Modular system for underwater exploitation and underwater storage of offshore oil and gas

Abstract

The utility model discloses a modularized system for underwater exploitation and underwater storage of offshore oil and gas, belongs to the technical field of offshore oil and gas storage and output, and aims to solve the problem of high construction cost of an existing offshore oil storage and drainage device. The modularized system for underwater exploitation and underwater storage of the offshore oil and gas comprises an underwater exploitation module and an underwater storage module, the underwater storage module comprises an outer frame (1) and an oil storage bag (3), the outer frame (1) comprises a frame body (11) and a containing space (12), and the oil storage bag (3) is fixed in the containing space (12). The underwater storage module is built underwater, the cost of the outer frame and the oil storage bag is relatively low, meanwhile, safe storage and output of crude oil can be achieved, the oil field development problem is solved, the benefits of oil field development are guaranteed, and safe and efficient development of offshore oil is achieved.

Description

Technical Field

[0001] This utility model relates to the field of marine oil and gas storage and export technology, specifically a modular system for underwater extraction and storage of marine oil and gas. Background Technology

[0002] In offshore oilfield development, crude oil storage and transportation are crucial aspects. Conventional storage and transportation models include: 1. Well fluids produced by the jacket wellhead platform are transported via subsea mixed-transport pipelines to a central production processing platform for processing. The refined oil is then transported to onshore terminals via subsea oil and gas pipelines. 2. Well fluids produced by the jacket wellhead platform are transported via subsea mixed-transport pipelines to a floating production storage and offloading (FPSO) unit for processing. The refined oil is stored on the FPSO and periodically unloaded by shuttle tankers for transport to ports. Conventional development models involve large initial investments, long construction periods, and high operation and maintenance costs, resulting in poor economic viability. This is particularly true for small near-shore oilfields and marginal offshore oilfields, where the economic performance is extremely poor, making profitability difficult. Utility Model Content

[0003] To address the high construction costs of existing offshore oil storage and drainage devices, this invention provides a modular system for underwater oil and gas extraction and storage. The multi-cavity combined underwater oil storage bladder device within this modular system is constructed underwater, with relatively low costs for the outer frame and storage bladder. Simultaneously, it enables the safe storage and transportation of crude oil, thereby solving oilfield development challenges, reducing economic losses, ensuring the efficiency of oilfield development, minimizing operational risks, and achieving safe and efficient offshore oil development.

[0004] The technical solution adopted by this utility model embodiment to solve its technical problem is:

[0005] A modular system for subsea oil and gas extraction and storage includes a subsea extraction module and a subsea storage module. The subsea extraction module contains a subsea wellhead device and a subsea separation device. The subsea storage module contains a multi-cavity combined subsea oil storage bladder device, which includes an outer frame and an oil storage bladder. The outer frame includes a frame and a receiving space. The oil storage bladder is fixed in the receiving space and contains multiple independent chambers arranged in a left-right direction. Adjacent chambers are separated by partitions. The subsea wellhead device, the subsea separation device, and the oil storage bladder are connected in sequence.

[0006] The frame consists of an upper frame, support columns, and a lower frame connected from top to bottom. The space is cut into a trapezoidal cross-section by a vertical section extending in the front-back direction, with the top of the trapezoid facing upwards and the bottom facing downwards. The lower frame can be connected and fixed to the seabed by a suction anchor.

[0007] The frame is a steel pipe concrete structure. The upper frame contains multiple upper crossbeams, which are spaced apart in the front-to-back direction and extend in the left-to-right direction. The support columns are located around the frame, and the oil storage bladder has a cubic structure.

[0008] Multiple fixed flanges are fixed on the upper crossbeam, and the multiple fixed flanges are arranged at intervals in the left and right direction. Multiple flange seats are fixed on the upper surface of the oil reservoir, and the flange seats are connected and fixed to the fixed flanges. The upper crossbeam can bear the weight of the oil reservoir.

[0009] The front, rear, left and right sides of the oil reservoir are all fixedly connected with fixed lifting rings. The fixed lifting rings are connected to the upper frame through fixed chains, which can restrict the horizontal movement of the oil reservoir relative to the frame.

