CN119929084A - A hollow cylindrical floating production storage and offloading device - Google Patents
A hollow cylindrical floating production storage and offloading device Download PDFInfo
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- CN119929084A CN119929084A CN202510214067.3A CN202510214067A CN119929084A CN 119929084 A CN119929084 A CN 119929084A CN 202510214067 A CN202510214067 A CN 202510214067A CN 119929084 A CN119929084 A CN 119929084A
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Abstract
本发明公开了一种中空圆筒形浮式生产储卸油装置，该中空圆筒形浮式生产储卸油装置由下浮体、上部组块和系泊缆组成，下浮体包括主甲板，主甲板上设置有上部组块，主甲板远离上部组块一侧依次设有外漂甲板箱、上中空环柱形筒体、圆台形过渡段、下中空环柱形筒体和垂荡体，以使下浮体呈圆筒形设置；下浮体上连接有系泊缆，系泊缆近端通过锚系开槽固定在垂荡体上，系泊缆远端固定在海底；上部组块连接有钢质悬链线立管，钢质悬链线立管穿过下浮体与海底井口连接。本发明提供的中空圆筒形浮式生产储卸油装置通过在下浮体内设置上下贯通的大尺寸月池，有效减小平台在位设计吃水的水线面面积，提高了平台垂荡固有周期而避开波浪主能量周期范围。
The present invention discloses a hollow cylindrical floating production storage and offloading device, which consists of a lower buoy, an upper assembly and a mooring cable. The lower buoy includes a main deck, on which an upper assembly is arranged. The main deck is provided with an outer buoy deck box, an upper hollow annular cylindrical cylinder, a truncated cone transition section, a lower hollow annular cylindrical cylinder and a heave body in sequence on the side of the main deck away from the upper assembly, so that the lower buoy is arranged in a cylindrical shape; a mooring cable is connected to the lower buoy, the proximal end of the mooring cable is fixed to the heave body through an anchor groove, and the distal end of the mooring cable is fixed to the seabed; the upper assembly is connected to a steel catenary riser, and the steel catenary riser passes through the lower buoy and is connected to the seabed wellhead. The hollow cylindrical floating production storage and offloading device provided by the present invention effectively reduces the water plane area of the platform's in-situ design draft by arranging a large-sized moon pool that passes through the lower buoy, thereby increasing the platform's heave natural period and avoiding the wave main energy period range.
Description
Technical Field
The invention belongs to the technical field of ocean oil gas development, and particularly relates to a hollow cylindrical floating production oil storage and discharge device.
Background
Currently, an FPSO (floating production, storage and offloading) is one of the main equipment for offshore oil and gas field development, wherein the cylindrical FPSO is in a central axis symmetrical structure as a whole, is insensitive to environmental directivity due to isotropy of hydrodynamic characteristics, and an extended mooring system can be adopted, so that a single point mooring system is avoided. Compared with ship-shaped FPSOs, the cylindrical FPSOs are compact in structure, the sagging and the midspan effects are not obvious, and the floating bodies with symmetrical shapes and the simple structure are more suitable for modularized design and construction. Cylindrical FPSOs typically employ heave cabins with large bottom diameters to add motion add mass and damping to improve hull motion performance.
However, like a ship-shaped FPSO, a cylindrical FPSO also has a larger water plane area, the inherent period of motion is still insufficient to avoid the wave energy period range under typhoon sea conditions, the motion performance is not as good as semi-submersible under large sea conditions, and the suspension requirement of a Steel Catenary Riser (SCR) cannot be met.
Therefore, there is a need to design a hollow cylindrical floating production storage and offloading device that solves the above-mentioned problems.
Disclosure of Invention
In order to solve the technical problems that the motion performance of the cylindrical FPSO is not as high as that of the semi-submerged under the sea condition and the suspension requirement of the steel catenary riser mentioned in the background technology can not be met, the hollow cylindrical floating production oil storage and discharge device is provided, so that the problems of oil storage requirement and the suspension requirement of the steel catenary riser are solved.
In order to achieve the above purpose, the specific technical scheme of the hollow cylindrical floating production oil storage and discharge device is as follows:
A hollow cylindrical floating production oil storage and discharge device comprises a lower floating body, an upper assembly and a mooring cable, wherein the lower floating body comprises a main deck, the upper assembly is arranged on the main deck, a outward drift deck box, an upper hollow annular cylindrical barrel, a round platform-shaped transition section, a lower hollow annular cylindrical barrel and a heave body are sequentially arranged on one side, far away from the upper assembly, of the main deck, so that the lower floating body is in a cylindrical shape, the lower floating body is connected with the mooring cable, the proximal end of the mooring cable is fixed on the heave body through an anchor system slot, the distal end of the mooring cable is fixed on the sea floor, the upper assembly is connected with a steel catenary riser, and the steel catenary riser penetrates through the lower floating body and is connected with a seabed wellhead.
