Multi-cavity combined underwater oil storage bag device

Abstract

The utility model discloses a multi-cavity combined type underwater oil storage bag device, belongs to the technical field of offshore oil and gas storage and output, and aims to solve the problem that an existing offshore oil storage and drainage device is high in construction cost, the multi-cavity combined type underwater oil storage bag device 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 arranged in the containing space (12). The oil storage bag (3) is fixed in the containing space (12), a plurality of mutually independent bag chambers (31) are arranged in the oil storage bag (3) and arranged in the left-right direction, and every two adjacent bag chambers (31) are isolated through an interlayer (32). The multi-cavity combined type underwater oil storage bag device 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 multi-cavity combined underwater oil storage bladder device. 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 multi-cavity combined underwater oil storage bladder device. This device is constructed underwater, with relatively low costs for the outer frame and the oil storage bladder. It also 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 multi-cavity combined underwater oil storage bladder device includes an outer frame and an oil storage bladder. The outer frame contains a frame and a receiving space. The oil storage bladder is fixed in the receiving space. The oil storage bladder contains multiple independent chambers arranged in a left-right direction. Adjacent chambers are separated by partitions.

[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 multi-chamber combined underwater oil storage bladder device also includes an input pipeline, which is connected to the inlet end of each control valve.

[0013] The multi-cavity combined underwater oil storage bladder device also includes an output pipeline and a buoy. The buoy can float on the sea surface and is located above the outer frame. The inlet end of the output 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 output pipeline is connected to the buoy. The buoy is connected to the outer frame through an anchor chain.

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

[0015] 1. When in use, the multi-cavity combined underwater oil storage bladder device can store crude oil after being connected to the underwater oil production equipment. The operation is convenient and provides a safety guarantee for subsequent external transportation operations. Moreover, there is no need to build a new production and processing platform or use an FPSO, which improves the efficiency of operations and saves a lot of time and costs for offshore operations.

[0016] 2. The multi-cavity combined underwater oil storage bladder device is economical, practical, and safe. It can store oil in areas that do not require large amounts of land and is better adapted to underwater environments. Furthermore, the bladder, made of flexible materials, can adapt to different shapes and sizes, making it more flexible.

[0017] 3. The multi-chamber combined underwater oil storage bladder device has good compatibility and can expand its storage capacity by connecting multiple oil storage bladders. It also has multiple backup protection measures in case of an accident, making it safer and more convenient. Furthermore, each oil storage bladder is equipped with an individual frame, ensuring that each device can operate independently or in conjunction with others. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a front view schematic diagram of the multi-cavity combined underwater oil storage bladder device of this utility model.

[0020] Figure 2 This is a right-side view of the multi-cavity combined underwater oil storage bladder device of this utility model.

[0021] Figure 3 This is a schematic diagram of an outer frame structure.

[0022] Figure 4 This is a schematic diagram showing the left sac chamber as full.

[0023] Figure 5 This is a schematic diagram showing the left and middle sac chambers in a full state.

[0024] Figure 6 This is a schematic diagram showing that the left, middle, and right sac chambers are all full.

[0025] 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.

[0026] 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.

[0027] Figure 9 This is a schematic diagram of the combined connection of the multi-cavity combined underwater oil storage bladder device.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Outer frame; 2. Suction anchor; 3. Oil reservoir; 4. Input pipeline; 5. Output pipeline; 6. Buoy; 7. Seabed; 8. Export tanker;

[0030] 11. Frame; 12. Accommodation space; 13. Fixing flange;

[0031] 21. Drainage hole;

[0032] 31. Chamber; 32. Divider; 33. Flange seat; 34. Fixing ring; 35. Fixing chain; 36. Oil inlet; 37. Oil outlet; 38. Control valve;

[0033] 61. Anchor chain;

[0034] 111. Upper frame; 112. Supporting column; 113. Lower frame; 114. Upper beam; 115. Lower beam;

[0035] 311. Left sac chamber; 312. Middle sac chamber; 313. Right sac chamber. Detailed Implementation

[0036] 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.

[0037] 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 1 The 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.

[0038] like Figure 1 and Figure 2 As shown in the embodiment of this utility model, a multi-cavity combined underwater oil storage bladder device 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.

[0039] like Figures 1 to 3As 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 by a vertical section extending in the front-to-back direction, resulting in a trapezoidal cross-section, 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 7 via 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.

[0040] 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.

[0041] like Figures 1 to 3 As 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.

[0042] 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.

[0043] 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.

[0044] The oil reservoir 3 includes a shell, a partition 32, and a plurality of independent chambers 31, all 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.

[0045] 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.

[0046] 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.

[0047] 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 nearshore or offshore oil reservoirs, is economical and practical, and can significantly extend the service life of oil reservoirs at a reasonable cost, reducing maintenance costs and replacement frequency.

[0048] 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.

[0049] 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.

