Segmented construction method for multi-point mooring cylindrical floating oil production, storage and offloading device

Abstract

The invention discloses a multi-point mooring cylindrical floating production oil storage and offloading device segmented construction method, which belongs to the field of floating production oil storage and offloading device production, and comprises the following steps: S1, segmented planning of a multi-point mooring cylindrical floating production oil storage and offloading device; s2, building a circular floating platform and introducing the circular floating platform into water; s3, building and mounting a main deck; s4, a process deck is built and installed; s5, adjusting the load of the circular floating platform; s6, building and installing life and function modules; s7, a fireproof and explosion-proof wall is built on the process deck; s8, building and installing a production module; s9, a mooring system is installed on the main deck; and S10, a bulwark structure is installed on the main deck. The production process is reasonable in sectioning, life and function modules are divided into a living area module, a public catering entertainment fitness area module, an office area module and a helicopter platform module, production modules are divided into an oil-gas separation module, a compression system module, a water purification treatment module, a pipeline maintenance module and a combustion arm, and all the modules are manufactured firstly; and then the modules are assembled on the circular floating platform, so that the production efficiency is greatly improved, and compared with the prior art, the manufacturing construction period is three months earlier.

Description

Technical Field

[0001] The invention relates to the technical field of production of a floating production storage and offloading device, in particular to a method for constructing a multi-point moored cylindrical floating production storage and offloading device in sections. Background Art

[0002] With the country's growing energy demand and the development of marine resource exploration, oil extraction is moving towards the deep sea. In order to meet the challenges of deepwater oil and gas reservoir development, deepwater development mostly adopts the development model of floating production platforms. FPSO (Floating Production Storage & Offloading, usually translated literally as floating production storage and offloading device) is currently a common carrier and method for deepwater oil and gas development, usually including ship-type and cylinder-type.

[0003] The cylindrical floating production storage and offloading unit (FPSO) has a main hull diameter of up to 70 meters, a bottom diameter of up to 87.5 meters, a main deck diameter of up to 78 meters, a production deck diameter of up to 82.5 meters, a depth of up to 32 meters, a production deck height of up to 36.5 meters, a ballast draft of up to 16.53 meters, and a load draft of up to 22 meters, so it is very large and heavy. The cylindrical floating production storage and offloading unit is generally manufactured by segmented welding.

[0004] At present, the segmented manufacturing of cylindrical floating production storage and offloading (FPSO) units is not reasonable, which affects the production efficiency. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies, the object of the present invention is to provide a method for segmented construction of a multi-point moored cylindrical floating production storage and offloading device with reasonable segmentation and high production efficiency.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections, comprising the following steps: S1. Segment planning of multi-point moored cylindrical floating production storage and offloading unit: the multi-point moored cylindrical floating production storage and offloading unit is divided into a circular floating platform, a main deck, a process deck, a production module and a living and functional module; S2. Build a circular floating platform and introduce the circular floating platform into the water; S3. Build and install the main deck; S4. Build and install the craft deck; S5. Load adjustment of circular floating platform; S6. Build and install living and functional modules; S7. Construction of fire and explosion resistant walls on the process deck; S8. Build and install production modules; S9. Install mooring system on main deck; S10. Install bulwark structure on main deck.

[0007] Furthermore, in step S2, a circular floating platform is assembled and constructed in the onshore dock, and the height of the circular floating platform is not more than 24.1 meters; after the circular floating platform is built, a transverse slide rail is laid on the semi-submersible barge, and the semi-submersible barge is filled with water and ballasted to dive, and the circular floating platform is towed to the slide rail of the semi-submersible barge through a winch of more than 75 tons and a pulley group of more than 800 tons. The semi-submersible barge dives and transports the circular floating platform to the construction and installation wharf. After arriving at the designated location, the semi-submersible barge is filled with water and ballasted to dive, and the circular floating platform is pulled into the water by a tugboat.

[0008] Furthermore, in step S3, the structure of the main deck is divided into 25 sections, and the weight of each section is controlled within 150 tons. After the circular floating platform is berthed at the construction and installation dock, it is hoisted and closed using a gantry crane with a capacity of more than 200 tons at the dock.