Further, the process deck of upper portion chunk is set up on the main deck through the support, is provided with the wind-through wave wall between process deck and the main deck.
Further, outward drift deck cases, an upper hollow annular cylindrical barrel, a round table-shaped transition section, a lower hollow annular cylindrical barrel and a heave body are sequentially connected to form an annular cylindrical closed structure with unequal diameters, and the inner hollow part is a moon pool which is penetrated up and down.
Further, a plurality of anchor slots are arranged on the heave body, and each anchor slot is penetrated by a mooring rope.
Further, the horizontal section of the lower hollow ring cylindrical barrel is annular, and one end of the lower hollow ring cylindrical barrel, which is far away from the truncated cone-shaped transition section, is in butt joint with the heave body.
Further, a plurality of steel catenary risers are arranged in the moon pool.
Further, a plurality of radial bulkheads and annular bulkheads are arranged in the lower floating body, and a ballast water tank and a crude oil tank are separated through the radial bulkheads and the annular bulkheads.
Further, the ballast water tank is provided with an inner ring and an outer ring which are symmetrically arranged in the lower floating body in a ring shape so as to protect the crude oil tank.
Further, the crude oil tank is annularly arranged between the inner ring ballast water tank and the outer ring ballast water tank above the heave body, and the outer ring ballast water tank is annularly provided with an anchor chain tank.
Further, a diesel tank and a fresh water tank are symmetrically arranged on one side of the inner ring ballast water tank close to the moon pool, and a dirty oil tank and a chemical tank are symmetrically arranged on one side of the inner ring ballast water tank far away from the moon pool.
The hollow cylindrical floating production, storage and discharge device has the following advantages:
(1) Through the large-size moon pool which is vertically communicated in the lower floating body, the water plane area of the platform for in-place design draft is effectively reduced, and compared with a traditional cylindrical FPSO, the heave natural period of the platform can be improved, and the wave main energy period range is avoided. The sea water motion in the moon pool is coupled with the floating body motion, so that an obvious damping effect can be provided, and the overall motion performance of the platform is greatly improved compared with that of a cylindrical floating type production, storage and discharge device;
(2) The large-volume heave body and the damping plate at the bottom of the platform are designed, so that the additional mass and damping in the motion process of the platform are increased, the motion performance of the platform can be further improved, the self-floating stability of the platform is effectively improved, the draft of an empty ship is reduced, the integral construction and joint debugging of the upper block and the lower floating body in a construction site with limited water depth of a wharf and a channel are facilitated, and the water depth requirement of the channel in the towing process is reduced;
(3) The large-size moon pool design has the advantages that the inner space has a certain shielding effect on external seawater, can be used for arranging steel catenary risers or drilling and repairing risers and related equipment, and reduces the risk of damage and failure of related facilities caused by external seawater slapping or ship striking;
(4) The lower floating body is internally provided with a ballast water tank, a crude oil tank, a ballast water tank and a moon pool, so that double-shell and double-bottom protection of the internal crude oil tank is formed, and the risk of crude oil leakage caused by collision of an external oil delivery ship or drilling and repairing equipment and a vertical pipe with the lower floating body is avoided;
(5) The compact round deck can adopt a small-sized modularized upper block structure, so that the weight of the block is further reduced, and the modularized construction and assembly integration are facilitated.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a hollow cylindrical floating production, storage and offloading unit of the present invention;
FIG. 2 is a schematic view of the internal compartment division below the main deck of the hollow cylindrical floating production, storage and offloading of the present invention;
FIG. 3 is a schematic view showing the division of the inner cabin of the lower hollow annular cylinder of the hollow cylindrical floating production, storage and discharge device;
FIG. 4 is a schematic view of the hollow cylindrical floating production, storage and offloading unit of the present invention in a longitudinal cross-sectional view;
fig. 5 is a cross-sectional view of the position A-A of fig. 4.
