Floating platform and method of assembly

 

(57) Abstract:

The invention relates to shipbuilding, in particular, to the design of a floating platform and the way it build. Floating platform contains half-submerged in the water vessel having at least two pontoons, floating columns extending upward from these pontoons, deck, supported on columns, and a raft containing housing part and at least two floating caisson located on the lateral edges of the raft or near them. Floating caissons installed slightly above the top surface of the hull than the vertical sediment pontoons semisubmersibles in his condition without ballast. The vessel pontoons rigidly attached to the upper surface of the hull of the raft. Way to build a floating platform is that is filled with ballast raft so that the upper surface of its hull sank to a depth of greater precipitation vessel without ballast. Have the vessel above the Cabinet part of the raft and between separate floating caissons from the side edges of the raft. Remove the ballast from the raft so that the pontoons of the ship rose above the water level. Then rigidly securing the vessel to the upper surface of the hull dps is aceveda storing oil in place in the open sea. 2 C. and 8 C.p. f-crystals, 4 Il.

The present invention relates to a floating platform and / ways to build such a platform.

In particular, the invention relates to a floating platform, formed from an existing vessel, half-submerged in the water, and attached to the upper surface of the raft, specially made for this purpose.

Half-court use for several years in the development of mineral resources in the open sea for drilling, production and work in the open sea.

From the United Kingdom patent N 2068439A famous floating platform, long-term fixed in the open sea and is intended for use as a floating production installation that contains the half-submerged vessel having two pontoons, floating columns extending upward from these pontoons, deck, supported on columns. In U.S. patent No. 4 167 148 disclosed a method of assembling a floating platform, which consists in liberation from the ballast semisubmersibles so that it floated on its pontoons.

When transporting the vessel is released from the ballast so that it could float on pontoons with columns above the water. This allows the ship ω thus, to the pontoons are submerged, and only the floating columns were above the water surface, thus enabling the vessel substantial buoyancy with a small area of the plane of the waterline.

This design creates a more stable platform for operations in the open sea, than could be achieved for ordinary ships ship type. However, in the case of severe weather conditions, even partly submerged vessel is subjected to displacements which are unacceptable to perform work in the open sea including drilling and production. This leads to "downtime" during which all the operating costs of the semisubmersibles accumulate, but useful work is being performed.

Economic development of offshore oil and gas fields in areas with severe weather conditions leading to the need for drilling, production and other activities in the open sea with a gradual penetration into the sea with more severe conditions by minimizing downtime.

From the author's certificate USSR N 1303486 known dual raft with ballast, with platform, used as a lifting device for the Assembly or repair of emergent drill the second floating structure. This raft platform have under half-submerged drilling rig and then from it to remove the ballast to raise this emergent installation above the water for the Assembly or repair. This combined device set using anchor chain, located directly on the half-submerged drilling rig. This design has the disadvantage that the work can only be performed in the absence of any sea state for a limited period of time. Therefore, the combination of half-submerged drilling rig and managed floating structure disclosed in the author's certificate of the USSR N 1303486, is unsuitable as a permanent floating production units are located in a geographical area with harsh weather conditions in the open sea.

The technical result of the present invention is the creation of a stable floating platform, capable of a long time to work under more severe weather conditions in the open sea, than currently used, partly submerged vessels, providing the ability to store oil in place in the open sea, additional buoyancy to accommodate the additional equipment the technical result is achieved by in a floating platform, long-term fixed in the open sea, and intended for use as a floating production installation that contains the half-submerged vessel having at least two pontoons, floating columns extending upward from these pontoons, deck, supported on columns, according to the invention, has a managed floating design, which is located under the semisubmerged ship, able to lift this ship and represents the raft containing housing part having a platform large platform priporoshennaja vessel, and at least two separate floating caisson, located on the lateral edges of the raft or near them, and floating caissons installed slightly above the top surface of the hull than the vertical sediment pontoons semisubmersibles in his condition without ballast and the vessel pontoons rigidly attached to the upper surface of the hull of the raft with the possibility of formation of a combination of semisubmersibles and managed floating structure of a permanent production installation for operation in open sea.

Preferably, the basic part of the raft had' compartments for storage of oil and texts or remove oil from the raft.