[0009] Furthermore, in step S4, the process deck is divided into 12 sections. After each section is built, a frame structure is welded on each section. After each section is hoisted to a designated location using a gantry crane of more than 200 tons at the dock, the welded frame on each section is welded to the main deck, and adjacent sections are welded together.

[0010] Furthermore, in step S5, water is injected into the circular floating platform to adjust the load, so that the circular floating platform is ballasted and submerged.

[0011] Furthermore, in step S6, living and functional modules are constructed in the production plant, including a living area module, a public catering, entertainment and fitness area module, an office area module and a helicopter platform module, wherein the overall dimensions of the living area module are: 27 meters long, 11.245 meters wide, 21.5 meters high, and weighing 770 tons; the overall dimensions of the public catering, entertainment and fitness area module are: 20 meters long, 14 meters wide, 24.2 meters high, and weighing 658 tons; the overall dimensions of the office area module are: 19 meters long, 14 meters wide, 17.2 meters high, and weighing 495 tons; each module is moved along the slide rail to the construction and installation dock, and the 800-ton gantry crane of the dock is used to hoist the living area module, the public catering, entertainment and fitness area module, and the office area module to the designated positions on the process deck and then welded to the process deck, and the helicopter platform module is hoisted to the top side of the living area module and welded to the living area module; finally, the power module is hoisted, and the power module is a generator set.

[0012] Furthermore, in step S7, a fireproof and explosion-proof wall is constructed on the process deck, the fireproof and explosion-proof wall comprising a fireproof front wall steel frame, an explosion-proof middle wall steel plate and an explosion-proof rear wall steel frame. An explosion-proof rear wall steel frame is constructed on the process deck near the living and functional modules, the explosion-proof rear wall steel frame is first welded to the process deck, and a spray cooling system and a CO2 spray cooling system are arranged on the explosion-proof rear wall steel frame. 2 Spray fire extinguishing system; then install the explosion-proof middle wall steel plate on the process deck, and connect the explosion-proof middle wall steel plate with the explosion-proof rear wall steel frame; finally install the fire-proof front wall steel frame, and keep a certain buffer gap between the fire-proof front wall steel frame and the explosion-proof middle wall steel plate.

[0013] Furthermore, in step S8, a production module is constructed in the production plant, including an oil-gas separation module, a compression system module, a water purification module, a pipeline maintenance module and a combustion arm, wherein the length*width*height of the oil-gas separation module is 22x19x16m, and the weight is 760 tons; the length*width*height of the combustion arm is 18x8x10m, and the weight is 175 tons; each module is moved to the construction and installation dock along the slide rail, and the oil-gas separation module, the compression system module, the water purification module, and the pipeline maintenance module are hoisted to the designated positions on the process deck by the 800-ton gantry crane of the dock, and then welded to the process deck; finally, the combustion arm is hoisted, and the upper end of the combustion arm is tilted in the direction away from the circular floating platform.

[0014] Furthermore, in step S9, the mooring system is divided into three groups, each mooring system includes an anchor winch, a cable stopper, a cable guide wheel assembly, a mooring cable and a fixed anchor, the anchor winch and the cable stopper are located on the main deck of the circular floating platform, one end of the mooring cable is wound on the anchor winch, and the other end of the mooring cable passes through the cable guide wheel assembly and is connected to the fixed anchor, and the cable stopper is used to lock the mooring cable; the mooring cable adopts a polyester cable with a diameter of 240mm-280mm.

[0015] Furthermore, in step S10, an open frame structure capable of natural ventilation is installed on the periphery of the main deck, and a circle of wave breakers and drainage grooves are arranged on the main deck and along the inner side of the bulwark structure.