[0010] The oil reservoir contains a shell, and the multiple independent chambers are located within the shell. The shell is made of a flexible material and contains an oil-resistant layer, a pressure-resistant layer, and a corrosion-resistant layer stacked sequentially from the inside out. The oil-resistant layer is made of fluororubber, the pressure-resistant layer is made of aramid fiber composite material, and the corrosion-resistant layer is made of chlorosulfonated polyethylene rubber.

[0011] The oil reservoir is connected to multiple oil inlets and multiple oil outlets, and each oil inlet and outlet is connected to a corresponding chamber. Each oil inlet is connected to a control valve.

[0012] The underwater wellhead device is connected to the underwater separation device via the first delivery pipeline, and the underwater separation device is connected to the inlet end of each control valve via the second delivery pipeline.

[0013] The modular system for underwater oil and gas extraction and storage also includes an export module, which contains a buoy, a third delivery pipeline, and an export tanker. The buoy is able to float on the sea surface and is located above the outer frame. The inlet end of the third delivery pipeline is connected to the oil outlet in a one-to-one correspondence. The oil outlet is located at the upper end of the oil storage bladder. The outlet end of the third delivery pipeline is connected to the buoy. The buoy is connected to the outer frame by an anchor chain.

[0014] The beneficial effects of this utility model embodiment are:

[0015] 1. Modularize the entire process of marine oil and gas subsea extraction, subsea storage and export, realize the process of crude oil extraction, storage and export, and avoid the use of conventional methods such as building new production and processing platforms or using FPSO for crude oil storage operations, so as to realize the subsea storage and export of extracted crude oil.

[0016] 2. A multi-chamber combined underwater oil storage bladder device is adopted to store crude oil on the seabed. The seabed environment is relatively stable, which can avoid the harsh sea conditions on the surface and maintain the continuous crude oil extraction and storage operations under strong wind, wave and sea ice conditions.

[0017] 3. The multi-chamber combined underwater oil storage bladder device contains multiple independent multi-chamber structures. When one of the sub-chambers is damaged, the other undamaged sub-chambers can be used to continue the crude oil storage operation. At the same time, the oil inlet flow rate of the oil storage bladder can be controlled by the control valve, which can effectively reduce the environmental pollution and economic losses caused by the underwater oil storage bladder rupture and leakage, making the process of underwater oil and gas extraction, storage and transportation in the ocean safer and more efficient.

[0018] 4. The multi-chamber combined underwater oil storage bladder device has good compatibility, and multiple oil storage bladders can be connected to increase the storage capacity, making it safer and more convenient. Each oil storage bladder is also equipped with an individual frame, ensuring that each device can operate independently or in conjunction with others. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0020] Figure 1 This is a front view schematic diagram of the modular system for underwater extraction and storage of marine oil and gas as described in this utility model.

[0021] Figure 2 This is a right-side view of the multi-cavity combined underwater oil storage bladder device of this utility model.

[0022] Figure 3 This is a schematic diagram of an outer frame structure.

[0023] Figure 4 This is a schematic diagram showing the left sac chamber as full.

[0024] Figure 5 This is a schematic diagram showing the left and middle sac chambers in a full state.

[0025] Figure 6 This is a schematic diagram showing that the left, middle, and right sac chambers are all full.

[0026] Figure 7 This is a schematic diagram of the multi-cavity combined underwater oil storage bladder device of this utility model installed in nearshore waters.

[0027] Figure 8 This is a schematic diagram of the working state of the multi-cavity combined underwater oil storage bladder device of this utility model in nearshore waters.

[0028] Figure 9 This is a schematic diagram of the modular system combination and connection for the marine oil and gas subsea extraction and subsea storage.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Outer frame; 2. Suction anchor; 3. Oil reservoir; 4. Subsea wellhead device; 5. Subsea separation device; 6. Buoy; 7. Oil tanker; 8. Seabed;

[0031] 11. Frame; 12. Accommodation space; 13. Fixing flange;

[0032] 21. Drainage hole;

[0033] 31. Chamber; 32. Divider; 33. Flange seat; 34. Fixing ring; 35. Fixing chain; 36. Oil inlet; 37. Oil outlet; 38. Control valve;

[0034] 41. First delivery pipeline;

