Main deck oily water collecting structure of oil and gas platform

Abstract

The invention discloses a main deck dirty oil water collecting structure of an oil and gas platform, the main deck dirty oil water collecting structure of the oil and gas platform comprises a first dirty oil water collecting module and a second dirty oil water collecting module, the first dirty oil water collecting module and the second dirty oil water collecting module are both arranged below a main deck; the first oily water collecting module is annularly arranged along the center of the main deck, and the second oily water collecting module is connected to the first oily water collecting module along the radial direction of the first oily water collecting module; a plurality of deck holes corresponding to the first oily water collecting module and the second oily water collecting module are formed in the main deck, grids are arranged on the deck holes, and the upper surfaces of the grids and the upper surface of the main deck are located on the same plane, so that oily water flows into the first oily water collecting module and the second oily water collecting module along the deck holes. According to the main deck oily water collecting structure of the oil and gas platform, the collected oily water is finally gathered in the center of the platform, and the influence on the floating state of the cylinder platform is small.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore oil and gas engineering, and particularly relates to a main deck oily water collection structure for a cylindrical offshore oil and gas platform. Background Art

[0002] During the in-service operation stage of a cylindrical offshore oil and gas platform, various equipment on the main deck will undergo different degrees of maintenance, cleaning and other operations. The discharge or leakage of equipment and pipelines, as well as the cleaning of the deck, will generate oily water. In order to avoid the large-area overflow of oily water during the above operations, it is necessary to collect and clean the residual oily water on the main deck in a timely manner.

[0003] For traditional ship-shaped floating structures, due to the existence of the sheer strake structure, the oily water will automatically flow to the side bilge well. However, the main deck of a cylindrical offshore oil and gas platform is a circular plane, and a conventional sheer strake structure cannot be set, resulting in the residual oily water on the main deck overflowing everywhere with the movements of the cylindrical offshore oil and gas platform such as swaying and heaving. The traditional bilge well structure cannot effectively and quickly collect the oily water on the deck. At the same time, the main deck area of a cylindrical offshore oil and gas platform belongs to a Class I hazardous area, with the upper layer being the process deck and having less space for air exchange with the outside world, and there are risks of accumulation of various hazardous gases and liquids. The flowing of the oily water everywhere has an adverse impact on the safety of the platform and personnel.

[0004] Therefore, there is an urgent need to design a main deck oily water collection structure for an oil and gas platform to solve the above-mentioned problems. Summary of the Invention

[0005] In order to solve the technical problem mentioned in the background art that the main deck of an offshore oil and gas platform is a circular plane and a conventional sheer strake structure cannot be set, resulting in the residual oily water on the main deck overflowing everywhere with the movements of the cylindrical offshore oil and gas platform such as swaying and heaving, a main deck oily water collection structure for an oil and gas platform is provided to solve the problem of collecting the oily water on the deck.

[0006] To achieve the above object, the specific technical solution of the main deck oily water collection structure of the oil and gas platform of the present invention is as follows: A main deck oily water collection structure for an oil and gas platform includes a first oily water collection module and a second oily water collection module. Both the first oily water collection module and the second oily water collection module are arranged below the main deck. The first oily water collection module is arranged circumferentially along the center of the main deck, and the second oily water collection module is connected to the first oily water collection module radially along the first oily water collection module. A plurality of deck openings corresponding to the first oily water collection module and the second oily water collection module are opened on the main deck, and gratings are arranged on the deck openings. The upper surface of the gratings is in the same plane as the upper surface of the main deck, so that the oily water flows into the first oily water collection module and the second oily water collection module along the deck openings.

[0007] Furthermore, a plurality of second oily water collection modules are radially spaced and connected to the first oily water collection module, and one end of the second oily water collection module away from the first oily water collection module is connected to the outer ring bulkhead.

[0008] Furthermore, an oily water tank is connected to the first oily water collection module, so that the oily water in the first oily water collection module and the second oily water collection module flows into the oily water tank.

[0009] Furthermore, the first oily water collection module includes a first bottom plate and a first side plate. The first side plate and the inner ring bulkhead are connected to the first bottom plate. The first side plate, the first bottom plate, the inner ring bulkhead and the main deck are sequentially connected to form a first square-section steel bulkhead for collecting oily water.