[0016] The beneficial effects of the present invention are: The production process of the present invention is reasonably segmented, dividing the living and functional modules into living area modules, public catering, entertainment and fitness area modules, office area modules and helicopter platform modules, and dividing the production modules into oil and gas separation modules, compression system modules, water purification and treatment modules, pipeline maintenance modules and combustion arms. Each module is manufactured first and then assembled on a circular floating platform, thereby greatly improving the production efficiency. Compared with the prior art, the production period is shortened by 3 months. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described with the aid of the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other accompanying drawings according to the following drawings without creative work: Figure 1 A flow chart of the method of constructing in sections for the present invention; Figure 2 It is a schematic diagram of the structure of the cylindrical hull in a multi-point moored cylindrical floating production storage and offloading unit; Figure 3 This is a state diagram of the circular floating platform being pulled into water according to the present invention; Figure 4 The structural schematic diagram of the process deck of the present invention after installation is completed; Figure 5 The structural diagram of the present invention after the life and function modules are installed Figure 6 The structural schematic diagram of the fireproof and explosion-proof wall of the present invention after installation is completed; Figure 7 The structural schematic diagram of the production module of the present invention after installation is completed; Figure 8 The schematic diagram of the structure after all the processes of the present invention are installed is shown.

[0018] In the figure: 1. Circular floating platform; 2. Semi-submersible barge; 3. Slide rail; 4. Tugboat; 5. Main deck; 6. Welded frame; 7. Process deck; 8. Living area module; 9. Public dining, entertainment and fitness area module; 10. Office area module; 11. Helicopter platform module; 12. Power module; 13. Fireproof front wall steel frame; 14. Explosion-proof middle wall steel plate; 15. Explosion-proof rear wall steel frame; 16. Spray cooling system; 17. CO 2 Jet fire extinguishing system; 18. Oil and gas separation module; 19. Compression system module; 20. Water purification module; 21. Pipeline maintenance module; 22. Burning arm; 23. Mooring system; 24. Mooring cable; 25. Bulwark structure; 26. Breakwater; 27. Drainage trough. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "forward", "reverse", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] like Figure 1 As shown, a method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections comprises the following steps: S1. Segment planning of multi-point moored cylindrical floating production storage and offloading unit: the multi-point moored cylindrical floating production storage and offloading unit is divided into a circular floating platform, a main deck, a process deck, a production module and a living and functional module; S2. Construction of a circular floating platform and the introduction of a circular floating platform into the water: A circular floating platform 1 is constructed in a land dock, the height of the circular floating platform is not greater than 24.1 meters, such as Figure 2 As shown; after the construction of the circular floating platform 1 is completed, a transverse slide rail 3 is laid on the semi-submersible barge 2, and the semi-submersible barge is filled with water and ballast to dive. The circular floating platform 1 is towed to the slide rail 3 of the semi-submersible barge 2 through a winch of more than 75 tons and a pulley block of more than 800 tons. The semi-submersible barge dives and transports the circular floating platform to the construction and installation dock. After arriving at the designated location, the semi-submersible barge is filled with water and ballast to dive, and the circular floating platform 1 is pulled into the water by a tugboat 4, as shown in FIG. Figure 3 shown.

[0022] S3. Construction and installation of the main deck: The structure of the main deck is divided into 25 sections, and the weight of each section is controlled within 150 tons. After the circular pontoon is berthed at the construction and installation dock, it is hoisted and closed using a gantry crane with a capacity of more than 200 tons at the dock.

[0023] S4. Construction and installation of process deck: Divide the process deck 7 into 12 sections. After each section is built, weld the frame structure on each section. Use the gantry crane with a capacity of more than 200 tons to lift each section to the designated position. Then weld the welded frame 6 on each section to the main deck 5. Weld the adjacent sections together. Figure 4 shown.

[0024] S5. Load adjustment of circular floating platform: Fill the circular floating platform with water to adjust its load so that the circular floating platform can be ballasted and submerged.

[0025] S6. Build and install living and functional modules: Build living and functional modules in the production plant, including living area modules, public catering, entertainment and fitness area modules, office area modules and helicopter platform modules, among which the overall dimensions of the living area module are: 27 meters long, 11.245 meters wide, 21.5 meters high, and weigh 770 tons; the overall dimensions of the public catering, entertainment and fitness area modules are: 20 meters long, 14 meters wide, 24.2 meters high, and weigh 658 tons; the overall dimensions of the office area module are: 19 meters long, 14 meters wide, 17.2 meters high, and weigh 495 tons; move each module along the slide rail to the construction and installation dock, use the 800-ton gantry crane of the dock to hoist the living area module 8, the public catering, entertainment and fitness area module 9, and the office area module 10 to the designated positions on the process deck 7, and then weld them to the process deck 7, hoist the helicopter platform module 11 to the top side of the living area module 8 and weld it to the living area module 8; finally hoist the power module 12, which is a generator set. After installation, Figure 5 shown.

