Offshore platform jacket

Abstract

The utility model discloses an offshore platform jacket relates to offshore platform technical field. This offshore platform jacket includes the jacket main part and buoyancy device, and the buoyancy device is located at the bottom layer of jacket main part, and the buoyancy device is equipped with cavity and the air hole and water hole who respectively communicate with cavity, and the air hole is used to pass through the air injection pipeline and communicates with the air compressor on the workboat, and the water hole is used to fill water in the cavity after the jacket main part is lowered and is completed. The utility model improves the jacket structure of offshore platform, and increases the float tank in the lower layer of jacket, can adopt the semi-submersible ship transportation, and after the semi-submersible ship submerges, the float tank is immersed in water, provides buoyancy, reduces the requirement to the lifting capacity of crane, effectively avoids the frictional collision of jacket.

Description

Technical Field

[0001] This utility model relates to the field of offshore platform technology, and in particular to an offshore platform jacket. Background Technology

[0002] Currently, large offshore platforms generally use pile-type jacket foundations. The weight of the jacket typically ranges from several thousand tons to tens of thousands of tons. Jacket installation and launching methods are divided into skid-slip launching and hoisting launching. Hoisting launching is limited by the lifting capacity and height of the floating crane. For some larger jackets, existing vessels cannot meet the construction requirements, so skid-slip launching is used. However, during the skid-slip process, friction between the jacket and the skid track may cause localized structural deformation and coating damage. After skid-slip, the jacket is in a horizontal position and needs to be righted, a complex process. Utility Model Content

[0003] The main purpose of this utility model is to provide a jacket for offshore platforms, which aims to reduce the requirements on the lifting capacity of ships, realize the lifting and launching of jackets, and solve the problems of local structural deformation and coating damage caused by friction between the jacket and the slideway during sliding launch, as well as the complexity of subsequent righting operations.

[0004] To achieve the above objectives, this utility model proposes a jacket for offshore platforms, comprising: The main body of the jacket; and A buoyancy device is located at the bottom of the main body of the jacket. The buoyancy device has a cavity and air holes and water holes that are respectively connected to the cavity. The air holes are used to connect to the air compressor on the work vessel through an air injection pipe, and the water holes are used to fill the cavity with water after the main body of the jacket is lowered.

[0005] Optionally, the buoyancy device is a hollow, sealed structure, and its shape is a cylinder, cuboid, cube, or irregular shape.

[0006] Optionally, the buoyancy device is provided with a plurality of reinforcing ribs, which are arranged vertically to connect the top and bottom surfaces of the buoyancy device.

[0007] Optionally, the reinforcing rib is provided with a plurality of spaced-apart connecting holes to connect the cavities on both sides of the reinforcing rib, reduce material usage, and disperse stress.

[0008] Optionally, the distance between two adjacent reinforcing ribs is 2-4m; and / or the thickness of the reinforcing ribs is 7-9mm.

[0009] Optionally, a water inlet valve is provided at the water hole.

[0010] Optionally, both the air vent and the water vent are located on the top surface of the buoyancy device.

[0011] Optionally, the buoyancy of the buoyancy device is 6000-8000t; and / or the weight of the buoyancy device is 1000-1200t.

[0012] Optionally, the sidewalls and bottomwalls of the buoyancy device are connected to the horizontal circular tubes of the guide frame body; or The sidewall of the buoyancy device is connected to the horizontal circular tube of the guide frame body; or The sidewalls and topwalls of the buoyancy device are connected to the horizontal circular tubes of the main body of the guide frame.

[0013] Optionally, the buoyancy device is welded to the guide frame as a single unit.

[0014] In the technical solution of this utility model, the offshore platform jacket includes a jacket body and a buoyancy device. The buoyancy device is located at the bottom of the jacket body and has a cavity and air holes and water holes respectively connected to the cavity. The air holes are used to connect to the air compressor on the work vessel through an air injection pipe, and the water holes are used to fill the cavity with water after the jacket body is lowered. It can be understood that by setting up a buoyancy device, this utility model can provide buoyancy during hoisting and launching, effectively reducing the requirements on the lifting capacity of the ship, realizing the hoisting and launching of the jacket, and solving the problems of local structural deformation and coating damage caused by friction between the jacket and the sliding track during sliding launching, as well as the complexity of subsequent righting operations. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a front view of one embodiment of the offshore platform jacket of this utility model; Figure 2 This is a side view of one embodiment of the offshore platform jacket of this utility model; Figure 3 This is a top view of one embodiment of the offshore platform jacket of this utility model; Figure 4 This is a cross-sectional view of the lowest layer of the jacket (buoyancy device covering the entire area) in one embodiment of the offshore platform jacket of this utility model; Figure 5 This is a cross-sectional view of the lowest layer of the jacket (buoyancy device covering a local area) in one embodiment of the offshore platform jacket of this utility model; Figure 6This is a structural schematic diagram of the first connection form between the main body of the jacket and the buoyancy device in an embodiment of the jacket of this utility model for offshore platforms; Figure 7 This is a structural schematic diagram of a second connection form between the jacket body and the buoyancy device in one embodiment of the offshore platform jacket of this utility model; Figure 8 This is a structural schematic diagram of a third connection form between the jacket body and the buoyancy device in one embodiment of the offshore platform jacket of this utility model; Figure 9 This is a construction schematic diagram of an embodiment of the offshore platform jacket of this utility model.

