Spar platform with closed central shaft

FIELD: transport.

SUBSTANCE: invention relates to sea oil extraction platforms. Proposed SPAR platform 200 comprises hull 2202 with central hast 204. Air- and watertight partition 210 runs across central shaft to make variable-buoyancy compartment 220 in central shaft. In compliance with some versions, central shaft bottom is exposed in sea, while in compliance with other versions, central shaft bottom is sealed. At least one pipe 224 to house riser 227 runs through partition and said variable-buoyancy compartment. Said pipe has exposed top face to allows drainage of water accumulated in central shaft to make air- and watertight seal in joint with bulkhead. In some versions, two or more air- and watertight partitions 206, 208, 210 are arranged across central shaft to form one or more air- and watertight ballast tanks 216, 218 arranged fixed between every adjacent pair of bulkheads.

EFFECT: increased platform buoyancy due to its adjustment by central shaft.

16 cl, 4 dwg

 

Background of invention

The technical field of the invention

The present invention relates to offshore drilling and production platforms, including platforms such as SPAR, i.e. large manned floating platforms, tank farms with single buoy mooring bulk on offshore installations.

Description of the prior art

Offshore drilling and production platforms-type SPAR typically include a vertically elongated buoyant hull. For example, figure 1 shows a variant of the platform 100 type SPAR with the outer casing 102 with a hollow Central shaft 104, which lower end is open into the sea, while the upper end is open to the atmosphere. The housing 102 is a deck (not shown), on which you can install the equipment drilling and production (not shown), along with other designs. The housing 102 includes many tanks 106 buoyancy surrounding the Central shaft 104. Tank 106 to form cavities or compartments 108, which can be selectively filled with air or water to create varying degrees of buoyancy of the platform 100. Ballast tanks 106 are down to the truss 110, passing down to the loaded ballast to the keel 112. Loaded with ballast keel 112 in the lower part of the truss 110 lowers the center of gravity of the platform 100 and improves the stability of the platform 100. One renesola anchor braces (not shown) can be used to hold the platform 100 in the workplace.

Platform type SPAR is usually used in conjunction with one or more risers passing under tension from the platform to the wellhead or the anchor on the seabed. For example, the platform 100 in figure 1 includes the riser 116, with tension in the upper part. The riser 116, with tension in the upper part of the pass down through the Central shaft 104 from the hydro-pneumatic pull-up devices (not shown)supported on the carrier frame 118 raiser with tension in the upper part. The housing 102 carries a carrier frame 118 above the water surface 120 (e.g., sea). In alternative platforms such as SPAR risers with tension in the upper part can carry a cylindrical buoy (not shown), floating in the open Central shaft. This configuration is disclosed in U.S. patent No. 6176646, the description of which is fully incorporated herein by reference. Alternative platform type SPAR can include catenary risers and/or risers with the tension of the lower part, which is used to move around the field lines of oil and/or gas from remote fields or to move around the field lines of oil and/or gas to shore or to other platforms. These risers are usually placed in an open Central shaft, and the platform may include pipe tension or pipe protective membranes that surround the riser and keeping them in casinojobnet. In some cases, chain risers can be placed outside the platform and run along the cut length of the platform. Pipes for other services, open at the bottom, also can be placed in a Central pit.

As is clear from figure 1, the Central shaft 104 is open in the sea to its lower end and filled with seawater. Accordingly, the Central shaft 104 does not contribute to the buoyancy of the platform 100.

The INVENTION

Preferred embodiments of this platform type SPAR have few symptoms, none of which by itself is not responsible for their desirable attributes. Without limiting the scope of the present embodiments, are described in the following claims, the most important signs should be briefly discussed here. After taking into account the description and particularly after reading the section "Detailed description of preferred embodiments of the invention should be understood as signs of these embodiments of the invention create some benefits, including, without limitation, increased buoyancy, reduced size and weight, and simple and effective means for regulating the buoyancy of the platform when conditions change.

One aspect of this platform type SPAR includes the implementation of the penny is the real mine the usual platform type SPAR, open sea and flooded. Thus, the Central shaft does not contribute to the buoyancy of the platform. The sealing part or the whole of the Central shaft may increase the buoyancy of the platform and to provide adjustment of the Central shaft buoyancy of the platform. The sealing part or the whole of the Central shaft may also contribute to the reduction of diameter and size platform type SPAR, thereby reducing the weight. Reducing weight and volume may also improve the possibility of construction and transportation platform type SPAR entirely, using existing large-capacity vessels.

In General, platform type SPAR, according to the present invention, includes a housing, a Central shaft located in the housing having a lower end opened in the sea, a transverse partition located in the Central shaft for education compartment variable buoyancy in the lower end of the Central shaft, and a tube passing through the wall and compartment and forming an airtight and waterproof seal at the junction with the partition.