[0010] Furthermore, the second oily water collection module includes a second bottom plate and a second side plate. The second side plate and the radial bulkhead are connected to the second bottom plate. The second side plate, the second bottom plate, the radial bulkhead and the main deck are sequentially connected to form a second square-section steel bulkhead, and the second square-section steel bulkhead is communicated with the first square-section steel bulkhead.

[0011] Furthermore, a first flat iron support is connected to the second square-section steel bulkhead, and the first flat iron support is fixedly connected to the second side plate and the main deck.

[0012] Furthermore, a second flat iron support is connected to the second square-section steel bulkhead, and the second flat iron support is fixedly connected to the second bottom plate, the second side plate, the radial bulkhead and the main deck respectively.

[0013] Furthermore, a plurality of through holes are spaced and opened at the main deck position of the first square-section steel bulkhead, and grilles are connected to the plurality of through holes, so that the oily water flows into the first square-section steel bulkhead along the plurality of through holes.

[0014] Furthermore, a circular opening and an elliptical opening are opened at the main deck position of the second square-section steel bulkhead, and grilles are connected to the circular opening and the elliptical opening, so that the oily water flows into the second square-section steel bulkhead along the circular opening and the elliptical opening.

[0015] Furthermore, the elliptical opening includes a first elliptical opening, a second elliptical opening, a third elliptical opening and a fourth elliptical opening. The first elliptical opening, the second elliptical opening, the third elliptical opening and the fourth elliptical opening have different sizes and are spaced and opened on the main deck along the length direction of the second square-section steel bulkhead.

[0016] The main deck oily water collection structure of the oil and gas platform of the present invention has the following advantages: By setting up the first oily water collection module and the second oily water collection module to collect oily water, the collected oily water can flow to the oily water tank by relying on its own gravity component without the need to arrange pump equipment, reducing the design difficulty. After the oily water is collected, it flows from the second oily water collection module to the first oily water collection module and then from the first oily water collection module to the oily water tank at the center of the cylindrical platform. The collected oily water finally converges at the center of the platform, having little impact on the floating state of the cylindrical platform and eliminating the need for additional adjustment of the floating state of the cylindrical platform.

[0017] The deck opening forms of this application are flexible. Round holes and elliptical holes of different lengths can be arranged according to requirements such as the layout of main deck equipment, the path of personnel safety passage, the structural form under the main deck, and the convenience of operation and maintenance, reducing the design difficulty. Brief Description of the Drawings

[0018] Figure 1 It is the overall structural schematic diagram of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 2 It is the sectional schematic diagram of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 3 It is the sectional schematic diagram of the water passing hole reinforcement at location A of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 4 It is the sectional schematic diagram of the second flat iron support at location B of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 5 It is the sectional schematic diagram of the first flat iron support at location C of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 6 It is the structural schematic diagram of the third elliptical opening of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 7 It is the structural schematic diagram of the first elliptical opening of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 8 It is the structural schematic diagram of the fourth elliptical opening of the main deck oily water collection structure of the oil and gas platform of the present invention; Figure 9 It is the structural schematic diagram of the second elliptical opening of the main deck oily water collection structure of the oil and gas platform of the present invention.

[0019] Explanation of the marks in the figures: 1. First oily water collection module; 2. Second oily water collection module; 3. Grille; 4. Circular opening; 5. First elliptical opening; 6. Second elliptical opening; 7. Third elliptical opening; 8. Fourth elliptical opening; 9. Water passing hole reinforcement; 10. Outer ring bulkhead; 11. Middle ring bulkhead; 12. Inner ring bulkhead; 13. Radial bulkhead; 14. Oily water tank; 15. Main deck; 16. Second bottom plate; 17. Second side plate; 18. Main deck stiffener; 19. Main deck girder; 20. First flat iron support; 21. Second flat iron support; 22. Grille support; 23. Opening reinforcement flat iron; 24. Grille support angle steel; 25. Soft toe structure. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in 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. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means within the scope of the present invention and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0022] Next, refer to the attached Figure 1 to the attached Figure 9 to describe the main deck oily water collection structure of the oil and gas platform of the present invention.