[0017] Explanation of icon numbers: 100, jacket; 200, semi-submersible vessel; 300, crane vessel; 10, jacket body; 20, buoyancy device; 20a, cavity; 20b, air hole; 20c, water hole; 21, reinforcing rib; 21a, connecting hole.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. If the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. The technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This utility model proposes a jacket for offshore platforms.

[0024] Reference Figures 1 to 9 In some embodiments of this utility model, the offshore platform jacket 100 includes a jacket body 10 and a buoyancy device 20. The buoyancy device 20 is located at the bottom layer of the jacket body 10. The buoyancy device 20 has a cavity 20a and a plurality of air holes 20b and a plurality of water holes 20c that are respectively connected to the cavity 20a. The air holes 20b are used to connect to the air compressor on the work vessel through an air injection pipe. The water holes 20c are used to fill the cavity 20a with water after the jacket body 10 is lowered.

[0025] In this embodiment, the jacket body 10 can be a traditional large offshore platform jacket 100, and there is no limitation here.

[0026] The buoyancy device 20 is a device capable of generating a certain buoyancy. It can be a hollow, sealed structure, and its shape can be cylindrical, cuboid, cube, or irregular; no limitation is made here. Figure 4 and Figure 5 As shown, the buoyancy device 20 can cover the entire area of ​​the lowest layer of the jacket body 10, or it can only cover a part of the area. The buoyancy device 20 can be welded to the jacket 100 as a whole, or it can be fixed in other ways, which is not limited here.

[0027] To facilitate the injection of seawater into the buoyancy device 20 and improve the stability of the offshore platform jacket 100, a water inlet valve can be installed at the water hole 20c, and both the air hole 20b and the water hole 20c are located on the top surface of the buoyancy device 20. This allows for easy connection of an air compressor and facilitates the injection of seawater, thus improving construction efficiency.

[0028] It is understood that by setting up the buoyancy device 20, this utility model can provide buoyancy during the lifting and launching process, effectively reducing the requirements on the lifting capacity of the crane vessel 300, realizing the lifting and launching of the jacket 100, and solving the problems of local structural deformation and coating damage caused by friction between the jacket 100 and the slideway during the sliding launch, as well as the complexity of subsequent righting operations.

[0029] To further improve the structural reliability of the buoyancy device 20 and make the offshore platform jacket 100 more stable, the following references are made: Figures 6 to 8 In one embodiment, the buoyancy device 20 may be provided with a plurality of reinforcing ribs 21, which are arranged vertically to connect the top surface and the bottom surface of the buoyancy device 20.

[0030] In this embodiment, the reinforcing rib 21 may be provided with a plurality of evenly spaced connecting holes 21a to connect the cavities 20a on both sides of the reinforcing rib 21, reduce material usage, and disperse stress. The reinforcing rib 21 inside the buoyancy device 20 has an opening in the middle, which allows the entire box to be connected, maintains a consistent air pressure, and facilitates subsequent water injection for ballast.

[0031] In this embodiment, the distance between two adjacent reinforcing ribs 21 can be set to 2-4m, preferably 3m. The thickness of the reinforcing rib 21 can be set to 7-9mm, preferably 8mm, but is not limited here.

[0032] In this embodiment, the buoyancy of the buoyancy device 20 can be set to 6000-8000t, preferably 7000t; the weight of the buoyancy device 20 can be set to 1000-1200t, preferably 1100t, and is not limited here.

[0033] Preferably, the buoyancy device 20 adopts a hollow rectangular floating box structure. The floating box provides buoyancy in the following example: the floating box is arranged in the entire horizontal layer at the bottom of the main body of the jacket 10. The box size is 50×70×2m. A reinforcing rib 21 is arranged every 3m. The thickness of the box and the reinforcing rib 21 is set to 8mm. The buoyancy of the box is 7000t, and the self-weight of the box is 1100t. The box can provide 5900t of buoyancy for the entire structure of the jacket 100 of the offshore platform, which can effectively reduce the lifting capacity requirement of the crane to 5900t.

[0034] Reference Figures 6 to 9 In some embodiments, the sidewalls and bottomwalls of the buoyancy device 20 are connected to the horizontal circular tubes of the jacket body 10; or the sidewalls of the buoyancy device 20 are connected to the horizontal circular tubes of the jacket body 10; or the sidewalls and topwalls of the buoyancy device 20 are connected to the horizontal circular tubes of the jacket body 10.

