Offshore fluid transmission system and transmission method

Abstract

The invention relates to the technical field of offshore fluid transportation, in particular to an offshore fluid transmission system and a transmission method.The offshore fluid transmission system comprises a base, a turret and a hose transmission channel, the base is anchored to a seabed and provided with a pipeline assembly, and the pipeline assembly is connected with a submarine pipeline; the rotating tower is arranged on the base and comprises a rotating tower fixed end pipeline connected with the pipeline assembly, a transmission fluid slip ring connected with the rotating tower fixed end pipeline and a rotating tower rotating end pipeline connected with the transmission fluid slip ring; one end of the hose transmission channel is connected with a rotating end pipeline of the turret, and the other end of the hose transmission channel is connected with natural gas production, storage and unloading equipment on the floating liquefied natural gas ship; the base and the turret are arranged below the water surface. Ship-shore fluid transmission can be achieved, and the main body is located on the seabed and does not occupy sea surface resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore fluid transportation, in particular to an offshore fluid transportation system and a transportation method. BACKGROUND

[0002] At present, due to uneven global energy distribution, many energy demand countries are short of energy and need to import natural gas from energy exporting countries such as the Middle East, Africa, Southeast Asia and Australia. Based on the ship-shore liquefied gas transfer station transmission mode, there are mainly the following three kinds: 1, unloading arm transmission; 2, trestle and pipe gallery transmission; 3, floating transfer platform transmission.

[0003] However, when importing or exporting LNG, due to the development far away from the land, the shallow water depth off the coast, the lack of deep water ports, the unloading arm transmission cannot be realized, the geology does not allow the trestle to be built or the trestle cannot be laid in the short term, and the floating transfer platform transmission uses a floating low-temperature hose connection, which has low economic benefits and safety hazards. SUMMARY

[0004] In view of the defects of the prior art, the present application provides an offshore fluid transportation system and a transportation method, which can realize ship-shore fluid transportation, and the main body is located on the seabed, without occupying the sea surface resources.

[0005] In order to achieve the above purpose, the technical scheme provided by the present application is an offshore fluid transportation system, which comprises a base, a turret and a hose transmission channel, the base is anchored to the seabed, the base is provided with a pipeline assembly, the pipeline assembly is connected with a submarine pipeline; the turret is arranged on the base, the turret comprises a turret fixed end pipeline connected with the pipeline assembly, a transmission fluid slip ring connected with the turret fixed end pipeline, and a turret rotating end pipeline connected with the transmission fluid slip ring; one end of the hose transmission channel is connected with the turret rotating end pipeline, and the other end of the hose transmission channel is connected with a natural gas production, storage and unloading device on a floating liquefied natural gas ship; the base and the turret are arranged below the water surface.

[0006] Further, the rotatable part of the turret is connected with a yoke, and the yoke is connected with the floating liquefied natural gas ship through a mooring cable.

[0007] Further, the turret comprises a turret fixed part and a turret rotating part, the turret fixed part is connected with the base, and the turret fixed part is connected with the turntable through a bearing, so that the turntable can rotate relative to the base. The turntable is arranged below the water surface.

[0008] Further, the pipe assembly comprises a first base pipe connected with the submarine pipe, a tee pipe connected with the first base pipe, a second base pipe connected with the tee pipe, and the second base pipe is connected with the turret fixed end pipe.

[0009] Further, the second base pipe is provided with a hydraulic double-acting submarine pipe fluid stop valve, the hydraulic double-acting submarine pipe fluid stop valve is connected with a hydraulic oil slip ring on the turret through a fixed part valve control pipeline, and the hydraulic oil slip ring is connected with a hydraulic power unit through a rotating part valve control pipeline.

[0010] Further, the water surface is provided with a buoy, and the buoy is provided with a nitrogen receiving quick connector connected with the hydraulic power unit through a nitrogen transmission pipeline.

[0011] Further, the buoy is provided with a storage battery, the storage battery is connected with a solar panel, and the storage battery is connected with an ultra-high frequency antenna connected with the hydraulic power unit through a signal cable.

[0012] Further, the hose transmission channel comprises a first transmission hose and a second transmission hose, one end of the first transmission hose and one end of the second transmission hose are connected with the turret rotating end pipe, the other end of the first transmission hose and the other end of the second transmission hose are connected with a bow end valve, and the bow end valve is connected with the natural gas production, storage and unloading equipment.