The figure indicates:
1. The hydraulic system comprises a lower floating body, a2 upper assembly, a3, outward drift deck box, a4 upper hollow annular cylindrical barrel, a 5 truncated cone-shaped transition section, a 6 lower hollow annular cylindrical barrel, a 7, a heave body, a 8, a process deck, a 9, a wind-through breakwater wall, a 10, a main deck, a 11, mooring lines, a 12, a steel catenary riser, a 13, a moon pool, a 14, an anchor slotting, a 15, a ballast water tank, a 16, a crude oil tank, a 17, a dirty oil tank, a 18, a chemical tank, a 19, a diesel tank, a 20, an anchor chain tank, a 21, a fresh water tank, a 22, a damping plate, a 23, a radial bulkhead, a 24 and an annular bulkhead.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The hollow cylindrical floating production storage and offloading apparatus of the present invention will be described with reference to fig. 1 to 5.
As shown in figure 1, the hollow cylindrical floating production, storage and offloading device comprises a lower floating body 1, an upper assembly 2 and mooring cables 11, wherein the lower floating body 1 comprises a main deck 10, the upper assembly 2 is arranged on the main deck 10, a outward drift deck box 3, an upper hollow annular cylindrical barrel 4, a truncated cone-shaped transition section 5, a lower hollow annular cylindrical barrel 6 and a heave body 7 are sequentially arranged on one side, far away from the upper assembly 2, of the main deck 10, so that the lower floating body 1 is in a cylindrical arrangement, the lower floating body 1 is connected with the mooring cables 11, the proximal ends of the mooring cables 11 are fixed on the heave body 7 through anchor grooves 14, the distal ends of the mooring cables 11 are fixed on the seabed, the upper assembly 2 is connected with a steel catenary riser 12, and the steel catenary riser 12 penetrates through the lower floating body 1 and is connected with a seabed wellhead.
Through the large-size moon pool 13 which penetrates up and down is arranged in the lower floating body 1, the water plane area of the platform in-place design draft is effectively reduced, and compared with a traditional cylindrical FPSO, the heave natural period of the platform can be improved, and the wave main energy period range is avoided. The sea water motion in the moon pool 13 is coupled with the floating body motion, so that an obvious damping effect can be provided, and the overall motion performance of the platform is greatly improved compared with that of a cylindrical floating type production, storage and discharge device.
Further, as shown in fig. 1, the process deck 8 of the upper assembly 2 is arranged on the main deck 10 through a support, a wind-penetrating wave wall 9 is arranged between the process deck 8 and the main deck 10, a outward drift deck box 3, an upper hollow annular cylindrical cylinder 4, a truncated cone-shaped transition section 5, a lower hollow annular cylindrical cylinder 6 and a heave body 7 are sequentially connected to form an annular column type closed structure with unequal diameters, the hollow part inside is a moon pool 13 which penetrates up and down, an anchor slot 14 is arranged on the heave body 7, and a mooring cable 11 passes through the anchor slot 14.
In this embodiment, the lower floating body 1 preferably adopts a loop column type closed structure with unequal diameters up and down, a moon pool 13 is formed at the central portion, the bottom is connected with the mooring line 11, and the top supports the upper block 2. The heave body 7 is positioned at the bottom of the lower floating body 1 and is an annular closed structure with a boss-shaped vertical section, and the outer side, the inner side and the bottom of the heave body are adjacent to external seawater.
The outer side of the heave body 7 can be provided with a plurality of groups of anchor slots 14 according to the requirements of the mooring lines 11, in the embodiment, the mooring lines 11 are formed by 3 groups of mooring systems, one group comprises 5 mooring lines, 3 anchor slots 14 which are convenient for arranging the mooring lines 11 are arranged on the heave body 7, and the anchor slots 14 are preferably connected with the upper part of the lower floating body 1 through a mounting chain, and the anchor slots 14 are connected with the sea bottom through the mooring lines 11.
Further, as shown in fig. 1 to 3, the horizontal section of the lower hollow annular cylindrical barrel 4 is annular, one end of the lower hollow annular cylindrical barrel 6, which is far away from the truncated cone-shaped transition section 5, is in butt joint with the heave body 7, a plurality of steel catenary risers 12 are arranged in the moon pool 13, a plurality of radial bulkheads and annular bulkheads are arranged in the lower floating body 1, and a ballast water tank 15 and a crude oil tank 16 are separated through the radial bulkheads and the annular bulkheads.
In this embodiment, preferably, the horizontal section of the lower hollow annular cylindrical shell 6 is annular, the bottom of the lower hollow annular cylindrical shell is in butt joint with the heave body 7, the hollow circular truncated cone-shaped transition section 5 is mounted on the lower hollow annular cylindrical shell 6, the upper hollow annular cylindrical shell 4 is mounted on the hollow circular truncated cone-shaped transition section 5, the outer side and the inner side of the outward drift deck box 3 incline towards the outer side and the center side of the platform respectively to form a closed annular structure with an inverted boss-shaped vertical section, the bottom of the closed annular structure is in butt joint with the upper hollow annular cylindrical shell 4, and the top of the closed annular structure is provided with a main deck 10.
