Submarine cable insulation medium recovery cover, modular recovery device and recovery method

Abstract

The application provides a submarine cable insulation medium recovery cover, a modular recovery device and a recovery method, and the submarine cable insulation medium recovery cover comprises an oil collection layering module, the oil collection layering module comprises an outer cover, an inner cover and a layering bin, a plurality of first supporting legs are arranged at the bottom of the outer cover, the inner cover is fixedly arranged in the outer cover, and an oil inlet is formed in the inner cover, the layering bin is fixedly arranged in the outer cover, an oil-water separation membrane is arranged in the layering bin, the layering bin is divided into an upper bin and a lower bin by the oil-water separation membrane, the oil-water separation membrane only allows seawater to pass through, a backflow pipe is arranged on the lower bin and communicates with seawater outside, an oil outlet and an injection port are arranged on the upper bin, the oil outlet is arranged close to the top of the upper bin, the injection port is used for injecting a catalyst and seawater into the upper bin, and the upper bin communicates with the inner cover through a connecting pipe. The recovery cover used for oil collection is adopted, so that the insulation medium can be quickly layered with seawater in the recovery cover, and the recovery efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine cable insulation medium recovery, in particular to a submarine cable insulation medium recovery cover, a modular recovery device and a recovery method. BACKGROUND

[0002] With the increasing demand for global marine communication and power transmission, the safety and stability of submarine cables, which serve as an important means of communication and energy transmission connecting continents, are particularly important. As an important type of submarine cable, oil-filled submarine cables have occupied an important position in the field of submarine cables due to their excellent insulation performance and heat dissipation performance.

[0003] Due to the complex seabed geological conditions of submarine cable pipelines, under the reciprocating scouring of waves and ocean currents, the seabed conditions change, leading to the exposure and suspension of submarine cables. The suspended pipelines swing back and forth under the action of waves and ocean currents, causing fatigue stress aggregation and further leading to the breakage of part of the pipelines. This not only may cause the failure of cable transmission function, but also may damage the marine and coastal environment due to the leakage of insulation medium in oil-filled submarine cables, causing huge economic losses and difficult-to-repair ecological damage. The repair of underwater fault points is difficult and has a long repair cycle, so temporary recovery equipment is needed to recover the leaked insulation medium to reduce the negative impact of the accident.

[0004] Existing submarine cable insulation medium recovery devices mostly use large recovery covers designed to collect oil. The oil collection cover has both oil collection and storage functions, and is built separately for specific conditions of a project. For example, Chinese patent application CN117727513A. Since the insulation medium is continuously discharged outward at positive pressure after the submarine cable is damaged, the insulation medium flows at a relatively fast speed, and the stratification efficiency with seawater is slow, resulting in a high seawater proportion in the recovered liquid and low recovery efficiency. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provides a submarine cable insulation medium recovery cover, a modular recovery device and a recovery method. The recovery cover for collecting oil is used separately, allowing the insulation medium to stratify quickly with seawater in the recovery cover, thereby improving the recovery efficiency.

[0006] To solve the above technical problems, in a first aspect, the present application provides a submarine cable insulation medium recovery cover, comprising an oil collection and stratification module, the oil collection and stratification module comprising an outer cover, an inner cover and a stratification bin.

[0007] The bottom of the outer cover is provided with a plurality of first supporting legs, and the outer cover is fixed to the seabed through the plurality of first supporting legs.

[0008] The inner cover is fixedly arranged in the outer cover, and the inner cover is provided with an oil inlet through which the leaked insulation medium of the submarine cable enters the inner cover.

[0009] The layered bin is fixedly arranged in the outer cover, and an oil-water separation membrane is arranged in the layered bin, which separates the layered bin into an upper bin and a lower bin, and the oil-water separation membrane only allows seawater to pass through, the lower bin is provided with a backflow pipe which is in communication with seawater outside, the upper bin is provided with an oil outlet and an injection inlet, the oil outlet is arranged near the top of the upper bin, the injection inlet is used for injecting a catalyst and seawater into the upper bin, the catalyst is used for promoting the stratification of the insulation medium and seawater, and the upper bin is in communication with the inner cover through a connecting pipe.