[0035] 51. Second delivery pipeline;

[0036] 61. Anchor chain; 62. Third delivery pipeline;

[0037] 111. Upper frame; 112. Supporting column; 113. Lower frame; 114. Upper beam; 115. Lower beam;

[0038] 311. Left sac chamber; 312. Middle sac chamber; 313. Right sac chamber. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The lower side of the middle, the directional word "left" indicates Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 1 The direction of the paper and pointing inwards from the paper; the directional word "back" indicates perpendicular to the paper. Figure 1The orientation of the paper is pointed outwards from the paper surface. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the dimensions and angles of the components, those skilled in the art can determine them specifically based on actual needs or a limited number of experiments.

[0041] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, a modular system for underwater oil and gas extraction and storage includes an underwater extraction module and an underwater storage module. The underwater extraction module includes an underwater wellhead device 4 and an underwater separation device 5. The underwater storage module includes a multi-cavity combined underwater oil storage bladder device, which includes an outer frame 1 and an oil storage bladder 3. The outer frame 1 includes an external frame 11 and an internal receiving space 12. The oil storage bladder 3 is fixed in the receiving space 12. The oil storage bladder 3 contains multiple independent chambers 31. The multiple chambers 31 are not interconnected and are arranged in a left-right direction. Adjacent chambers 31 are separated by a partition 32.

[0042] like Figures 1 to 3 As shown, the frame 11 includes an upper frame 111, a support column 112, and a lower frame 113 connected sequentially from top to bottom. The accommodating space 12 is cut into a trapezoidal cross-section by a vertical section extending in the front-back direction, preferably an isosceles trapezoid. The top of the trapezoid faces upward and the bottom faces downward. The lower frame 113 can be connected and fixed to the seabed 8 by suction anchors 2. The suction anchors 2 are located at the front and rear of the accommodating space 12, for example, suction anchors 2 are provided at both the front and rear of the accommodating space 12.

[0043] in, Figure 1 The diagram shows the main view of the multi-cavity combined underwater oil storage bladder device. Figure 2 The right view of the multi-cavity combined underwater oil storage bladder device shown.

[0044] The frame 11 is a steel-concrete composite frame structure, which improves strength and rigidity and facilitates the installation of the suction anchor 2. The upper frame 111 has a rectangular structure and contains multiple upper crossbeams 114, which can be steel-concrete composite beams. The multiple upper crossbeams 114 are spaced apart in the front-to-back direction and extend in the left-to-right direction. The support columns 112 are located around the frame 11, and the oil reservoir 3 has a cubic structure.

[0045] like Figures 1 to 3As shown, multiple fixed flanges 13 are fixed on the upper crossbeam 114, and the multiple fixed flanges 13 are arranged at intervals in the left-right direction. Multiple flange seats 33 are fixed on the upper surface of the oil reservoir 3, and the flange seats 33 are connected and fixed to the fixed flanges 13 in a one-to-one correspondence, thereby confining the oil reservoir 3 within the accommodating space 12 of the outer frame 1. The upper crossbeam 114 can bear the weight of the oil reservoir 3, and the weight of the oil reservoir 3 and the crude oil stored inside it is transferred to the upper crossbeam 114 in sequence through the flange seats 33 and the fixed flanges 13.

[0046] The support columns 112 are inclined and can be steel-concrete composite columns. The upper ends of the four support columns 112 are connected and fixed to the four corners of the upper frame 111 in a corresponding manner. The lower frame 113 is roughly rectangular in shape and contains multiple lower crossbeams 115. The lower crossbeams 115 can be steel-concrete composite beams. The multiple lower crossbeams 115 are spaced apart in the left-right direction and extend in the front-back direction.

[0047] Along the vertical direction, the front, rear, left and right sides of the oil storage bladder 3 are all fixedly connected to the middle of the outer side of the bladder. The fixed lifting rings 34 are connected to the upper frame 111 or the support column 112 through the fixed chains 35. The fixed chains 35 can restrict the oil storage bladder 3 from moving horizontally relative to the frame 11, ensuring that when the oil storage bladder 3 is fully loaded, there is a gap between the bottom of the bladder and the seabed sediment, thus avoiding wear on the bladder.