[0013] Further, the natural gas production, storage and unloading equipment comprises an LNG liquefaction equipment, and the LNG liquefaction equipment is connected with the bow end valve through a pipe, and an emergency shut-off valve is arranged on the pipe.

[0014] Another aspect of the present application provides a marine fluid transmission method using the marine fluid transmission system. The fluid is transmitted from the submarine pipe to the natural gas production, storage and unloading equipment through the port of the pipe assembly arranged below the water surface, the pipe assembly, the turret fixed end pipe, the transmission fluid slip ring and the turret rotating end pipe in sequence, and then waits for external transmission.

[0015] The application has the advantages that: LNG can be directly transmitted, without the need of pipeline transportation of gaseous natural gas to land for liquefaction, and liquefaction can be performed on the floating LNG ship, thereby reducing the loss cost in the transportation process; the base is provided and anchored to the seabed, an anchor point is formed on the seabed, the whole system is more stable and reliable, can be flexibly moved according to the resource condition, and the limitation of the fixed gas field and the shore base receiving station connected by the trestle is avoided; the construction period is relatively short, and the time cost is reduced to a certain extent. In addition, the base and the turret are arranged below the water surface in the above-mentioned offshore fluid transmission system, the sea surface resource is not occupied, the system can be matched with mooring, has the effect of wind vane, and has a small turning radius. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of an offshore fluid transmission system in an embodiment of the application; Figure 2 FIG. 2 is a mooring schematic diagram of the offshore fluid transmission system in the embodiment of the application; Figure 3 FIG. 3 is a local enlarged view of the turret position in the embodiment of the application; 100, base, 110, pipeline assembly, 111, first base pipeline, 1111, normally open stop valve, 112, three-way pipeline, 113, second base pipeline, 1131, hydraulic double-acting seabed pipeline fluid stop valve, 1132, fixed part valve control pipeline, 114, pig receiver, 200, turret, 210, turret fixed part, 211, turret fixed end pipeline, 220, turret rotating part, 221, turret rotating end pipeline, 230, transmission fluid slip ring, 240, hydraulic oil slip ring, 250, rotating part valve control pipeline, 300, hose transmission channel, 310, first transmission hose, 320, second transmission hose, 330, bow end valve, 400, floating LNG ship, 410, natural gas production, storage and unloading equipment, 411, nitrogen supply system, 4111, normally closed stop valve, 412, combustion or exhaust system, 4121, normally closed stop valve, 413, LNG liquefaction equipment, 4131, emergency shutdown valve, 500, yoke, 510, mooring line, 511, starboard mooring line, 512, port mooring line, 600, anchor pile group, 610, first anchor pile, 620, second anchor pile, 630, third anchor pile, 700, rotary table, 710, hydraulic power unit, 720, connecting pipeline, ​800, buoy, 810, nitrogen receiving quick connector, 820, nitrogen transmission pipeline, 830, battery, 840, solar panel, 850, UHF antenna, 860, signal cable, 900, bearing, 910, upper bearing, 920, lower bearing, 10, seabed, 20, subsea pipeline, 30, water surface. DETAILED DESCRIPTION

[0017] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0018] Reference Figure 1 , shows a structural schematic diagram of a marine fluid transmission system in an embodiment of the present application, which comprises a base 100, a turret 200 and a hose transmission channel 300; the base 100 is anchored to a seabed 10, the base 100 is provided with a pipeline assembly 110, the pipeline assembly 110 is connected with a subsea pipeline 20 fixed to the seabed 10; the turret 200 is arranged on the base 100. The turret 200 comprises a turret rotating end pipeline 221, a turret fixed end pipeline 211 connected with the pipeline assembly 110 and a transmission fluid slip ring 230 connected with the turret fixed end pipeline 211 and the turret rotating end pipeline 221 respectively; one end of the hose transmission channel 300 is connected with the turret rotating end pipeline 221, and the other end of the hose transmission channel 300 is connected with a natural gas production, storage and unloading device 410 on a floating liquefied natural gas ship 400; the base 100 and the turret 200 are both arranged below a water surface 30.

[0019] The above marine fluid transmission system can directly transmit LNG, without the need of a trestle transmission to transport gaseous natural gas through a pipeline to land and then liquefy, and can liquefy on a floating liquefied natural gas ship, thereby reducing the loss cost in the transportation process; the base 100 is arranged and anchored to the seabed 10, an anchor point is formed on the seabed, the whole system is more stable and reliable, can be moved flexibly according to resource conditions, and the limitation of the connection of a fixed gas field and a shore-based receiving station by a trestle is avoided; the construction period is relatively short, and the time cost is reduced to a certain extent. In addition, the above marine fluid transmission system arranges the base 100 and the turret 200 below the water surface 30, does not occupy the sea surface resource, can be matched with mooring, has a wind vane effect, and has a small turning radius.