In one particular embodiment, the partition wall is airtight and waterproof the deck. In another specific embodiment, the partition contains at least first and second airtight and dial : iceme deck, forming airtight and waterproof fixed ballast tank between them, with a pipe passing through the fixed ballast tank from the first deck through the second deck and through the compartment. The pipe can preferably be performed with placement of the riser passing through it. The pipe forms an airtight and watertight seal in their respective junctions with the first and second decks.

When used in this document the terms "invention" and "the present invention" should be understood as covering the invention described in this document, in its various embodiments and aspects, as well as any equivalents available to specialists in this field of technology.

BRIEF DESCRIPTION of DRAWINGS

Preferred embodiments of the invention the present platform type SPAR described in detail below with an illustration of the preferred characteristics. These options implementation represent a new and unobvious platform type SPAR shown in the accompanying drawings, only illustrative purposes that depict the following:

Figure 1 shows a side view cross-section of a known platform type SPAR.

Figure 2 shows a side view cross section of one possible implementation of this platform type is PAIRS.

Figure 3 shows a top view cross-section of the platform type SPAR, along the line 3-3 in figure 2.

Figure 4 shows a top view cross-section of the platform type SPAR Figure 2, along the line 4-4 in figure 2.

DETAILED DESCRIPTION of embodiments of the INVENTION

Figure 2 shows a side view cross-section of a variant of implementation of the platform 200 type SPAR according to the invention. While the present embodiments of described herein with reference to the truss platform type SPAR, specialists in the art will understand that these embodiments of cover any floating drilling and/or production platform or vessel having a configuration with an open Central shaft.

As shown in figure 2, the platform 200 includes a housing 202 having a Central shaft 204. The Central shaft 204 has an upper end open to the atmosphere, and the lower open sea. Many airtight and waterproof walls 206, 208, 210 are essentially horizontally across the Central shaft 204. In a specific embodiment, one or more walls 206, 208, 210 can be made in the form of air-permeable and water-permeable deck. For simplicity, in the description of the walls 206, 208, 210 will be referred to as decks, although in some embodiments implement one or more data partitions 206, 208, 210 may not be in sucheerweiterte or waterproof.

The first and second deck 206, 208 is formed between the first fixed airtight and waterproof ballast tank 216. The second and third deck 208, 210 formed between the second fixed airtight and waterproof ballast tank 218. One or more load-bearing or guide frame 214 can pass across the Central shaft 204 below the third deck 210. In the shown embodiment, there are two bearing or guide frame 214, and the lower frame 214 is placed near the lower end of the Central shaft 204, as shown in figure 2 and 4. Specialists in the art will understand that it can be used more or fewer load-bearing or guide frame 214. The function of bearing or guide frame 214 are discussed in detail below.

Many tubes 224 are essentially in the vertical (axial) direction through the Central shaft 204 from the upper deck 206 to the lower part of the Central shaft 204. In the shown embodiment shows five tubes 224, but it should be clear that it is possible to equip with less or more tubes 224. One of the tubes 224, preferably near the center of the Central shaft 204 may be a pipe a drilling shaft (Fig 3 and 4), and it can have a larger diameter than the other tube 224 to create a drill shaft 225, NR passing the C from the upper deck 206 to the lower end of the Central shaft 204. Pipe 224, a lean on bearing or rails of the frame 214, when passing through the Central shaft 204 below decks 206, 208, 210. Pipe 224 preferably have dimensions that allow the placement of risers 227, which may be a riser with tension in the upper part of the riser with the tension of the lower part or steel catenary risers, as with protective membranes (not shown), and without them. The risers with tension in the upper part can rely on carrier frame 229 riser with tension in the upper part with associated conventional tensioning devices (not shown), well known in the prior art. Other pipe content and/or tension (not shown), such as for catenary risers, umbilicals, mud pits and/or caissons can also be equipped in the Central shaft 204.

The housing 202 includes many of the buoyancy tanks or heavy tanks 226 surrounding the Central shaft 204. Tank 226 can be selectively adjustable to fill with air or water, by conventional means, to create varying degrees of buoyancy of the platform 200. Tank 226 pass down to the truss 230, which runs down to the loaded ballast keel 232. Kiel 232 in the lower part of the truss 230 lowers the center of gravity of the platform 200 and improves the stability of the platform 200. One or more acornhoek (not shown) can be used to hold the platform 200 in place. Specialists in the art should be understood that some embodiments of the present platform type SPAR may not include a truss or loaded with ballast keel.