It is advisable that the two adjacent floating caisson raft passed up to the level above sea level and were adapted for the location of additional deck space, connected to the deck semisubmersibles.

Preferably, the caissons had mooring equipment to secure the platform in place. This mooring equipment may contain a number of mooring ropes, which can be unwound from pontoons or vertical strained leash, which can be unwound from the caissons.

It is possible to raft contained equipment dynamic positioning.

Preferably, one or both of the upper and lower surfaces of the raft were tilted up or down from the edge of the raft to its centre.

It is desirable that the peripheral edge of the raft were shaped to reduce drag wave and/or loads.

The above technical result is achieved by the fact that in the method of assembling a floating platform, which consists in liberation from the ballast semisubmersibles so that it floated on its pontoons, according to the invention, filled with ballast managed floating structure, containing a raft, so Ob, have the vessel above the Cabinet part of the raft and between separate floating caissons from the side edges of the raft, remove the ballast from the raft so that the pontoons of the ship rose above the water level, and then rigidly securing the vessel to the upper surface of the hull of the raft.

Below are described two variants of implementation of the present invention with reference to the accompanying drawings, in which:

Fig. 1 is a side view of the floating platform according to the invention;

Fig. 2 represents an end view of the platform shown in Fig. 1;

Fig. 3 is a side view of another floating platform, according to the invention;

Fig. 4 represents an end view of the platform shown in Fig. 3

As shown in figure 1, the floating platform contains the usual half-submerged drilling vessel, which is often referred to in the industry of Mobile Coastal Drilling rig (SFDR). This SFDR has two elongated pontoon 1, eight floating columns 2, extending upward from these pontoons 1, the deck 3, supported on the columns 2. The pontoons 1 are separated inside able to be filled with ballast on the choice of waterproof compartments. SFDR is in the corner columns 2 boxes for anchor chains, winches 4 ve on the value of the anchor groups.

Shown as an example SFDR actually is a half-submerged drilling vessel in the series SEDCO 700, approximately fifteen pieces which have been used worldwide for various operational purposes at the time of writing this proposal.

In accordance with the present invention SFDR attached to manufactured for special purposes raft 6. Raft 6 typically has a housing part 7 with a rectangular platform, the size of which is larger than the SFDR. Body part 7 in the corners has caissons 8, which is located slightly above the top surface of the hull 7 than vertical sediment pontoons 1 SFDR when they are released from the ballast condition.

In the simplest embodiment, the SFDR is fixed to the upper surface of the hull 7 between the four corner pockets 8. In this way, the raft 6 provides additional buoyancy installation SFDR, and also improves the stability characteristics SFDR. Mount the Jack up to the raft reduces applied to the SFDR wave loads, which largely sees itself raft. Thus greatly reduces fatigue, acting in the structural elements of the SFDR.

Raft 6 may have a Central bore shaft 9, through which may pass to the sea floor system 10 rigid or flexible vertical tubes, as shown in particular in figure 2. In this case, you want the floating platform remained in place over the support plate for drilling or production manifold 11.

The drawings show two alternative ways of retaining the platform is 13 deployed installing SFDR with winches 4 through the guide blocks 5 and then through an additional guide blocks 12, located on the upper parts of the caissons 8. These mooring ropes 13 come in the form of a series of eight or twelve anchor Svetov (not shown).

The second way of holding the platform in place it is held under the action of its own buoyancy way platform with supports tension. In this case, the tether 14 (shown in solid lines) go down from devices 15 tension, installed behind the caissons 8 to the support plates 16 for drilling Foundation tethered to the seabed.

The third way of holding the platform in place (not shown) platform supply equipment dynamic positioning so that are no unnecessary mooring ropes 13, no leash 14.

By changing the configuration of the raft body part 7 can be slightly convex (as shown by the dotted lines in figure 1 ), so that its residue in the center is less than sediment on its periphery. In the case of convex raft platform stands on the waves better, and so it will require less air gap between the nominal sea level and the lowest elements of the deck.

Regarding the design and build of the platform, it should be noted, Thu the social goals raft 6 is a simple design, and it can build sections on a regular shipyard and then build on protected water. Alternatively, the raft can be made of concrete method of manufacturing a basis for concrete offshore gravity based. Using the usual technique of shipbuilding or concrete placement, it is very economical to construct and assemble the raft (with internal compartments for the storage of petroleum).