[0048] The oil reservoir 3 contains a shell (or may also be called a body), a partition 32 and the plurality of independent chambers 31 are all located inside the shell, the shell is made of a flexible material, and the shell contains an oil-resistant layer, a pressure-resistant layer and a corrosion-resistant layer stacked from the inside to the outside.

[0049] The oil-resistant layer is made of fluororubber (FKM), which exhibits excellent resistance to the complex composition of crude oil. Its advantages include superior chemical resistance and high-temperature resistance, as well as strong resistance to crude oil, its complex additives, and corrosive substances. Under harsh environments with high temperature and pressure, and crude oil containing complex and corrosive substances, it can strongly resist crude oil erosion and temperature shocks, ensuring oil storage safety and the lifespan of the storage tank. This makes it particularly advantageous in oil storage facilities operating under the demanding conditions of large offshore oil fields.

[0050] The pressure-resistant layer is made of aramid fiber composite material, which has high strength, light weight, high modulus, and excellent fatigue and impact resistance. Its advantages include: significantly enhancing the pressure resistance of the oil reservoir; its excellent fatigue and impact resistance; and its reliable maintenance of reservoir stability in the complex marine environment of deep sea under high pressure and frequent external impacts, thus building a crucial defense line for oil storage safety. It is indispensable in oil storage facilities in deep-sea oil fields or areas with harsh sea conditions, effectively reducing the risk of oil reservoir failure due to environmental factors and extending maintenance cycles.

[0051] The corrosion-resistant layer is made of chlorosulfonated polyethylene rubber (CSM), which contains chlorine and sulfonyl chloride groups in its molecules, exhibiting excellent corrosion resistance and aging resistance. Its advantages include: comprehensive resistance to seawater salinity, microorganisms, and atmospheric corrosive media in marine environments; stable corrosion resistance during long-term use of the oil reservoir; and durable shell protection. It is widely used in near-shore or shallow-sea oil reservoirs, is economical and practical, and can significantly extend the service life of the oil reservoir at a reasonable cost, reducing maintenance costs and replacement frequency.

[0052] Preferably, the oil storage bladder 3 contains three chambers 31, which are designated as a left chamber 311, a middle chamber 312, and a right chamber 313, respectively. The three chambers 31 are used to store crude oil from the branch pipeline, and each chamber is independent and does not interfere with the others. The three chambers 31 are used in conjunction with the control valve 38 described below to ensure that oil storage and transportation operations continue even if a leak occurs in one of the chambers, such as... Figures 4 to 6 As shown.

[0053] The oil reservoir 3 is connected to multiple oil inlets 36 and multiple oil outlets 37. Each oil inlet 36 and oil outlet 37 is connected to a corresponding chamber 31. That is, each chamber 31 is connected to its own independent oil inlet 36 and oil outlet 37. The oil inlet and outlet of each chamber 31 do not affect each other. Each oil inlet 36 is connected to a control valve 38. That is, each control valve 38 corresponds to a chamber 31. The oil can be distributed through the control valve 38.

[0054] The lower end face of the oil reservoir 3 is higher than the lower end face of the outer frame 1, and there is a gap between the lower end face of the oil reservoir 3 and the surface of the seabed 8. The subsea wellhead device 4 is connected to the subsea separation device 5 through the first delivery pipeline 41, and the subsea separation device 5 is connected to the inlet end of each control valve 38 through the second delivery pipeline 51.

[0055] The subsea extraction module extracts crude oil from the bottom of the well to the wellhead and performs oil (or gas)-water separation to obtain high-purity crude oil (natural gas). It consists of a subsea wellhead device 4 and a subsea separation device 5. The subsea wellhead device 4 is used to control and regulate the production of the oil well and transports the reservoir fluid to the subsea separation device 5 through the first delivery pipeline 41. The subsea separation device 5 receives the mixed fluid from the subsea pipeline and performs oil (or gas)-water separation processing to obtain high-purity crude oil.