[0020] As Figure 3As shown, in a specific arrangement, in an embodiment, the main structure of the turret 200 includes a turret fixed part 210 and a turret rotating part 220, the turret fixed part 210 is connected with the turntable 700 through a bearing 900, in a specific arrangement, the bearing 900 includes an upper bearing 910 and a lower bearing 920, two independent bearings, such as Figure 3 As shown, the outer rings of the upper bearing 910 and the lower bearing 920 are connected with the turntable 700, and the inner rings of the upper bearing 910 and the lower bearing 920 are connected with the turret fixed part 210, so that the turntable 700 can rotate relative to the turret fixed part 210, and the upper bearing 910 and the lower bearing 920 are arranged on the turret fixed part 210, which is integrated and fixed on the base 100, so that the rotating part is stable and can prevent tilting, and thus the turntable 700 can freely rotate 360 degrees relative to the base 100, and further, the turret rotating part 220 is integrated on the turntable 700. The turret fixed end pipe 211 and the turret fixed part 210 are fixed on the base 100; the turret rotating part 220, the turret rotating end pipe 221 and the connecting pipe 720 are integrated on the turntable 700, and the floating liquefied natural gas ship 400 is connected to the connecting pipe 720 through the hose transmission passage 300.

[0021] In an embodiment, the turret rotating part 220 of the turret 200 is connected with a yoke 500, and the yoke 500 is connected with the floating liquefied natural gas ship 400 through a mooring cable 510. In a specific arrangement, the yoke 500 is indirectly connected with the turret rotating part 220 through the turntable 700. As shown, Figure 2 As shown, a mooring schematic diagram of the offshore fluid transmission system in an embodiment of the present application is shown, the floating liquefied natural gas ship 400 is connected with the yoke 500 through a starboard mooring cable 511 and a port mooring cable 512, the yoke 500 is connected with the turntable 700, and the floating liquefied natural gas ship 400 is driven by the wind through the starboard mooring cable 511 and the port mooring cable 512 to drive the yoke 500 and the turntable 700 to freely rotate 360 degrees around the base 100, and thus the wind vane effect is achieved, and the turning radius is small.

[0022] Specifically, as shown, Figure 1 In an embodiment, the seabed 10 is anchored with an anchor pile group 600, and the base 100 is fixed with the anchor pile group 600. In a specific embodiment, the anchor pile group 600 includes a first anchor pile 610, a second anchor pile 620 and a third anchor pile 630 arranged side by side. In this embodiment, the base 100 is fixed on the seabed 10 by using the anchor pile group 600 to improve the stability and reliability of the entire system. It should be noted that the specific arrangement of the anchor pile group 600, i.e. the number and arrangement of the anchor piles, can be arranged according to the actual working conditions and the seabed topography. This anchoring method not only improves the stability of the entire system, but also has a certain flexibility, which can be removed and re-anchored at a new location as needed.

[0023] In an embodiment, the pipe assembly 110 comprises a first base pipe 111 connected with the submarine pipe 20, a tee pipe 112 connected with the first base pipe 111, a second base pipe 113 connected with the tee pipe 112, and the second base pipe 113 is connected with the turret fixed end pipe 211. In an embodiment, the first base pipe 111 is provided with a normally open stop valve 1111. It should be noted that the specific arrangement of the pipe assembly 110 can be adjusted in terms of the number of pipes according to the specific conditions, as long as the fluid in the submarine pipe 20 can be introduced into the turret fixed end pipe 211.

[0024] Further, on the basis of the above-mentioned embodiment, the second base pipe 113 is provided with a hydraulic double-acting submarine pipe fluid stop valve 1131, and the actuator for opening and closing of the hydraulic double-acting submarine pipe fluid stop valve 1131 is a double-acting actuator of the paladon s-series, rotork, etc. The domestic valve is represented by the hydraulic actuator valve-low temperature ball valve produced by Suzhou Nuwei Valve Co., Ltd. The selection or customization of the hydraulic double-acting submarine pipe fluid stop valve 1131 needs to determine the specific parameters according to the specific working conditions. The actuator of the hydraulic double-acting submarine pipe fluid stop valve 1131 is connected with the hydraulic oil slip ring 240 on the turret 200 through the fixed part valve control pipeline 1132. The hydraulic oil slip ring 240 is connected with the hydraulic power unit 710 through the rotating part valve control pipeline 250.