[0010] Further, the lower bin is arranged above the inner cover.

[0011] Further, the first supporting leg comprises a first telescopic rod and a first bottom plate, a first connecting seat is fixedly arranged on the first bottom plate, one end of the first telescopic rod is connected with the outer cover, the other end of the first telescopic rod is hingedly connected with the first connecting seat, and a ballast is arranged on the upper surface of the first bottom plate.

[0012] Further, one end of the first telescopic rod is detachably connected with the outer cover, a first supporting leg bolt is arranged on the side surface of the outer cover, and the first supporting leg is detachably connected with the first supporting leg bolt.

[0013] Further, the outer cover is in the shape of a circular truncated cone.

[0014] In the second aspect, the application provides a submarine cable insulation medium modularized recovery device, which comprises an oil storage module, a sealing collection clamp and a flexible pipe, the oil storage module is arranged at least one, the oil storage module is provided with a recovery port, the oil storage module is connected with a recovery ship through the recovery port, the sealing collection clamp and the oil inlet, the oil outlet and the oil storage module are connected through the flexible pipe, and the sealing collection clamp is used for clamping at the leakage point of the submarine cable, so that the leaked insulation medium of the submarine cable can enter the inner cover, the layered bin and the oil storage module in turn through the flexible pipe.

[0015] Further, the oil storage module comprises an oil storage tank, the oil storage tank is provided with an input port and a recovery port, a telescopic separation membrane is arranged in the oil storage tank, the telescopic separation membrane is used for balancing the pressure difference between the inside and outside of the oil storage tank, one end of the oil storage tank is opened and provided with a separation net, and the separation net is used for isolating impurities outside.

[0016] Further, the oil storage module comprises a shell, the oil tank is fixed in the shell, a second supporting leg is arranged on the shell, the second supporting leg comprises a second telescopic rod and a second bottom plate, a second connecting seat is fixedly arranged on the second bottom plate, one end of the second telescopic rod is connected with the shell, the other end of the second telescopic rod is hingedly connected with the second connecting seat, and a ballast is arranged on the upper surface of the second bottom plate.

[0017] Further, the sealing collection clamp comprises a sealing cylinder, the sealing cylinder comprises two half cylinders which are detachably connected, the two half cylinders are sealingly connected, and one of the half cylinders is connected with a flexible pipe.

[0018] In a third aspect, the present application provides a method for recovering insulating medium of submarine cable, comprising:

[0019] S1, determining the number of oil storage modules according to the oil leakage speed and operation and maintenance requirements, adjusting the first supporting leg and the second supporting leg according to the seabed conditions of the installation point, hoisting the oil collection and layering module and the oil storage module and placing them at the pre-installation site, adjusting the first supporting leg and the second supporting leg again to level, and placing the ballast on the first supporting leg and the second supporting leg to press and fix the ballast;

[0020] S2, clamping the sealing collection clamp at the leakage point of the submarine cable, connecting the sealing collection clamp, the insulating medium recovery cover of the submarine cable and the oil storage module through the flexible pipe;

[0021] S3, the recovery ship injects the catalyst and seawater into the layering bin of the insulating medium recovery cover of the submarine cable through the injection port, and simultaneously, the ship-borne oil pump is connected to the recovery port of the last oil storage module through the recovery pipeline to collect the insulating medium.

[0022] The present application has the following advantages:

[0023] 1. The insulating medium recovery cover of the submarine cable of the present application is only used for oil collection; by arranging the outer cover, the inner cover and the layering bin can be protected from anchor impact and marine organism impact; by arranging the inner cover, the flow rate of the insulating medium can be reduced, and the layering efficiency of the insulating medium in the layering bin can be improved; by arranging the layering bin and arranging the oil-water separation membrane and the injection port in the layering bin, the oil-water separation membrane can balance the water pressure inside and outside the layering bin, and prevent the insulating medium from flowing out of the layering bin, and the injection port can inject the catalyst to accelerate the layering of the insulating medium and seawater, so that the oil-water mixture content in the recovered liquid can be reduced in a physical and chemical combined manner, and the recovery efficiency is improved.