[0050] 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 7. The multi-cavity combined underwater oil reservoir device also includes an input pipeline 4, the outlet of which is connected to the inlet end of each control valve 38.

[0051] like Figures 1 to 2 As shown, the multi-cavity combined underwater oil storage bladder device also includes an output pipeline 5 and a buoy 6. The buoy 6 can float on the sea surface and is located above the outer frame 1. There are multiple output pipelines 5. The inlet end of the output pipeline 5 is connected to the oil outlet 37 in a one-to-one correspondence. The outlet end of the output pipeline 5 is connected to the buoy 6. The buoy 6 is connected to the upper part of the outer frame 1 through an anchor chain 61 and is moored on the sea surface through the anchor chain 61.

[0052] 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.

[0053] The following describes the installation method of the above-mentioned multi-cavity combined underwater oil storage bladder device, which includes the following steps:

[0054] Measure the direction of ocean currents on the seabed 7, for example, the current direction is direction A or direction B, such as... Figure 2 As shown;

[0055] The connected outer frame 1 and oil storage tank 3 are hoisted as a whole and lowered into the seabed 7 using their own weight. The multi-cavity combined underwater oil storage tank device is installed on the seabed 7. During installation, the front or rear side of the outer frame 1 is ensured to face the ocean current direction A or B. The outer frame 1 is connected and fixed to the seabed 7 using a suction anchor 2. Facing the front or rear side of the outer frame 1 to 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.

[0056] 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, oil storage operations can only be carried out when the pipeline of the underwater oil production equipment is connected to the oil inlet connection end of the input pipeline 4, that is, when the oil production pipeline is connected to the oil storage tank 3.

[0057] In use, crude oil is input into the chamber 31 of the required oil storage sac 3 through the output pipeline 5 and the control valve 38, and the oil storage sac 3 stores the crude oil.

[0058] The oil tanker 8 is connected to the outlet end of the output pipeline 5, which is connected to the chamber 31 of the required oil storage sac 3, so that the crude oil in the chamber 31 of the required oil storage sac 3 is output to the oil tanker 8.

[0059] 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 input pipeline 4. The flow rate can be distributed to the three chambers: the left chamber 311, the middle chamber 312, and the right chamber 313.

[0060] When the oil storage reaches the condition for external transportation, the external transportation tanker 8 approaches the float 6 and connects to the output pipeline 5 corresponding to the pre-transported oil chamber, thus transporting the oil stored in that chamber to the external transportation tanker 8. In the event of partial damage to the bladder, after determining that one or two of the left bladder 311, middle bladder 312, and right bladder 313 are leaking, the control valve 38 corresponding to the leaking bladder can be controlled to continue oil storage operations using the other two or one bladder without stopping oil production.

[0061] The multi-cavity combined underwater oil storage bladder device is suitable for both offshore and nearshore applications, such as... Figure 7 and Figure 8 As shown. Of course, for offshore oil fields, the suction anchor 2 fixing method can be adjusted to a pile-type fixing method. When carrying out subsea oil storage in high-production oil fields, multiple multi-cavity combined subsea oil storage bladder devices can be installed. By connecting the oil production equipment to the oil inlet connection end of their respective input pipelines 4, a single oil storage bladder can be expanded into multiple oil storage bladders, thereby realizing high-production oil storage in oil fields, such as... Figure 9 As shown.

[0062] The multi-cavity combined underwater oil storage bladder device 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 bladder is installed on the seabed, significantly reducing the probability of collision with ships and other objects. The underwater oil storage bladder has low construction costs, high efficiency, and good economic performance, significantly reducing the daily operation and maintenance costs of oil fields and improving operational safety.

[0063] 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 multi-cavity combined underwater oil storage bladder device, characterized in that, The multi-cavity combined underwater oil storage bladder device 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).

2. The multi-cavity combined underwater oil storage bladder device 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 (7) by a suction anchor (2).

3. The multi-cavity combined underwater oil storage bladder device 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 multi-cavity combined underwater oil storage bladder device 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 multi-cavity combined underwater oil storage bladder device 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 multi-cavity combined underwater oil storage bladder device 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 multi-cavity combined underwater oil storage bladder device 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 multi-cavity combined underwater oil storage bladder device according to claim 7, characterized in that, The multi-chamber combined underwater oil storage bladder device also includes an input line (4), which is connected to the inlet end of each control valve (38).

9. The multi-cavity combined underwater oil storage bladder device according to claim 7, characterized in that, The multi-cavity combined underwater oil storage bladder device also includes an output pipeline (5) and a float (6). The float (6) can float on the sea surface and is located above the outer frame (1). The inlet end of the output pipeline (5) is connected to the oil outlet (37) one by one. The oil outlet (37) is located at the upper end of the oil storage bladder (3). The outlet end of the output pipeline (5) is connected to the float (6). The float (6) is connected to the outer frame (1) through an anchor chain (61).

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