The process deck 8 of the upper block 2 is installed on the main deck 10 by a support, and a wind-permeable breakwater 9 is provided between the process deck 8 and the main deck 10 on the side of the board, and the wind-permeable breakwater 9 can protect deck facilities from the slapping of waves and provide natural ventilation for the space between the main deck 10 and the process deck 8.
As a preferred embodiment, the lower floating body 1 is a hollow non-uniform diameter loop column type closed structure, the hollow part of the lower floating body forms a moon pool 13 which penetrates up and down, a steel catenary riser 12 is arranged in the moon pool 13, the steel catenary riser 12 is used for connecting an oil gas treatment system of the upper block 2 with a wellhead positioned on the sea floor, and the steel catenary riser 12 is a production riser. The upper assembly 2 is arranged on the process deck 8, and small modular facilities such as oil and gas treatment process facilities, public facilities, drilling and repairing facilities, torch arms, an external transportation system, living buildings and the like can be arranged on the upper assembly 2 according to the functional requirements of the platform.
Further, as shown in fig. 3 to 5, the ballast water tank 15 is provided with an inner ring and an outer ring, and is symmetrically arranged inside the lower floating body 1 in an annular shape to protect the crude oil tank 16, the crude oil tank 16 is annularly arranged between the inner ring ballast water tank 15 and the outer ring ballast water tank 15 above the heave body 7, the outer ring ballast water tank 15 is annularly provided with an anchor chain tank 20, one side of the inner ring ballast water tank 15 close to the moon pool 13 is symmetrically provided with a diesel tank 19 and a fresh water tank 21, and one side of the inner ring ballast water tank 15 far from the moon pool 13 is symmetrically provided with a dirty oil tank 17 and a chemical tank 18.
In the embodiment, preferably, the whole space of the lower floating body 1 is divided into a ballast water tank 15 and a crude oil tank 16 by a plurality of radial bulkheads 23 and annular bulkheads 24, and the ballast water tank 15 is provided with an inner ring and an outer ring which are symmetrically arranged in the lower floating body 1 in an annular mode, so that double-shell and double-bottom protection of the crude oil tank 16 is realized.
The crude oil tank 16 is annularly arranged between the inner ring ballast water tank 15 and the outer ring ballast water tank 15 above the heave body 7, the anchor chain tank 20 is annularly arranged in the outer ring ballast water tank 15, the diesel oil tank 19 and the fresh water tank 21 are symmetrically arranged on one side of the inner ring ballast water tank 15 close to the moon pool 13, and the dirty oil tank 17 and the chemical tank 18 are symmetrically arranged on one side of the inner ring ballast water tank 15 far from the moon pool 13, so that double-shell protection is formed.
As a preferred embodiment, the FPSO is designed with a draft at the upper hollow annular cylindrical body 4, the draft being designed to be about 65% -78% of the FPSO type depth. In the design position, the diameter of the moon pool 13 is about 60% of the outer diameter of the upper hollow annular cylindrical barrel 4, and in the lower hollow annular cylindrical barrel 6, the diameter of the moon pool is about 45% of the outer diameter of the lower hollow annular cylindrical barrel. The outer diameter of the upper hollow annular cylinder 4 is about 75% of the maximum outer diameter of the bottom of the heave body 7.
The design of the annular column type closed structure with unequal diameters at the upper and lower parts ensures that the FPSO has smaller water plane area in the design draft range so as to improve the motion performance and also has larger drainage quantity, thereby meeting the requirement of the oil storage function, and the sea water motion in the moon pool 13 is coupled with the floating body motion, so that obvious damping effect can be generated and the overall motion performance of the platform is greatly improved.
In addition, the design of the large-volume heave body 7 at the bottom of the platform and the horn-shaped opening and the damping plate 22 at the bottom of the moon pool 13 further increases the additional mass and damping in the motion process of the platform, and can further improve the motion performance of the platform.
The experimental study of the pool model shows that the heave motion of the platform under the extreme condition can be controlled within 5 meters, the swing motion can be controlled within 7 degrees, the suspension requirement of the steel catenary riser SCR can be met, and the function expansion of the conventional FPSO is realized. The design of the large-volume heave body 7 effectively improves the self-floating stability of the platform and reduces the draft of an empty ship, and is beneficial to realizing the integral construction and joint debugging of the upper assembly block 2 and the lower floating body 1 in a construction site with limited water depth of a wharf and a channel and reducing the water depth requirement of the channel in the towing process.