[0026] S7. Build a fireproof and explosion-proof wall on the process deck: Build a fireproof and explosion-proof wall on the process deck, the fireproof and explosion-proof wall includes a fireproof front wall steel frame 13, an explosion-proof middle wall steel plate 14 and an explosion-proof rear wall steel frame 15. Build an explosion-proof rear wall steel frame on the process deck near the living and functional modules, first weld the explosion-proof rear wall steel frame to the process deck, and arrange a spray cooling system 16 and a CO2 spray cooling system on the explosion-proof rear wall steel frame. 2 Spray fire extinguishing system 17; then install the explosion-proof middle wall steel plate on the process deck, and connect the explosion-proof middle wall steel plate with the explosion-proof rear wall steel frame; finally install the fire-proof front wall steel frame, and keep a certain buffer gap between the fire-proof front wall steel frame and the explosion-proof middle wall steel plate, such as Figure 6 In this application, a fireproof and explosion-proof wall is added to the circular floating platform. When a fire occurs in the production module, all staff members pass through the fireproof and explosion-proof wall to enter the safe area of ​​the living and functional modules. The fire protection system in the production module is activated to automatically put out the fire. If the fire cannot be extinguished and the production module further causes an explosion, the personnel in the safe area of ​​the living and functional modules enter the helicopter platform module and evacuate in an orderly manner to maximize the personal safety of the staff on the circular floating platform.

[0027] S8. Build and install production modules: Build production modules in the production plant, including oil and gas separation module 18, compression system module 19, water purification module 20, pipeline maintenance module 21 and combustion arm 22, move each module along the slide rail to the construction and installation dock, use the 800-ton gantry crane of the dock to hoist the oil and gas separation module, compression system module, water purification module and pipeline maintenance module to the designated position on the process deck, and weld them to the process deck, finally hoist the combustion arm and tilt the upper end of the combustion arm away from the circular floating platform, such as Figure 7 shown.

[0028] S9. Install the mooring system on the main deck: the mooring system 23 is divided into three groups, each mooring system 23 includes an anchor winch, a cable stopper, a cable guide wheel assembly, a mooring cable and a fixed anchor. The anchor winch and the cable stopper are located on the main deck of the circular floating platform. One end of the mooring cable is wound around the anchor winch, and the other end of the mooring cable passes through the cable guide wheel assembly and is connected to the fixed anchor. The cable stopper is used to lock the mooring cable; the mooring cable 24 is a polyester cable with a diameter of 240mm-280mm.

[0029] S10. Installing a bulwark structure 25 on the main deck: An open frame bulwark structure 25 capable of natural ventilation is installed on the periphery of the main deck, and a circle of wave breakers 26 and drainage grooves 27 are arranged on the main deck and along the inner side of the bulwark structure 25, such as Figure 8 shown.

[0030] Working principle: The present invention has reasonable segmentation, dividing the living and functional modules into living area modules, public catering, entertainment and fitness area modules, office area modules and helicopter platform modules, and dividing the production modules into oil and gas separation modules, compression system modules, water purification modules, pipeline maintenance modules and combustion arms. Each module is manufactured first and then assembled on a circular floating platform, thereby greatly improving the production efficiency. Compared with the prior art, the production period is shortened by 3 months.

[0031] In addition, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradiction. Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections, characterized in that: The following steps are involved: S1. Segment planning of multi-point moored cylindrical floating production storage and offloading unit: the multi-point moored cylindrical floating production storage and offloading unit is divided into a circular floating platform, a main deck, a process deck, a production module and a living and functional module; S2. Build a circular floating platform and introduce the circular floating platform into the water; S3. Build and install the main deck; S4. Build and install craft deck; S5. Load adjustment of circular floating platform; S6. Build and install living and functional modules; S7. Construction of fire and explosion resistant walls on the process deck; S8. Build and install production modules; S9. Install mooring system on main deck; S10. Install bulwark structure on main deck.

2. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S2, a circular floating platform is assembled and built in the onshore dock, and the height of the circular floating platform is not more than 24.1 meters. After the circular floating platform is built, a transverse slide rail is laid on the semi-submersible barge, and the semi-submersible barge is filled with water and ballasted to dive. The circular floating platform is towed to the slide rail of the semi-submersible barge through a winch of more than 75 tons and a pulley block of more than 800 tons. The semi-submersible barge dives and transports the circular floating platform to the construction and installation wharf. After arriving at the designated location, the semi-submersible barge is filled with water and ballasted to dive, and the circular floating platform is pulled into the water by a tugboat.

3. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S3, the structure of the main deck is divided into 25 sections, and the weight of each section is controlled within 150 tons. After the circular floating platform is berthed at the construction and installation dock, it is hoisted and closed using a gantry crane with a capacity of more than 200 tons at the dock.

4. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S4, the process deck is divided into 12 sections. After each section is built, a frame structure is welded on each section. After each section is hoisted to a designated location using a gantry crane of more than 200 tons at the dock, the welded frame on each section is welded to the main deck, and adjacent sections are welded together.

5. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S5, water is injected into the circular floating platform to adjust the load, so that the circular floating platform is ballasted and submerged.

6. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S6, living and functional modules are built in the production plant, including a living area module, a public catering, entertainment and fitness area module, an office area module and a helicopter platform module, wherein the overall dimensions of the living area module are: 27 meters long, 11.245 meters wide, 21.5 meters high, and weighing 770 tons; the overall dimensions of the public catering, entertainment and fitness area module are: 20 meters long, 14 meters wide, 24.2 meters high, and weighing 658 tons; the overall dimensions of the office area module are: 19 meters long, 14 meters wide, 17.2 meters high, and weighing 495 tons; each module is moved along the slide rail to the construction and installation dock, and the 800-ton gantry crane of the dock is used to hoist the living area module, the public catering, entertainment and fitness area module, and the office area module to the designated positions on the process deck and then welded to the process deck, and the helicopter platform module is hoisted to the top side of the living area module and welded to the living area module; finally, the power module is hoisted, and the power module is a generator set.

7. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S7, a fireproof and explosion-proof wall is constructed on the process deck, wherein the fireproof and explosion-proof wall comprises a fireproof front wall steel frame, an explosion-proof middle wall steel plate and an explosion-proof rear wall steel frame. The explosion-proof rear wall steel frame is constructed on the process deck near the living and functional modules. The explosion-proof rear wall steel frame is first welded to the process deck, and a spray cooling system and a CO2 jet fire extinguishing system are arranged on the explosion-proof rear wall steel frame; then, the explosion-proof middle wall steel plate is installed on the process deck, and the explosion-proof middle wall steel plate is connected to the explosion-proof rear wall steel frame; finally, the fireproof front wall steel frame is installed, and a certain buffer gap is reserved between the fireproof front wall steel frame and the explosion-proof middle wall steel plate.

8. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S8, a production module is constructed in the production plant, including an oil-gas separation module, a compression system module, a water purification module, a pipeline maintenance module and a combustion arm. Each module is moved along a slide rail to the construction and installation dock. The 800-ton gantry crane at the dock is used to hoist the oil-gas separation module, the compression system module, the water purification module and the pipeline maintenance module to designated positions on the process deck and then welded to the process deck. Finally, the combustion arm is hoisted and the upper end of the combustion arm is tilted away from the circular floating platform.

9. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S9, the mooring system is divided into three groups, each mooring system includes an anchor winch, a cable stopper, a cable guide wheel assembly, a mooring cable and a fixed anchor. The anchor winch and the cable stopper are located on the main deck of the circular floating platform. One end of the mooring cable is wound on the anchor winch, and the other end of the mooring cable passes through the cable guide wheel assembly and is connected to the fixed anchor. The cable stopper is used to lock the mooring cable; the mooring cable adopts a polyester cable with a diameter of 240mm-280mm.

10. The method for constructing a multi-point moored cylindrical floating production storage and offloading unit in sections according to claim 1, characterized in that: In step S10, an open frame structure capable of natural ventilation is installed on the periphery of the main deck, and a circle of wave breakers and drainage grooves are arranged on the main deck and along the inner side of the bulwark structure.

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