[0023] As Figure 1 shown, the main deck oily water collection structure of the oil and gas platform in the present invention includes a first oily water collection module 1 and a second oily water collection module 2. Both the first oily water collection module 1 and the second oily water collection module 2 are arranged below the main deck 15. The first oily water collection module 1 is arranged circumferentially along the center of the main deck 15, and the second oily water collection module 2 is radially connected to the first oily water collection module 1 along the first oily water collection module 1. A plurality of deck openings corresponding to the first oily water collection module 1 and the second oily water collection module 2 are opened on the main deck 15, and a grille 3 is arranged on the deck openings. The upper surface of the grille 3 is in the same plane as the upper surface of the main deck 15, so that the oily water flows into the first oily water collection module 1 and the second oily water collection module 2 along the deck openings.

[0024] By setting up the first oily water collection module 1 and the second oily water collection module 2 to collect oily water, the collected oily water can flow to the oily water tank 14 by relying on its own gravity component, without arranging pump equipment, reducing the design difficulty. After the oily water is collected, it flows from the second oily water collection module 2 to the first oily water collection module 1, and from the first oily water collection module 1 to the oily water tank 14 at the center of the cylindrical platform. The collected oily water finally converges at the center of the platform, having little impact on the floating state of the cylindrical platform and eliminating the need for additional adjustment of the floating state of the cylindrical platform.

[0025] Moreover, the deck opening forms are flexible. Round holes and elliptical holes of different lengths can be arranged according to requirements such as the layout of main deck equipment, the path of personnel safety passage, the structural form under the main deck 15, and the convenience of operation and maintenance, reducing the design difficulty.

[0026] Furthermore, as Figure 1 and Figure 2 shown, a plurality of second oily water collection modules 2 are radially and spacedly connected to the first oily water collection module 1 along the first oily water collection module 1. One end of the second oily water collection module 2 far from the first oily water collection module 1 is connected to the outer ring bulkhead 10; an oily water tank 14 is connected to the first oily water collection module 1 to enable the oily water in the first oily water collection module 1 and the second oily water collection module 2 to flow into the oily water tank 14.

[0027] In this embodiment, preferably, the first oily water collection module 1 is circumferentially arranged along the center of the main deck 15 of the cylindrical offshore oil and gas platform below the main deck 15. A plurality of second oily water collection modules 2 are radially spaced along the first oily water collection module 1, and the included angle between adjacent second oily water collection modules 2 is 45 degrees; as a preferred embodiment, 8 second oily water collection modules 2 are arranged in a divergent manner below the main deck 15.

[0028] Preferably, an oily water tank 14 is connected to the first oily water collection module 1. The bottom plates of the first oily water collection module 1 and the second oily water collection module 2 are both provided with a certain slope, that is, one end of the second oily water collection module 2 close to the first oily water collection module 1 is lower than the side close to the outer ring bulkhead 10, so that the oily water flows along the second oily water collection module 2 into the first oily water collection module 1 and from the first oily water collection module 1 into the oily water tank 14, without arranging pump equipment, reducing the overall design difficulty.

[0029] Preferably, a part of the first oily water collection module 1 is arranged inside the central oily water tank 14, and a plurality of water passing hole strengthening members 9 are provided on the side plates of this part of the first oily water collection module 1 for the oily water to flow into the central oily water tank 14.

[0030] The first oily water collection module 1 and the second oily water collection module 2 pass through the middle ring bulkhead 11, the inner ring bulkhead 12 and the main deck girder 19 of the cylindrical platform, and water passing hole stiffeners 9 are provided. Preferably, the arrangements of multiple second oily water collection modules 2 are the same and the structures are similar, which is convenient for prefabrication and construction of sectional structures.

[0031] Furthermore, as Figures 1 to 5 shown, the first oily water collection module 1 includes a first bottom plate and a first side plate. The first side plate and the inner ring bulkhead 12 are connected to the first bottom plate. The first side plate, the first bottom plate, the inner ring bulkhead 12 and the main deck 15 are sequentially connected to form a first square-section steel bulkhead for collecting oily water; the second oily water collection module 2 includes a second bottom plate 16 and a second side plate 17. The second side plate 17 and the radial bulkhead 13 are connected to the second bottom plate 16. The second side plate 17, the second bottom plate 16, the radial bulkhead 13 and the main deck 15 are sequentially connected to form a second square-section steel bulkhead, and the second square-section steel bulkhead communicates with the first square-section steel bulkhead.