[0024] 2. By arranging the lower bin above the inner cover, the flow rate of the insulating medium entering the upper bin from the inner cover can be further reduced.

[0025] 3. The outer cover of the present invention is designed in the shape of a frustum, which can reduce the impact of ocean currents and waves on the outer cover.

[0026] 4. Compared to existing technologies where recovery hoods are difficult to reuse in other projects and have poor flexibility, scalability, and recyclability, this invention adopts a modular design. It consists of a submarine cable insulation medium recovery hood, an oil storage module, and a sealing collection clamp. The submarine cable insulation medium recovery hood is used to collect oil, the oil storage module is used to store oil, and the required number of oil storage modules can be determined according to the leakage rate. The sealing collection clamp is used to hold the submarine cable and guide the insulation medium into the recovery hood. On the one hand, it can reduce the construction difficulty and cost of the equipment and adapt to the oil storage space requirements of different projects. On the other hand, the volume of a single oil storage tank is also reduced, making it more adaptable to complex seabed environments and reducing installation difficulty.

[0027] 5. The oil storage module of the present invention can balance the pressure difference between the inside and outside of the oil storage tank by setting a retractable diaphragm, and can isolate external impurities and prevent marine organisms from parasitizing inside the oil storage tank by setting a mesh.

[0028] 6. By providing an outer shell, this invention can protect the oil storage tank and reduce the impact of waves and external collisions.

[0029] 7. By setting up a first and second support foot that can be extended and adjusted in angle, the present invention enables the submarine cable insulation medium recovery cover and oil storage module to be fixed according to the seabed environment. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the submarine cable insulation dielectric recovery cover of the present invention;

[0031] Figure 2 This is a schematic diagram of the modular recycling device for submarine cable insulation media of the present invention;

[0032] Figure 3 This is a schematic diagram of the oil storage module of the present invention;

[0033] Figure 4 This is a diagram showing the arrangement of the submarine cable insulation medium recovery cover on the inclined plane according to the present invention;

[0034] Figure 5 This is a diagram showing the arrangement of the oil storage module of the present invention on an inclined plane.

[0035] Reference numerals: Oil collection and stratification module 1; outer cover 11; inner cover 12; oil inlet 121; stratification chamber 13; oil-water diaphragm 131; oil outlet 132; injection port 133; return pipe 134; first support leg 14; first support leg bolt 15; ballast 16; connecting pipe 17; mounting hardware 18; first valve 191; second valve 192;

[0036] Oil storage module 2; oil storage tank 21; outer shell 22; inlet 23; recovery port 24; retractable diaphragm 25; mesh screen 26; second support leg 27; fixed support leg 28;

[0037] Sealed collection clamp 3;

[0038] Flexible tube 4;

[0039] Submarine cable 5; Leak point 51. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment provides a submarine cable insulation medium recovery cover, including an oil collection and stratification module 1, which includes an outer cover 11, an inner cover 12, and a stratification compartment 13.

[0043] The outer cover 11 is frustum-shaped with an opening at its bottom. Multiple first support legs 14 are provided along the bottom edge of the outer cover 11. Each first support leg 14 includes a first telescopic rod and a first base plate. A first connecting seat is welded to the first base plate. One end of the first telescopic rod is threaded to the outer cover 11, and the other end is hinged to the first connecting seat. The first base plate is placed on the seabed, and ballast material 16 is provided on its upper surface to fix the outer cover 11 to the seabed. The first telescopic rod includes parallel fixed rods and movable rods. Multiple positioning holes are provided along the length of the fixed rod, and the movable rod is fixed to different positioning holes by bolts to achieve telescopic movement.

[0044] The outer cover 11 has pre-drilled first support bolts 15 on its side. The first support legs 14 can be fixed to the side of the outer cover 11 by the first support bolts 15, thus adapting to different terrains, such as... Figure 4 As shown.

[0045] The top of the outer cover 11 is equipped with a hanging hardware 18.

[0046] The inner cover 12 is fixedly installed inside the outer cover 11. The inner cover 12 is a sealed structure and can be fixed to the outer cover 11 by welding or bolts. An oil inlet 121 is opened on the side of the inner cover 12, and the insulating medium leaked from the submarine cable 5 can enter the inner cover 12 through the oil inlet 121. A first valve 191 is installed on the oil inlet 121.