[0056] Specifically, both the subsea wellhead device 4 and the subsea separation device 5 can employ existing technologies. The subsea wellhead device 4 mainly includes a Christmas tree and a subsea manifold. The first delivery pipeline 41 of the subsea manifold is connected to the subsea separation device 5. The subsea wellhead device 4 and the first delivery pipeline 41 transport the extracted oil and gas to the subsea separation device 5. The subsea separation device 5 can separate the extracted oil and gas resources. The separated crude oil or natural gas can be transported to the storage tank 3 for storage via the second delivery pipeline 51.

[0057] like Figures 1 to 2 As shown, the modular system for underwater oil and gas extraction and storage also includes an export module. This export module comprises a buoy 6, a third delivery pipeline 62, and an export tanker 7. The buoy 6 floats on the sea surface and is located above the outer frame 1. Multiple third delivery pipelines 62 are included, with their inlets connected to oil outlets 37 one-to-one and their outlets connected to the buoy 6. The buoy 6 is connected to the upper part of the outer frame 1 via anchor chains 61 and is moored on the sea surface. The export tanker 7 extracts crude oil (or natural gas) from the underwater storage tank via the third delivery pipeline 62 and transports it back to land.

[0058] The oil outlet 37 is located at the upper end of the oil reservoir 3. The oil outlets 37 of the left chamber 311, the middle chamber 312, and the right chamber 313 are all located at the upper end. Based on the principle of oil-water density difference, an oil-water interface is formed after the oil and water have been left to stand for a long time, and the oil will float on the water. The oil is then transported out through the oil outlet connected to the oil pipe, which can reduce the water content of the transported oil.

[0059] The advantages of this invention are: it modularizes the entire process of underwater oil and gas extraction, storage, and transportation, and introduces an underwater oil storage method. The basic principle of this method is to utilize the flexibility of underwater oil storage tanks to achieve rapid and efficient extraction and storage of seabed oil and gas in complex underwater geological environments. Compared with traditional oil and gas storage methods, this method has advantages such as small size, light weight, and simple structure, better adapting to the needs of underwater oil production operations, reducing production costs, ensuring the efficiency of oilfield development, reducing development risks, and achieving efficient development of offshore oilfields.

[0060] The following describes the construction method of the modular system for subsea oil and gas extraction and storage, which includes the following steps:

[0061] Install underwater wellhead device 4 and underwater separation device 5;

[0062] Measure the direction of ocean currents at seabed 8, for example, the direction of the current is direction A or direction B, such as... Figure 2 As shown;

[0063] The connected outer frame 1 and oil storage tank 3 are hoisted as a whole and lowered into the seabed 8 by their own weight. The multi-cavity combined underwater oil storage tank device is installed on the seabed 8. During installation, the front or rear side of the outer frame 1 is made to face the ocean current direction A or B. The outer frame 1 is connected and fixed to the seabed 8 using a suction anchor 2. The front or rear side of the outer frame 1 facing the ocean current direction A or B can avoid vortex-induced vibration fatigue damage. The cross-section of the accommodating space 12 after being cut by a vertical section extending in the front-rear direction is trapezoidal, which not only ensures the stability of the frame on the bottom, but also facilitates the connection of the fixing flange.

[0064] The specific installation method of the suction anchor 2 is as follows: seawater is pumped out of the anchor tube of the suction anchor 2 through the pumping hole 21, creating a low pressure inside the anchor tube. The high-pressure seawater is then used to insert the suction anchor 2 into the seabed soil, thereby fixing the outer frame 1. After the outer frame 1 is fixed, the subsea wellhead device 4, the subsea separation device 5, and the oil storage tank 3 are connected in sequence. The subsea wellhead device 4 is connected to the subsea separation device 5 through the first delivery pipeline 41, and the subsea separation device 5 is connected to each control valve 38 of the oil storage tank 3 through the second delivery pipeline 51. Oil storage operations can only be carried out when the pipelines of the subsea oil production equipment are connected to the delivery pipelines, that is, when the oil delivery pipeline is connected to the oil storage tank 3.

[0065] In operation, crude oil is supplied to the desired oil storage bladder 3 chamber 31 through the second delivery pipeline 51 and control valve 38, increasing the volume of the oil storage bladder 3 and storing the crude oil. When the underwater oil storage bladder 3 reaches full capacity, the control valve 38 is closed to prevent further oil intake and leakage at the inlet 36. Furthermore, in the event of partial damage to the bladder, simply adjusting the control valve 38 to stop the injection of oil and gas into the damaged chamber allows oil storage operations to continue through the other chambers.