[0032] A first flat iron support 20 is connected to the second square-section steel bulkhead, and the first flat iron support 20 is fixedly connected to the second side plate 17 and the main deck 15; a second flat iron support 21 is connected to the second square-section steel bulkhead, and the second flat iron support 21 is fixedly connected to the second bottom plate 16, the second side plate 17, the radial bulkhead 13 and the main deck 15 respectively.

[0033] In this embodiment, the first oily water collection module 1 is composed of a first bottom plate and a first side plate. The first bottom plate and the first side plate are fixedly connected to the inner ring bulkhead 12 and the main deck 15 to form a first square-section steel bulkhead; preferably, the inside of the first square-section steel bulkhead is a circumferential oily water flow channel, and the first bottom plate is inclined along the direction of the oily water tank 14 so that the oily water flows into the oily water tank 14.

[0034] The second oily water collection module 2 is composed of a second bottom plate 16 and a second side plate 17. The second bottom plate 16 and the second side plate 17 are fixedly connected to the radial bulkhead 13 and the main deck 15 of the cylindrical platform to form a second square-section steel bulkhead. The inside of the second square-section steel bulkhead is a radial oily water flow channel, and the second bottom plate 16 is inclined towards the first square-section steel bulkhead so that the oily water flows into the first square-section steel bulkhead along the second square-section steel bulkhead.

[0035] Preferably, multiple groups of first flat iron supports 20 and second flat iron supports 21 are arranged outside the second bottom plate 16 and the second side plate 17. The first flat iron support 20 is fixedly connected to the second side plate 17 and the main deck 15, and the second flat iron support 21 is fixedly connected to the second bottom plate 16, the second side plate 17, the radial bulkhead 13 and the main deck 15 respectively, thereby strengthening the overall steel structure of the second square-section steel bulkhead.

[0036] As a preferred embodiment, the bottom plate and side plate thicknesses of the first oily water collection module 1 and the second oily water collection module 2 should not be less than the maximum value among the thicknesses of the adjacent main deck 15, radiation bulkhead 13, outer ring bulkhead 10, middle ring bulkhead 11, and inner ring bulkhead plate 12.

[0037] Preferably, the first flat iron support 20 is arranged at the disconnection of the main deck stiffener 18. At the same time, to avoid stress concentration, a soft toe structure 25 is provided at the end of the first flat iron support 20 inside the oily water collection structure, and a soft toe structure 25 is provided at the end of the second flat iron support 21 outside the oily water collection structure.

[0038] The layout spacing between the second flat iron support 21 outside the oily water collection structure and the first flat iron support 20 inside the oily water collection structure is consistent with that of the main deck stiffener 18; to avoid stress concentration, a soft toe structure 25 is provided at the bottom plate of the oily water collection structure for the water passing hole stiffener 9.

[0039] Furthermore, as Figures 6 to 9 shown, a plurality of through holes are spacedly opened at the main deck 15 position along the first square-section steel bulkhead, and a grille 3 is connected to each of the plurality of through holes so that the oily water flows into the first square-section steel bulkhead along the plurality of through holes; a circular opening 4 and an elliptical opening are opened at the main deck 15 position along the second square-section steel bulkhead, and a grille 3 is connected to both the circular opening 4 and the elliptical opening so that the oily water flows into the second square-section steel bulkhead along the circular opening 4 and the elliptical opening.

[0040] The elliptical opening includes a first elliptical opening 5, a second elliptical opening 6, a third elliptical opening 7, and a fourth elliptical opening 8. The first elliptical opening 5, the second elliptical opening 6, the third elliptical opening 7, and the fourth elliptical opening 8 have different sizes and are spacedly opened on the main deck 15 along the length direction of the second square-section steel bulkhead.

[0041] In this embodiment, the connection method between the anti-falling object grille 3 and the through holes, circular opening 4, and elliptical opening should adopt a detachable fixation. Preferably, the anti-falling object grille 3 can meet the load-bearing capacity of a 2.5t working trolley. Grille support angle steels 24 should be arranged in the long side direction of the opening on the deck, and the spacing of the grille support angle steels 24 should not be greater than 600mm.