[0035] During manufacturing, the main body 10 of the jacket frame is a traditional jacket frame 100. The buoyancy device 20 is located on the lowest horizontal layer of the jacket frame 100 and is welded to the circular tube of the horizontal layer. It can be arranged in a partial area or the entire horizontal layer according to the buoyancy requirements. The vertical relative position of the buoyancy device 20 to the horizontal layer is shown in the figure. Figures 6 to 8 The buoyancy device 20 can be positioned in three ways: (1) the side wall and bottom of the buoyancy device 20 are connected to the horizontal layer circular tube, such as... Figure 6 As shown; (2) The side wall of the buoyancy device 20 is connected to the horizontal circular tube, as shown. Figure 7 As shown; (3) The side wall and top of the buoyancy device 20 are connected to the horizontal circular pipe, as shown. Figure 8 As shown.

[0036] When the jacket structure 10 is lowered to the seabed mud surface, there will be a certain amount of settlement. If the surface soil is of poor quality, the settlement will be greater, and the third structure can be selected; if the surface soil is of good quality, the settlement will be smaller, and the first structure can be selected; if the settlement is moderate, the second structure can be selected. The height of the buoyancy device 20 is determined by the buoyancy required; the higher the buoyancy device, the larger the drainage volume and the greater the buoyancy.

[0037] During installation, such as Figure 9 As shown, the jacket 100 can be transported vertically using a semi-submersible vessel 200. Upon reaching the installation location, the semi-submersible vessel 200 submerges until the buoyancy device 20 is completely submerged. At this point, the buoyancy device 20 provides full buoyancy, and the crane vessel 300 can begin lifting and lowering it. During lowering, an air compressor injects air into the buoyancy device 20, while simultaneously monitoring the pressure within the tank. The pressure inside the tank is gradually increased according to the lowering depth until it is approximately the same as the water pressure at the tank's location. After the jacket 100 is lowered to the mud surface, the crane can detach its hook, and a diver enters the water to open the inlet valve at the water inlet 20c. Simultaneously, the air compressor begins to exhaust air, and seawater is injected into the buoyancy device 20 through the water inlet 20c. The gas inside the tank is discharged through the air injection pipe. Subsequently, the jacket 100 needs to be secured with steel piles. Injecting water into the tank increases the structural weight, enhancing overall stability before the jacket 100 is fixed.

[0038] In summary, this utility model provides buoyancy by setting up the buoyancy device 20, which significantly reduces the lifting capacity requirements of the crane on the crane vessel 300; the offshore platform jacket 100 of this utility model can be installed by hoisting instead of sliding installation, which improves the reliability of the installation process and avoids the complex process of underwater righting; the buoyancy device 20 of this utility model effectively solves the problem of settlement during the installation of the jacket 100 by bearing a large area.

[0039] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An offshore platform jacket, characterized in that, include: The main body of the guide frame; as well as A buoyancy device is located at the bottom of the main body of the jacket. The buoyancy device has a cavity and air holes and water holes that are respectively connected to the cavity. The air holes are used to connect to the air compressor on the work vessel through an air injection pipe, and the water holes are used to fill the cavity with water after the main body of the jacket is lowered.

2. The offshore platform jacket of claim 1, wherein, The buoyancy device is a hollow, sealed structure, and its shape is a cylinder, cuboid, cube, or irregular shape.

3. The offshore platform jacket as described in claim 2, characterized in that, The buoyancy device is provided with several reinforcing ribs, which are arranged vertically to connect the top and bottom surfaces of the buoyancy device.

4. The offshore platform jacket of claim 3, wherein, The reinforcing rib is provided with a plurality of spaced-apart connecting holes to connect the cavities on both sides of the reinforcing rib, reduce material usage, and disperse stress.

5. The offshore platform jacket of claim 3, wherein, The distance between two adjacent reinforcing ribs is 2-4m; and / or the thickness of the reinforcing ribs is 7-9mm.

6. The offshore platform jacket of claim 1, wherein, A water inlet valve is provided at the water hole.

7. The offshore platform jacket of claim 1, wherein, Both the air vent and the water vent are located on the top surface of the buoyancy device.

8. The offshore platform jacket as described in claim 1, characterized in that, The buoyancy of the buoyancy device is 6000-8000t; and / or the weight of the buoyancy device is 1000-1200t.

9. The offshore platform jacket of claim 1, wherein, The sidewalls and bottomwalls of the buoyancy device are connected to the horizontal circular tubes of the guide frame body; or The sidewall of the buoyancy device is connected to the horizontal circular tube of the guide frame body; or The sidewalls and topwalls of the buoyancy device are connected to the horizontal circular tubes of the main body of the guide frame.

10. The offshore platform jacket of claim 9, wherein, The buoyancy device is welded to the guide frame as a whole.

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