[0066] During the export operation phase, the relevant equipment on the export tanker 7 is connected to the outlet end of the third transmission pipeline 62, which is connected to the chamber 31 of the required oil storage sac 3, to output the crude oil in the chamber 31 of the required oil storage sac 3 to the export tanker 7, and then the export tanker 7 completes the transportation of marine oil and gas resources.

[0067] When in use, during oil storage operations, the oil flow rate of the oil production equipment can be distributed by controlling the control valve 38 on the second delivery pipeline 51. The flow rate can be distributed to the three chambers: the left chamber 311, the middle chamber 312, and the right chamber 313.

[0068] When the oil storage reaches the condition for external transportation, the external transportation tanker 7 approaches the vicinity of the float 6 and connects to the third transportation pipeline 62 corresponding to the pre-transported oil chamber. This allows the oil stored in the chamber to be transported to the external transportation tanker 7 for external transportation. If partial damage to the chamber occurs, and leakage is detected in one or two of the left chamber 311, middle chamber 312, and right chamber 313, the control valve 38 corresponding to the leaking chamber can be controlled to continue oil storage operations using the other two or one chamber without stopping oil production. Remote control and monitoring of the operation process improves the safety and reliability of oil production and enhances the working conditions for personnel.

[0069] The modular system for subsea oil and gas extraction and storage is applicable not only to offshore areas but also to nearshore areas, such as... Figure 7 and Figure 8 As shown. Of course, for nearshore oil fields, the export module can be optimized. Under nearshore conditions, the third export pipeline 62 can be directly connected to the onshore equipment to avoid the use of the buoy 6, the mooring chain 61, and the export tanker 7, thereby further saving on extraction costs.

[0070] Of course, for shallow water oilfields, the suction anchor 2 fixing method can be adjusted to a pile-type fixing. Under this condition, the corresponding external transportation mode can also be optimized. The connection between the underwater storage module and the underwater mining module can be disconnected by underwater divers, and the pile can be pulled out by a crane. The underwater oil storage tank 3 can be directly hoisted onto the tugboat to achieve the transportation purpose. This method simplifies the equipment involved in the external transportation module and the connection between the modules, and can effectively improve the operation efficiency.

[0071] When conducting high-production subsea oil storage in oilfields, multiple modular systems for offshore oil and gas subsea extraction and storage can be installed. By connecting the oil production equipment to the inlet connection end of their respective second delivery pipelines 51, a single multi-cavity combined subsea oil storage bladder device can be expanded into multiple multi-cavity combined subsea oil storage bladder devices, thereby achieving high-production oil storage in oilfields. Figure 9 As shown.

[0072] The modular system for underwater oil and gas extraction and storage can complete underwater storage and transportation operations after offshore oil and gas extraction. Its advantages include: underwater oil storage is unaffected by sea ice, strong winds, and large waves, allowing for continuous production even in harsh sea conditions; it is isolated from fire sources and lightning, making the oil and gas less susceptible to ignition and eliminating the need for an inert gas system; and the oil storage tanks are installed on the seabed, significantly reducing the probability of collisions with ships and other objects. The underwater oil storage tanks are low-cost, highly efficient, and economically sound, significantly reducing daily operation and maintenance costs of oil fields and improving operational safety.

[0073] This invention relates to the exploitation, storage, and export of marine oil and gas resources. It modularizes the entire process of underwater oil and gas extraction, storage, and export, enabling rapid and efficient extraction and storage of seabed oil and gas under complex underwater conditions. Compared to traditional oil and gas storage methods, this method offers advantages such as small size, light weight, and simple structure, better adapting to the needs of underwater oil production operations. It also avoids the need to construct new production and processing platforms for offshore oil and gas field development. Furthermore, it allows for continuous extraction and storage operations under harsh sea conditions, improving the working environment for workers, preventing high-risk leaks, reducing production costs while ensuring safe development, and guaranteeing the efficiency of oil field development. This approach is conducive to the efficient development of offshore oil fields and has significant practical and promotional value.