[0042] Preferably, the anti-falling object grille 3 can use detachable fastener clamps and be respectively rooted and fixed on the grille support 22 and the grille support angle steel 24; the anti-falling object grille 3 should adopt a galvanizing process method to reduce the corrosion rate and improve the service life.

[0043] Among them, to ensure the load-bearing capacity of the anti-falling object grille 3, the selected specification of the grille support angle steel 24 should not be lower than L100x100x10, and the selected plate thickness specification of the grille support 22 should not be lower than 13mm.

[0044] According to the requirements of the equipment layout on the main deck 15, the personnel safety access path, the structural layout of the main deck 15, and the operation and maintenance of the cylindrical platform, circular openings 4, first elliptical opening 5, second elliptical opening 6, third elliptical opening 7, and fourth elliptical opening 8 are arranged, and the distance between the circular opening 4, the first elliptical opening 5, the second elliptical opening 6, the third elliptical opening 7, and the fourth elliptical opening 8 should be not less than 400 mm; according to the specific sizes of the circular opening 4, the first elliptical opening 5, the second elliptical opening 6, the third elliptical opening 7, and the fourth elliptical opening 8, the corresponding number of grid support angle steels 24 are arranged to ensure that the grid 3 can play the role of preventing falling objects.

[0045] Preferably, the diameter of the circular opening 4 is set to 600 mm, the size of the first elliptical opening 5 is set to 2000 mm x 600 mm, the size of the second elliptical opening 6 is set to 1000 mm x 600 mm, the size of the third elliptical opening 7 is set to 2500 mm x 600 mm, and the size of the fourth elliptical opening 8 is set to 1500 mm x 600 mm.

[0046] On both sides of the first elliptical opening 5, the second elliptical opening 6, the third elliptical opening 7, and the fourth elliptical opening 8, at a distance of 100 mm from the opening edge, opening reinforcement flat irons 23 are respectively arranged on the back of the main deck 15, and the opening reinforcement flat irons 23 are respectively connected and fixed to the second side plate 17, the radiation bulkhead 13, the inner ring bulkhead 12, and the main deck 15.

[0047] Preferably, the grid support 22 is of flat iron structure and is respectively welded and fixed to the opening reinforcement flat iron 23, the side plate, the radiation bulkhead 13, the outer ring bulkhead 10, the middle ring bulkhead 11, and the inner ring bulkhead 12.

[0048] As a preferred embodiment, the second bottom plate 16 is not horizontally arranged, and the slope of the second bottom plate 16 is set to 1:50. One end of the second oily water collection module 2 is located at the outer ring bulkhead 10 of the cylindrical platform, the depth of the second bottom plate 16 from the main deck 15 is 600 mm, and the other end of the second oily water collection module 2 is located at the inner ring bulkhead 12 of the cylindrical platform, where the depth of the second bottom plate 16 from the main deck 15 is 1100 mm.

[0049] The first bottom plate of the first oily water collection module 1 is not horizontal, and the collected oily water flows by gravity to the oily water tank 14 at the center of the cylindrical platform. The slope of the first bottom plate is set to 1:50. The depth of the first bottom plate of the first oily water collection module 1 from the main deck 15 at the rib position R0 is 1250 mm, and the depth of the first bottom plate of the first oily water collection module 1 from the main deck 15 at the rib position R0 - 800 mm is 1630 mm.

[0050] The total length of all the circular openings 4, the first elliptical opening 5, the second elliptical opening 6, the third elliptical opening 7, and the fourth elliptical opening 8 provided in the second oily water collection module 2 should be less than 0.5 times the length of the second oily water collection module 2. The total length of the multiple through holes provided in the first oily water collection module 1 should be less than 0.5 times the total length of the first oily water collection module 1 that encircles it. Preferably, the through holes in the first oily water collection module 1 can also be circular or elliptical according to actual needs.

[0051] As a preferred embodiment, the arrangement of the circular opening 4, the first elliptical opening 5, the second elliptical opening 6, the third elliptical opening 7, and the fourth elliptical opening 8 can be further optimized according to different design requirements, and the arrangement order can be adjusted. At the same time, the major axis value of the deck opening can be finely adjusted to meet the requirements of actual engineering projects.