As described above, the deck 206, 208, 210 are airtight and waterproof. Accordingly, the intersection of pipes 224, a with decks 206, 208, 210 are similarly airtight and waterproof. For example, pipes 224, a can be welded to the decks 206, 208, 210 in the manner ensuring airtightness and watertightness. Specialists in the art should understand that used here, the term "tube" includes both designs, both continuous and segmented. Thus, each pipe 224, a can contain a single piece of a length of material passing from the upper deck 206 to the bottom of the carrier or frame rail 214, or each pipe 224, a can be made of many short sections that can be joined together and/or to connect with decks 206, 208, 210 and the guide frames 214. In the variants of implementation, in which the pipe (pipes) 224, a made of many short sections, the holes in the deck (decks) 206, 208, 210 can be considered part of the pipe.

In some embodiments, the implementation of the airtight and waterproof is by ballast tanks 216, 218 filled with air, which contributes to the buoyancy of the platform 200 type SPAR. Since the pipes 224, a passing through the fixed ballast tanks 216, 218, similarly, are airtight and waterproof, as the joints of pipes 224, a with decks 206, 208, 210, no water in the pipes 224 should not leak into fixed ballast tanks 216, 218 and disrupt their contribution to the buoyancy of the platform 200 type SPAR. Additionally, pipes 224 have open upper ends in the upper deck 206, so that all the water accumulating on the deck 206, flowed through the tube 224 into the sea.

Compartment 220 of the variable buoyancy, limited from below the lower deck 210 has an open bottom, coinciding with the open bottom of the Central shaft 204. Since this compartment 220 of the variable buoyancy, also referred to as a chamber of compressed air above the water, open sea, sea water 222 may naturally move into compartment 220 and out of it. The amount of air and water in the compartment 220 of the variable buoyancy can be adjusted by adding air from a compressed air source (not shown) or bleed air from the compartment 220 in the sea or in the atmosphere. Compressed air supply and bleed air can be done in the usual mechanisms, well known in the prior art and therefore not in need of description in the detailed description of the invention. When a regulated change in the ratio of water and air in the compartment 220, the contribution of the compartment 220 of the variable buoyancy the buoyancy of the platform 200 may be adjustable to adjust. As pipe 224 passing through the compartment 220 of the variable buoyancy, are airtight and waterproof, no air and/or water in the pipes 224 should not leak into the compartment 220 changes in buoyancy with an open bottom and break his contribution to the buoyancy of the platform 200 type SPAR.

In some embodiments of the invention, the tubes 224 are open at both ends. Pipe 224, thus, partially filled with sea water incoming through the lower end of each pipe 224. As mentioned above, the pipe 224 also preferably act as drainage channels for the upper deck 206. Water or other liquids collecting on the deck 206, can flow into the open upper ends of the tubes 224 and drain down the pipe 224 to the level of sea water in each sleeve 224. Drainage preferably prevents excessive accumulation of liquid on the deck 206, which can lead to weight gain on the top end of the platform 200 and may disrupt the stability of the platform 200 or to cause movement of the fluid or other harmful effects.

In embodiments of the invention described above, preferably created watertight compartments 216, 18 in the Central shaft 204, increasing the buoyancy of the platform 200 type SPAR. Sealing the lower part of the Central shaft 204, at least one airtight and watertight transverse bulkhead or deck is also preferably helps to reduce the diameter and size of the platform 200 type SPAR, thereby creating a savings in weight. Reducing weight and volume also increase the ability of construction and transportation platform type SPAR as a whole, using the existing transport vessels of large capacity.

In embodiments of the invention described above also preferably created compartment 220 of the variable buoyancy or compressed air above the water. Adjustable buoyancy compartment 220 of the variable buoyancy creates a simple and effective means for regulating the buoyancy of the platform 200 type SPAR, when the conditions on Board the platform change. For example, when the risers and/or top equipment installed or removed during the lifetime of the platform 200, the buoyancy compartment 220 of the variable buoyancy can be adjusted to maintain the stability of the platform 200. The buoyancy system compressed air is also preferably simpler than the system water ballasting using marine ballast pumps.

Although shown an implementation option includes three airtight and vodonepronitsaema the haunted deck 206, 208, 210, and two airtight and watertight compartments 216, 218 in the Central shaft 204, those of ordinary skill in the art should be understood that these embodiments of cover the Central shaft containing any number of airtight and watertight decks and compartments. Specifically, the advantages of this platform type SPAR, as described above, can be implemented by applying only one airtight and watertight transverse bulkheads or decks (e.g., deck 206, shown in the drawings). In this embodiment, only the bulkhead separates the Central shaft at the top, open to the atmosphere, and the lower part of the open sea, which creates a compartment 220 of the variable buoyancy, and between two or more decks no ballast tanks. Similarly, if you only created two airtight and watertight bulkheads or decks between them will be established only one ballast tank. In another embodiment, there may be provided three or more such as bulkheads or decks, ballast tank formed between each adjacent pair of bulkheads or decks.