[0074] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. A modular system for subsea oil and gas extraction and storage, characterized in that, The modular system for marine oil and gas subsea extraction and storage includes a subsea extraction module and a subsea storage module; The underwater mining module includes an underwater wellhead device (4) and an underwater separation device (5); The underwater storage module contains a multi-cavity combined underwater oil storage bladder device, which includes an outer frame (1) and an oil storage bladder (3). The outer frame (1) contains a frame (11) and a receiving space (12). The oil storage bladder (3) is fixed in the receiving space (12). The oil storage bladder (3) contains multiple independent chambers (31). The multiple independent chambers (31) are arranged in the left-right direction. Adjacent chambers (31) are separated by a partition (32). The underwater wellhead device (4), the underwater separation device (5), and the oil storage bladder (3) are connected in sequence.

2. The modular system for subsea oil and gas extraction and storage according to claim 1, characterized in that, The frame (11) contains an upper frame (111), a support column (112) and a lower frame (113) connected from top to bottom. The accommodating space (12) is cut into a trapezoidal cross section by a vertical section extending in the front-back direction. The top of the trapezoid faces upward and the bottom faces downward. The lower frame (113) can be connected and fixed to the seabed (8) by a suction anchor (2).

3. The modular system for subsea oil and gas extraction and storage according to claim 2, characterized in that, The frame (11) is a steel pipe concrete structure. The upper frame (111) contains multiple upper beams (114). The multiple upper beams (114) are spaced apart in the front-to-back direction. The upper beams (114) extend in the left-to-right direction. The support columns (112) are located around the frame (11). The oil storage bladder (3) has a cubic structure.

4. The modular system for subsea oil and gas extraction and storage according to claim 3, characterized in that, Multiple fixed flanges (13) are fixed on the upper crossbeam (114). The multiple fixed flanges (13) are arranged at intervals in the left and right direction. Multiple flange seats (33) are fixed on the upper surface of the oil reservoir (3). The flange seats (33) are connected and fixed to the fixed flanges (13). The upper crossbeam (114) can bear the weight of the oil reservoir (3).

5. The modular system for subsea oil and gas extraction and storage according to claim 3, characterized in that, The front, rear, left and right sides of the oil reservoir (3) are all fixedly connected with fixed lifting rings (34). The fixed lifting rings (34) are connected to the upper frame (111) through fixed chains (35). The fixed chains (35) can restrict the oil reservoir (3) from moving horizontally relative to the frame (11).

6. The modular system for subsea oil and gas extraction and storage according to claim 1, characterized in that, The oil reservoir (3) contains a shell, and the multiple independent chambers (31) are all located inside the shell. The shell is made of a flexible material. The shell contains an oil-resistant layer, a pressure-resistant layer and a corrosion-resistant layer stacked sequentially from the inside to the outside. The oil-resistant layer is made of fluororubber, the pressure-resistant layer is made of aramid fiber composite material, and the corrosion-resistant layer is made of chlorosulfonated polyethylene rubber.

7. The modular system for subsea oil and gas extraction and storage according to claim 1, characterized in that, The oil reservoir (3) is connected to multiple oil inlets (36) and multiple oil outlets (37). The oil inlets (36) and oil outlets (37) are connected to the reservoir chamber (31) one by one. Each oil inlet (36) is connected to a control valve (38).

8. The modular system for subsea oil and gas extraction and storage according to claim 7, characterized in that, The underwater wellhead device (4) is connected to the underwater separation device (5) via the first delivery pipeline (41), and the underwater separation device (5) is connected to the inlet end of each control valve (38) via the second delivery pipeline (51).

9. The modular system for subsea oil and gas extraction and storage according to claim 7, characterized in that, The modular system for marine oil and gas underwater extraction and storage also includes an export module, which contains a buoy (6), a third delivery pipeline (62), and an export tanker (7). The buoy (6) can float on the sea surface and is located above the outer frame (1). The inlet end of the third delivery pipeline (62) is connected to the oil outlet (37) in a one-to-one correspondence. The oil outlet (37) is located at the upper end of the oil storage bladder (3). The outlet end of the third delivery pipeline (62) is connected to the buoy (6). The buoy (6) is connected to the outer frame (1) through an anchor chain (61).

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