[0052] Moreover, the connection methods of both the first oily water collection module 1 and the second oily water collection module 2 to the hull structure of the cylindrical platform are fixed by welding, and the requirements for the steel materials used are the same as those of the hull structure of the cylindrical platform.

[0053] Based on the oily water collection structure on the main deck of the oil and gas platform, the first oily water collection module 1 and the second oily water collection module 2 are set to collect oily water. The collected oily water can flow to the oily water tank 14 by relying on its own gravity component without the need to arrange pump equipment, reducing the design difficulty. After the oily water is collected, it flows from the second oily water collection module 2 to the first oily water collection module 1, and then from the first oily water collection module 1 to the oily water tank 14 at the center of the cylindrical platform. The collected oily water finally converges at the center of the platform, having little impact on the floating state of the cylindrical platform and eliminating the need for additional adjustment of the floating state of the cylindrical platform.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. The main deck oily water collection structure of an oil and gas platform, characterized in that It includes a first oily water collection module and a second oily water collection module, and both the first oily water collection module and the second oily water collection module are arranged below the main deck; The first oily water collection module is arranged circumferentially along the center of the main deck, and the second oily water collection module is radially connected to the first oily water collection module along the first oily water collection module; A plurality of deck openings corresponding to the first oily water collection module and the second oily water collection module are opened on the main deck. Gratings are arranged on the deck openings, and the upper surface of the gratings is in the same plane as the upper surface of the main deck, so that the oily water flows into the first oily water collection module and the second oily water collection module along the deck openings.

2. The main deck oily water collection structure of the oil and gas platform according to claim 1, characterized in that, A plurality of second oily water collection modules are radially and spacedly connected to the first oily water collection module along the first oily water collection module, and one end of the second oily water collection module far from the first oily water collection module is connected to the outer ring bulkhead.

3. The main deck oily water collection structure of the oil and gas platform according to claim 1, characterized in that, An oily water tank is connected to the first oily water collection module, so that the oily water in the first oily water collection module and the second oily water collection module flows into the oily water tank.

4. The main deck oily water collection structure of the oil and gas platform according to claim 1, characterized in that The first oily water collection module includes a first bottom plate and a first side plate. The first side plate and the inner ring bulkhead are connected to the first bottom plate. The first side plate, the first bottom plate, the inner ring bulkhead and the main deck are sequentially connected to form a first square-section steel bulkhead for collecting oily water.

5. The main deck oily water collection structure of the oil and gas platform according to claim 4, characterized in that, The second oily water collection module includes a second bottom plate and a second side plate. The second side plate and the radial bulkhead are connected to the second bottom plate. The second side plate, the second bottom plate, the radial bulkhead and the main deck are sequentially connected to form a second square-section steel bulkhead, and the second square-section steel bulkhead is communicated with the first square-section steel bulkhead.

6. The main deck oily water collection structure of the oil and gas platform according to claim 5, characterized in that, A first flat iron support is connected to the second square-section steel bulkhead, and the first flat iron support is fixedly connected to the second side plate and the main deck.

7. The main deck oily water collection structure of the oil and gas platform according to claim 5, characterized in that A second flat iron support is connected to the second square-section steel bulkhead, and the second flat iron support is fixedly connected to the second bottom plate, the second side plate, the radial bulkhead and the main deck respectively.

8. The main deck oily water collection structure of the oil and gas platform according to claim 4, characterized in that, A plurality of through holes are spacedly opened at the main deck position along the first square-section steel bulkhead, and gratings are connected to the plurality of through holes, so that the oily water flows into the first square-section steel bulkhead along the plurality of through holes.

9. The main deck oily water collection structure of the oil and gas platform according to claim 5, characterized in that A circular opening and an elliptical opening are opened at the main deck position along the second square-section steel bulkhead, and gratings are connected to the circular opening and the elliptical opening, so that the oily water flows into the second square-section steel bulkhead along the circular opening and the elliptical opening.

10. The main deck oily water collection structure of the oil and gas platform according to claim 9, characterized in that, The elliptical opening includes a first elliptical opening, a second elliptical opening, a third elliptical opening and a fourth elliptical opening. The first elliptical opening, the second elliptical opening, the third elliptical opening and the fourth elliptical opening have different sizes and are spacedly opened on the main deck along the length direction of the second square-section steel bulkhead.

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