153, the sleeves surrounding each hydraulic ram 125, 126, 127, 128.

FIGS. 61-64 show the fourth step of the method. In FIGS. 61-64, the hydraulic rams 125, 126, 127, 128 are each disconnected from the lower padeye 130 which are removed in order to install a second lower padeye or second stage padeye 147. The longer padeye 147 is then attached to the lower end of the ram 125-128. Each ram is then retracted, drawing the longer padeye 147 into the sleeve 153. The longer padeye 147 is then bolted to the bottom of the sleeve 153 (e.g., bolted to plate 136) in the same way that the shorter padeye 130 was. Comparing the second stage padeye 147 of FIGS. 53-54 with the first stage padeye 130 of FIGS. 43-45, it can be seen that the lower first stage padeye 130 is much shorter than the lower second stage padeye 147. In FIG. 52, each lower first stage padeye 130 is removed (e.g., unbolted from ring plate 135 or 136 and ram locking pin 149 removed. Padeye 130 is replaced with a lower second stage padeye 147. The weight of the deck 119 is supported by the sleeve assemblies 152, 153 which surround the rams and the welded stub pins 151, a safety feature. In FIG. 56, each ram 125-128 is retracted after removal of first stage padeye 130 as indicated by arrow 156. Second stage padeye 147 is then pinned with a pin to a ram 125-128 (FIG. 57). As part of the fourth step, leg inserts 143 are installed around each lower sleeve 153 (see FIGS. 51, 64). As part of the fourth stage, the hydraulic rams 125, 126, 127, 128 are pressurized for a second stage lift. All first stage stub pins 151 are cut free and removed as indicated by arrows 157 in FIG. 61. Telescoping insert pipe 146 can be attached to the bottom of each upper sleeve 152 at weld points144. The halves of telescoping insert pipe 146 can be welded together longitudinally at weld edges 145 (see FIGS. 60, 61). Figure 51 depicts upper sleeve 152 surrounding a ram 125, 126, 127, 128.

The fifth step of the method can be seen in FIG. 62 wherein the deck 119 is elevated a second distance, designated by the numeral 148 in FIG. 62. Additional stub pins 151 can be placed (welded) securing telescoping insert pipe 146 relative to lower sleeve 153. In FIG. 62, a gap 150 can be seen in between lower leg section 124 and upper leg section 123.

FIGS. 64-65 show the sixth step of the present invention wherein the leg insert 143 is installed for all four of the legs 118 of the platform 117 as shown. Insert 143 is welded at its upper end to upper leg section 123 and weld 154 and at its lower end to lower leg section 124 at weld 155 (see FIGS. 64-65). Welds 154, 155 can be seen in FIG. 65.

In the final step of FIG. 65, all hydraulic rams 125-128, padeyes, sleeves, ring plates and plates have been removed from combination of the leg sections 123, 124 and insert 143.

The following is a list of parts and materials suitable for use in the present invention.

PARTS LIST
Part Number Description
10          marine platform deck elevating system
11          platform
12          water surface
13          tapered section
14          leg
15A         smaller diameter leg section
15B         larger diameter leg section
16          deck/upper deck
17          diagonal brace
18          existing deck elevation
19          existing clearance above water
20          new deck elevation
21          new clearance above water
22          sleeve section
23          sleeve section
24          lower bushing sleeve
25          arrow
26          weld
27          sleeve section
28          sleeve section
29          upper bushing sleeve
30          weld ring section
31          weld ring section
32          weld ring
33          arrow
34          arrow
35          opening
36          opening
37          weld
38          extension sleeve guide
39          arrow
40          flange
41          web
42          cut
43          cut
44          extension sleeve
45          extension sleeve section
46          extension sleeve section
47          slot
48          slot
49          drilled/circular cut opening
50          support/locking pin
51          lug
52          lug
53          opening
54          opening
55          ring
56          ring section
57          ring section
58          lug
59          lug
60          lug opening
61          upper arcuate plate section
62          lower arcuate plate section
63          vertical plate section
64          hydraulic piston
65          cylinder
66          push rod
67          opening
68          opening
69          opening
70          uncut portion
71          cover plate
72          arrows
73          cut
74          arrow
75          arrow
80          marine platform deck elevating system
81          first new deck elevator
82          second new deck elevator
83          leg
84          lower deck portion
85          initial clearance
86          second clearance
87          third clearance
88          lower portion
89          upper portion
90          partial cut
91          pin receptive opening
92          lower support ring
93          padeye
94          padeye opening
95          inner/upper sleeve
96          sleeve opening
97          ring
98          padeye
99          padeye opening
100         window
101         outer/lower sleeve
102         hydraulic ram
103         pinned connection
104         pinned connection
105         pin trough
106         first push rod
107         second push rod
108         lower ram pin
109         upper ram pin
110         upper opening
111         lower opening
112         stroke/vertical spacer
113         arrow
114         collar
115         opening
116         marine deck elevation system
117         platform
118         vertical or inclined leg section
119         deck
120         horizontal member
121         diagonally extending member
122         cut location
123         upper leg section
124         lower leg section
125         hydraulic ram
126         hydraulic ram
127         hydraulic ram
128         hydraulic ram
129         upper connect/upper first stage padeye
130         lower connect/lower first stage padeye
131         annular flange/ring plate
132         annular flange/ring plate
133         upper plate
134         upper plate
135         annular flange/ring plate
136         annular flange/ring plate
137         lower plate
138         lower plate
139         starting position
140         extended position
141         gap/space
142         lift/elevation distance
143         leg insert/insert pipes
144         weld
145         weld
146         telescoping insert pipe
147         lower second stage padeye
148         lift/elevation distance
149         ram locking pin
150         gap
151         stub pin
152         upper sleeve
153         lower sleeve
154         weld
155         weld
156         arrow
157         arrow
158         lower ram cylinder

All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise.