[0025] As shown in FIG. 1, Figure 1 In an embodiment, the hydraulic oil slip ring 240 is integrated in the transmission fluid slip ring 230. The upper rotating part of the hydraulic oil slip ring 240 is integrated in the upper rotating part of the transmission fluid slip ring 230; the lower fixed part of the hydraulic oil slip ring 240 is integrated in the lower fixed part of the transmission fluid slip ring 230; when the upper rotating part of the transmission fluid slip ring 230 rotates, the upper rotating part of the hydraulic oil slip ring 240 is also rotated. It should be noted that the transmission fluid slip ring 230 in the present application is a fluid slip ring known in the art. The ports of the turret fixed end pipe 211 and the ports of the turret rotating end pipe 221 are connected to the transmission fluid slip ring 230, which can realize fluid penetration while being relatively rotatable. The hydraulic oil slip ring 240 is the same.

[0026] As shown in FIG. 1, Figure 1As shown, in an embodiment, the water surface 30 floats a buoy 800, the buoy 800 is provided with a nitrogen receiving quick connector 810, the nitrogen receiving quick connector 810 is connected to the hydraulic power unit 710 through a nitrogen transmission pipeline 820. In a specific arrangement, the turret rotating part 220 of the turret 200 is installed with a turntable 700, the turntable 700 is rotatably arranged on the upper part of the base 100, and the hydraulic power unit 710 is installed on the turntable 700.

[0027] In an embodiment, the buoy 800 is provided with a storage battery 830, the storage battery 830 is connected with a solar panel 840, the storage battery 830 is connected with an ultra-high frequency antenna 850, and the ultra-high frequency antenna 850 is connected with the hydraulic power unit 710 through a signal cable 860.

[0028] The above-mentioned offshore fluid transmission system has a hydraulic double-acting submarine pipeline fluid stop valve 1131 opening and closing monitoring system; the system operation logic is as follows: solar panels 840 are used to generate electricity, the electricity is stored in the storage battery 830, the ultra-high frequency antenna 850 receives the instruction signal transmitted from the floating liquefied natural gas ship 400, and controls the opening and closing of the hydraulic double-acting submarine pipeline fluid stop valve 1131; the ultra-high frequency antenna 850 transmits signals to the PLC (programmable logic controller) built in the hydraulic power unit 710 through the signal cable 860, controls the release of power of the nitrogen accumulator built in the hydraulic power unit 710, and drives the hydraulic double-acting submarine pipeline fluid stop valve 1131 to open and close through the rotating part valve control pipeline 250, the hydraulic oil slip ring 240, and the fixed part valve control pipeline 1132; the power of the nitrogen accumulator built in the hydraulic power unit 710 is derived from the nitrogen receiving quick connector 810; when it is detected that the power of the nitrogen accumulator built in the hydraulic power unit 710 is insufficient, the auxiliary ship punches nitrogen into the nitrogen accumulator built in the hydraulic power unit 710 through the nitrogen receiving quick connector 810 and the nitrogen transmission pipeline 820. Among them, the solar panel 840, the storage battery 830, the ultra-high frequency antenna 850, and the nitrogen receiving quick connector 810 are integrated on the buoy 800, and the buoy 800 floats on the water surface 30. The offshore fluid transmission system in the embodiment uses solar energy and nitrogen green energy as signal and driving energy, monitors the hydraulic double-acting submarine pipeline fluid stop valve 1131, and has the characteristics of high efficiency and intelligence.

[0029] In an embodiment, the tee pipeline 112 is connected with a pig receiver 114. Due to long-term fluid transportation, a large amount of fluid residues are accumulated in the submarine pipeline 20, which affects the flow rate or corrodes the pipe wall, and it is necessary to use a pig ball to clean the pipeline residues in a pressure driven manner, and the pig receiver 114 is used to receive the pig ball emitted from the pipeline end and take out the pig ball from the port.

[0030] In an embodiment, the soft pipe transmission channel 300 comprises a first transmission soft pipe 310 and a second transmission soft pipe 320, one end of the first transmission soft pipe 310 and one end of the second transmission soft pipe 320 are connected with the turret rotating end pipe 221, the other end of the first transmission soft pipe 310 and the other end of the second transmission soft pipe 320 are connected with the bow end valve 330, and the bow end valve 330 is connected with the natural gas production, storage and unloading device 410.