The steel catenary riser 12 or the drilling and repairing riser and related equipment are arranged in the moon pool 13, so that shielding protection for related facilities can be formed, and the risk of damage failure of the related facilities caused by external sea water slapping or ship impact is reduced.
The hollow cylindrical floating type production, storage and unloading device is characterized in that the upper and lower through large-size moon pool 13 is arranged in the lower floating body 1, so that the water plane area of the platform in-situ design draft is effectively reduced, and compared with a traditional cylindrical FPSO, the heave natural period of the platform can be improved, and the wave main energy period range is avoided. The sea water motion in the moon pool 13 is coupled with the floating body motion, so that an obvious damping effect can be provided, and the overall motion performance of the platform is greatly improved compared with that of a cylindrical floating type production, storage and discharge device.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A hollow cylindrical floating production oil storage and discharge device is composed of a lower floating body, an upper assembly and a mooring cable, and is characterized in that the lower floating body comprises a main deck, the upper assembly is arranged on the main deck, a outward drift deck box, an upper hollow annular cylindrical body, a round platform-shaped transition section, a lower hollow annular cylindrical body and a heave body are sequentially arranged on one side, far away from the upper assembly, of the main deck, so that the lower floating body is in a cylindrical shape, the lower floating body is connected with the mooring cable, the near end of the mooring cable is fixed on the heave body through an anchor system slot, the far end of the mooring cable is fixed on the seabed, the upper assembly is connected with a steel catenary riser, and the steel catenary riser penetrates through the lower floating body and is connected with a seabed wellhead.
2. The hollow cylindrical floating production storage and offloading unit of claim 1, wherein the upper block process deck is supported on the main deck with a wind-permeable breakwater between the process deck and the main deck.
3. The hollow cylindrical floating production, storage and unloading device according to claim 1, wherein outward drift deck boxes, an upper hollow annular cylindrical barrel, a truncated cone-shaped transition section, a lower hollow annular cylindrical barrel and a heave body are sequentially connected to form an annular cylindrical closed structure with unequal diameters, and an inner hollow part is a moon pool which penetrates up and down.
4. A hollow cylindrical floating production, storage and offloading unit according to claim 3, wherein the heave body is provided with a plurality of anchor slots, each anchor slot being provided with a mooring line therethrough.
5. The hollow cylindrical floating production, storage and offloading device of claim 1, wherein the lower hollow annular cylinder is annular in horizontal cross section, and the end of the lower hollow annular cylinder remote from the truncated cone-shaped transition section is in butt joint with the heave body.
6. The hollow cylindrical floating production, storage and offloading unit of claim 2, wherein a plurality of steel catenary risers are disposed within the moon pool.
7. The hollow cylindrical floating production, storage and offloading unit of claim 1, wherein the lower float has a plurality of radial bulkheads and annular bulkheads inside, and wherein the ballast water tank and the crude oil tank are separated by the radial bulkheads and the annular bulkheads.
8. The hollow cylindrical floating production, storage and offloading apparatus of claim 7, wherein the ballast tank is provided with two rings, an inner ring and an outer ring, and is disposed inside the lower floating body in a ring-shape symmetrical arrangement to protect the crude tank.
9. The hollow cylindrical floating production, storage and offloading apparatus of claim 8, wherein the crude oil tanks are annularly disposed between inner and outer ring ballast tanks above the heave body, the outer ring ballast tanks being annularly provided with chain tanks.
10. The hollow cylindrical floating production, storage and offloading apparatus of claim 9, wherein a diesel tank and a fresh water tank are symmetrically disposed on a side of the inner ring ballast water tank close to the moon pool, and a dirty oil tank and a chemical tank are symmetrically disposed on a side of the inner ring ballast water tank far from the moon pool.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510214067.3A CN119929084A (en) | 2025-02-26 | 2025-02-26 | A hollow cylindrical floating production storage and offloading device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510214067.3A CN119929084A (en) | 2025-02-26 | 2025-02-26 | A hollow cylindrical floating production storage and offloading device |
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| CN119929084A true CN119929084A (en) | 2025-05-06 |
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| CN202510214067.3A Pending CN119929084A (en) | 2025-02-26 | 2025-02-26 | A hollow cylindrical floating production storage and offloading device |
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