The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.

Claims

1. A method of elevating a marine platform that is supported by a plurality of hollow metallic leg sections that extend above and below a water line of a body of water, comprising the steps of: a) cutting one of the leg sections at a position next to the water line to provide a cut at a selected elevation;b) attaching a plurality of hydraulic rams to the leg sections with a first padeye having a first height, each ram having a hollowed cylinder and an extensible push rod and first and second end portions, the rams being attached to the leg section at the end portions, one end portion being attached to the leg section above the cut and the other end portion being attached to the leg section below the cut, and wherein each ram has a retracted and an extended position;c) repeating steps “a” through “b” for the other leg sections of the platform;d) elevating the platform a first distance by extending each ram to the extended position;e) removing the first padeye for each ram;f) attaching a second padeye having a second height that is greater than the first height; andg) elevating the platform an additional, second distance.

2. The method of claim 1 further comprising placing the rams on the outside of the leg section and circumferentially spacing the rams around the leg section.

3. The method of claim 1 further comprising affixing lugs above the cut and attaching the rams to the lugs.

4. The method of claim 1, further comprising the step of surrounding each ram with telescoping sleeves, one sleeve sliding within the other sleeve.

5. The method of claim 4 wherein at least one sleeve is comprised of a plurality of connectable half cylinder sections and attaching the sleeve includes affixing the connectable half cylinder sections to the leg to form the sleeve.

6. The method of claim 4 wherein the sleeves laterally stabilize the leg sections during step “d”.

7. The method of claim 4 further comprising the step of welding the sleeves to the leg sections after step “d”.

8. The method of claim 4 further comprising the step of temporarily supporting the leg section above the cut with a pin that extends through aligned openings of the sleeve and the leg section.

9. The method of claim 8 further comprising reinforcing the leg section next to the pin with a section of curved plate welded to the leg section on its outer surface.

10. The method of claim 1 wherein in step “b” there are at least three rams attached to each leg section.

11. The method of claim 1 wherein in step “b” there are between two (2) and eight (8) rams attached to each leg section.

12. The method of claim 1 wherein each leg section is elevated above the cut a distance of more than four feet (1.2 m).

13. The method of claim 1 wherein each leg section is elevated above the cut a distance of more than five feet (1.5 m).

14. The method of claim 1 wherein each leg section is elevated above the cut a distance of between about 5 and 30 feet (1.5 and 9.1 m).

15. The method of claim 1 wherein each leg section is carrying a load of between 100 and 2,000 tons (90.7 and 1,814 metric tons).

16. A method of elevating a marine platform that is supported by a plurality of hollow metallic leg sections that extend above and below a water line of a body of water, comprising the steps of: a) cutting one of the leg sections at a position next to the water line to provide a cut at a selected elevation;b) attaching a plurality of hydraulic rams to the leg sections, each ram having a hollowed cylinder and an extensible push rod and first and second end portions, the rams being attached to the leg section at the end portions with first padeyes of a first height, one end portion being attached to the leg section above the cut and the other end portion being attached to the leg section below the cut, and wherein each ram has a retracted and an extended position;c) repeating steps “a” through “b” for the other leg sections of the platform;d) elevating the platform an initial distance by extending each ram to the extended position;e) removing the first padeye for each ram in sequence and replacing the first padeye with a second padeye having a second height that is greater than the first height; andf) elevating the platform deck an additional distance.

17. The method of claim 16, further comprising the step of surrounding each ram with telescoping sleeves, one sleeve sliding within the other sleeve.

18. A method of elevating a marine platform that is supported by a plurality of hollow metallic leg sections that extend above and below a water line of a body of water, comprising the steps of: a) cutting one of the leg sections at a position next to the water line to provide a cut at a selected elevation;b) attaching a plurality of rams to the leg sections, each ram having a hollowed cylinder and an extensible push rod and first and second end portions, the rams being attached to the leg section at the end portions, one end portion being attached to the leg section above the cut and the other end portion being attached to the leg section below the cut at a first padeye having a first height, and wherein each ram has a retracted and an extended position;c) repeating steps “a” through “b” for the other leg sections of the platform;d) elevating the platform to a first elevation by extending each ram to the extended position;e) attaching each ram to a padeye having a height greater than said first height; andg) extending the ram to elevate the platform to a second elevation that is higher than said first elevation.

19. The method of claim 18 further comprising two sleeves that surround each ram, wherein one sleeve elevates above the other sleeve in step “d”.

20. The method of claim 19 further comprising the step of welding one of the sleeves to the leg.

21. The method of claim 19 wherein the sleeves include an outer lower sleeve and an inner upper sleeve.