[0031] In an embodiment, the natural gas production, storage and unloading device 410 comprises a nitrogen supply system 411, a combustion or exhaust system 412 and an LNG liquefaction device 413. The nitrogen supply system 411 is connected with the bow end valve 330 through a pipe, and a normally closed stop valve 4111 is arranged on the pipe. The combustion or exhaust system 412 is connected with the bow end valve 330 through a pipe, and a normally closed stop valve 4121 is arranged on the pipe. The LNG liquefaction device 413 is connected with the bow end valve 330 through a pipe, and an emergency shut-off valve 4131 is arranged on the pipe.

[0032] The LNG or natural gas in the submarine pipeline 20 is sequentially transmitted into the LNG liquefaction device 413 through the port of the first base pipe 111, the first base pipe 111, the normally open stop valve 1111, the three-way pipe 112, the hydraulic double-acting submarine pipeline fluid stop valve 1131, the turret fixed end pipe 211, the transmission fluid slip ring 230, the turret rotating end pipe 221, the connecting pipe 720, the soft pipe transmission channel 300, the emergency shut-off valve 4131 and waits for external transport.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0035] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixing" should be construed as broad terms, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or a middle element can exist at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

Claims

1. A marine fluid transport system, characterized in that: include A base anchored to the seabed, the base being provided with a pipe assembly connected to a subsea pipe; A turret is disposed on the base. The turret includes a turret fixed end pipe connected to the pipe assembly, a transfer fluid slip ring connected to the turret fixed end pipe, and a turret rotating end pipe connected to the transfer fluid slip ring. The hose transmission channel is connected at one end to the pipeline at the rotating end of the turret, and at the other end to the natural gas production, storage and unloading equipment on the floating liquefied natural gas vessel. Both the base and the turret are positioned below the water surface.

2. The marine fluid transport system according to claim 1, characterized in that: The rotatable part of the turret is connected to a yoke, which is connected to the floating liquefied natural gas vessel via a mooring cable.

3. The marine fluid transport system according to claim 1, characterized in that: The turret includes a turret fixing part and a turret rotating part. The turret fixing part is connected to the base and is connected to the turntable through a bearing so that the turntable can rotate relative to the base. The turntable is positioned below the water surface.

4. The marine fluid transport system according to any one of claims 1-3, characterized in that: The pipeline assembly includes a first base pipe connected to the subsea pipeline, a tee pipe connected to the first base pipe, and a second base pipe connected to the tee pipe, wherein the second base pipe is connected to the turret fixed end pipe.

5. The marine fluid transport system according to claim 4, characterized in that: The second base pipeline is equipped with a hydraulic double-acting subsea pipeline fluid shut-off valve. The hydraulic double-acting subsea pipeline fluid shut-off valve is connected to the hydraulic oil slip ring on the turret through a fixed valve control pipeline. The hydraulic oil slip ring is connected to the hydraulic power unit through a rotating valve control pipeline.

6. The marine fluid transport system according to claim 5, characterized in that: A buoy is floating on the water surface. The buoy is equipped with a nitrogen receiving quick connector, which is connected to the hydraulic power unit through a nitrogen transmission pipeline.

7. The marine fluid transport system according to claim 6, characterized in that: The pontoon is equipped with a battery, which is connected to a solar panel and an ultra-high frequency antenna. The ultra-high frequency antenna is connected to the hydraulic power unit via a signal cable.

8. The marine fluid transport system according to any one of claims 1-3, characterized in that: The hose transmission channel includes a first transmission hose and a second transmission hose. One end of the first transmission hose and one end of the second transmission hose are connected to the rotating end pipeline of the turret. The other end of the first transmission hose and the other end of the second transmission hose are connected to the bow end valve. The bow end valve is connected to the natural gas production, storage and unloading equipment.

9. The marine fluid transport system according to any one of claims 1-3, characterized in that: The natural gas production, storage and unloading equipment includes an LNG liquefaction unit; the LNG liquefaction unit is connected to the bow end valve via a pipeline, and an emergency shut-off valve is installed on the pipeline.

10. A method for transporting fluids at sea, characterized in that: The marine fluid transport system of any one of claims 1-3 shall be used; The fluid is transported from the subsea pipeline through the port of the pipeline assembly located below the water surface, the pipeline assembly, the fixed end pipeline of the turret, the transfer fluid slip ring, and the rotating end pipeline of the turret, and then through the hose transmission channel to the natural gas production, storage and unloading equipment for external transmission.

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