The method of Assembly described above, the floating platform is as follows. The float 6 is filled with ballast, so that the upper surface of its hull 7 sank to a depth of more precipitation SFDR without ballast, have SFDR over the carcass part 7 of the float 6 and between separate floating caissons 8 from the side edges of the float 6. Then remove the ballast from the raft b so that the pontoons 1 SFDR raised above the water level, and then rigidly securing the Jack up to the upper surface of the hull 7 float 6.

In figures 3 and 4 shows a second variant implementation of the present invention, while the SFDR is shown on the raft 17. This requires additional manufacturing equipment for which the SFDR is no place on the deck. To meet this TMIB an element 19 and the fasteners 20 and support additional deck area 21, connected to the deck semisubmersibles 22. For additional deck space 21 can be mounted, additional operating elements 23 and the signal arrow 24.

Shown in figures 3 and 4 embodiment, the float 17 is designed in such a way as to provide buoyancy and support for additional deck space 21 near one caisson SFDR. If necessary, additional deck area can be formed also on the other end of the Jack up, as shown by dashed lines.

You can make many changes in the framework of the present invention. As mentioned above, the raft can also be made of concrete. This may be the preferred option for a semi-submersible platform, made of steel. Theoretically, with a raft of course, you can combine the semi-submersible platform made of concrete. The most profitable and the best solution would be to merge able to swim platform with steel columns and concrete raft.

Hereinafter referred to as pontoon platforms you can use a separate pontoons or buoyancy compartments or they can be combined circular or rectangular single housing or housing other suitable form. Case modit to accommodate the platform sites with columns. Thus, it can also be designed in the form of annular raft with a hole is round, oval or rectangular shape in the Central part. The location for columns a floating platform on a raft you can also prepare a special way for this purpose and adapted for mounting pillars of the platform.

1. Floating platform, long-term fixed in the open sea and is intended for use as a floating production installation that contains the half-submerged vessel having at least two pontoons, floating columns extending upward from these pontoons, deck, supported on columns, characterized in that it has managed floating structure located under the semisubmerged ship, able to lift this ship and represents the raft containing housing part having a platform, a large platform semisubmersibles, and at least two separate floating caisson located on the lateral edges of the raft or near them, and floating caissons installed slightly above the top surface of the hull than the vertical sediment pontoons semisubmersibles in his condition without ballast, and the pontoons the vessel is pogruzhennogo ship and managed floating structure of a permanent production installation for operation in open sea.

2. Floating platform under item 1, characterized in that the body part of the raft has compartments for storage of oil and it provides a means for flooding compartments opposite side to compensate for the accumulation or removal of oil from the raft.

3. Floating platform under item 1 or 2, characterized in that two adjacent floating caisson raft held up to the level above sea level and adjusted for the location of additional deck space, connected to the deck semisubmersibles.

4. Floating platform according to any one of paragraphs.1 to 3, characterized in that the caissons are mooring equipment to secure the platform in place.

5. Floating platform on p. 4, characterized in that the mooring equipment contains a number of mooring ropes, which can be unwound from the caissons.

6. Floating platform on p. 4, characterized in that the mooring equipment includes vertical strained leash, which can be unwound from the caissons.

7. Floating platform according to any one of paragraphs.1 - 6, characterized in that the raft contains equipment dynamic positioning.

8. Floating platform according to any one of paragraphs.1 to 7, characterized in that one or tea platform according to any one of paragraphs.1 - 8, characterized in that the peripheral edges tightly shaped to reduce drag wave and/or loads.

10. Way to build a floating platform, which consists in liberation from the ballast semisubmersibles so that it floated on its pontoons, characterized in that the fill ballast managed floating structure, containing a raft, so that the upper surface of its hull sank to a depth of greater precipitation vessel without ballast, have the vessel above the Cabinet part of the raft and between separate floating caissons from the side edges of the raft, remove the ballast from the raft so that the pontoons of the ship rose above the water level, and then rigidly securing the vessel to the upper surface of the hull of the raft.

 

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