In an alternative embodiment, the present platform type SPAR lower end of the Central shaft can be sealed airtight and in nepronitsaemoi partition. Airtight and watertight bulkhead may be essentially identical to the decks 206, 208, 210, described above and shown in figure 2 and 3. In this embodiment, sea water can not naturally enter the main shaft in and out of her, as in the variants of implementation, shown in Fig.2-4. However, in some embodiments, the implementation, with a closed lower end, sea water can be added to the Central shaft and/or removed from the Central shaft to adjust the buoyancy of the platform. Sea water can be added and/or removed using, for example, pumps (not shown). As in the embodiment of figure 2, airtight and waterproof pipes can pass through the Central shaft and, in some embodiments, implementation, pipes can pass from the top of the bulkhead or deck to the bottom of the bulkhead or deck.

The above description presents the best mode implementation of the present invention, and the mode and manner of its implementation and use, in full, clear, concise and exact terms to enable any person skilled in the art to carry out the implementation and use of this platform type SPAR. The present invention, however, allows modifications and alternative constructions, in addition to the above, in which one equivalent. Therefore, the present invention is not limited to the individual variants of implementation disclosed herein. On the contrary, the present invention covers all modifications and alternative constructions suitable for the nature and scope of the invention, in General expressed by the following claims, particularly pointing and distinctly claiming the main claim.

1. Platform type SPAR for use in offshore drilling or production of fossil fuels on the seabed, comprising a housing, a Central shaft located in the housing, airtight and watertight transverse bulkhead located in the Central shaft for education compartment adjustable variable buoyancy in the Central shaft, and a tube passing through the partition and the specified slot and forming an airtight and waterproof seal when connecting to the specified partition.

2. Platform according to claim 1, in which the Central shaft has a lower end, open into the sea.

3. Platform according to claim 2, in which the compartment controlled variable buoyancy is located at the lower end of the Central shaft.

4. Platform according to any one of claims 1 to 3, which is airtight and watertight transverse bulkhead located in the lower part of the Central pit and isolates the Central shaft from m the OC.

5. Platform according to any one of claims 1 to 3, in which the transverse partition is the first partition, and a second airtight transverse partition, the said partition is formed between a fixed ballast tank.

6. Platform according to claim 5, in which the pipe passes through the first wall, second wall and fixedly mounted ballast tank and forms an airtight and waterproof seal when connecting with the first and second partitions.

7. Platform according to any one of claims 1 to 3, 6, in which the platform has a buoyancy that is adjustable by changing the ratio of air and water in the compartment controlled variable buoyancy.

8. Platform according to claim 7, in which the ratio of air and water in the compartment controlled variable buoyancy is adjustable by selectively adding air into the compartment and removal of air from the compartment.

9. Platform according to claim 7, in which the ratio of air and water in the compartment controlled variable buoyancy is adjustable by selectively adding water to the compartment and removal of water from the Bay.

10. Platform according to any one of claims 1 to 3, 6, 8, 9, in which the pipe is made with the possibility of draining the sea water in the Central pit.

11. The method of adjusting the buoyancy of the platform type SPAR for use in offshore drilling or on the extraction of fossil fuels from beneath the sea, contains adjustable change in the ratio of air and water in the compartment controlled variable buoyancy platform, located in the Central shaft of the platform.

12. The method according to claim 11, in which the adjustable ratio change of air and water in the compartment controlled variable buoyancy of the platform shall be implemented by selectively adding air into the compartment and removal of air from the compartment.

13. The method according to claim 11, in which the adjustable ratio change of air and water in the compartment controlled variable buoyancy of the platform shall be implemented by selectively adding water to the compartment and removing water from the Bay.

14. The method of construction of the platform type SPAR for use in offshore drilling or production of fossil fuels from the sea bottom, containing the following steps: the body Assembly platform, containing a Central shaft; consolidation in the Central mine airtight and watertight transverse bulkhead forming the boundary of the compartment controlled variable buoyancy in the Central shaft; the passage through the said partition and the specified slot of the pipe, forming an airtight and waterproof seal when connecting to the partition.

15. The method according to 14, in which the use of the transverse wall, which is the first partition, and carry out the consolidation of the Torah airtight and watertight transverse bulkhead in the Central shaft, these partitions form a fixed ballast tank.

16. The method according to 14, in which with the passage of the tube through the septum carry out the welding of a pipe with a partition.



 

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