[0047] The layered tank 13 is fixedly arranged at the top of the outer cover 11 through the hanging fitting 18, the oil-water separation membrane 131 is arranged in the layered tank 13, the oil-water separation membrane 131 divides the layered tank 13 into an upper layer tank and a lower layer tank, the oil-water separation membrane 131 only allows seawater to pass through, the bottom of the lower layer tank is provided with a backflow pipe 134, the backflow pipe 134 is in communication with seawater outside, the lower layer tank is arranged above the inner cover 12, the upper layer tank is provided with an oil outlet 132 and an injection port 133, the oil outlet 132 is arranged close to the top of the upper layer tank, the injection port 133 is used for injecting a catalyst and seawater into the upper layer tank, the catalyst is used for promoting the stratification of the insulating medium and seawater, the upper layer tank is in communication with the top of the inner cover 12 through the connecting pipe 17, the second valve 192 is arranged on the injection port 133, the first valve 191 and the second valve 192 are in a normally closed state when the insulating medium is not recovered, so that the inner cover 12 and the layered tank 13 are isolated from the outside.

[0048] In the embodiment, the oil-water separation membrane 131 is a film composed of a hydrophilic and oleophobic high-molecular polymer material, such as a PTS / PSF (titanium dioxide phosphate / poly sulfone) composite film, which can separate oil and water by the difference in material porosity and the control of oil-water affinity (contact angle).

[0049] Embodiment 2

[0050] As shown in Figure 2 , the embodiment provides a submarine cable insulating medium modularized recovery device, which comprises an oil collecting and stratifying module 1, an oil storage module 2, a sealing collection clamp 3 and a flexible pipe 4, the sealing collection clamp 3 and the oil inlet 121 of the oil collecting and stratifying module 1, the oil outlet 132 of the oil collecting and stratifying module 1 and the oil storage module 2 are connected through the flexible pipe 4, the sealing collection clamp 3 is used for clamping at the leakage point 51 of the submarine cable 5, so that the insulating medium leaked from the submarine cable 5 can enter the inner cover 12, the layered tank 13 and the oil storage module 2 in sequence through the flexible pipe 4.

[0051] In the embodiment, four oil storage modules 2 are arranged, as shown in Figure 3 , the oil storage module 2 comprises an outer shell 22 and an oil storage tank 21, the oil storage tank 21 is fixedly arranged in the outer shell 22, a plurality of second supporting legs 27 and a fixed supporting leg 28 are arranged at the bottom of the outer shell 22, the structure of the second supporting leg 27 is the same as that of the first supporting leg 14, the outer shell 22 is fixed on the seabed through the second supporting leg 27, the fixed supporting leg 28 and the ballast 16, and can be adjusted through the second supporting leg 27 to adapt to different environments, as shown in Figure 5 .

[0052] As shown in Figure 3As shown, the oil storage tank 21 is provided with an input port 23 and a recovery port 24, the oil storage module 2 is connected to the recovery ship through the recovery port 24, the oil storage tank 21 is provided with an extendable diaphragm 25, the extendable diaphragm 25 is used to balance the pressure difference between the inside and outside of the oil storage tank 21, one end of the oil storage tank 21 is opened and provided with a screen 26, and the screen 26 is used to isolate external impurities. In this embodiment, the extendable diaphragm 25 should have good extensibility and water / oil separation performance, and can be made of materials such as silica gel and polyethylene. Figure 3 In this embodiment, three possible types of extendable diaphragm 25 are shown in dashed lines.

[0053] The sealed collection clamp 3 includes a sealed cylinder, the sealed cylinder includes two detachably connected half cylinders, the two half cylinders are connected by bolts, and a sealing strip is arranged between the two half cylinders. A sealing strip is also arranged between the half cylinders and the submarine cable 5, so that after the sealed collection clamp 3 is clamped on the submarine cable 5, the leakage point 51 can be isolated from the outside world. One of the half cylinders is connected with the flexible pipe 4 and connected with the oil inlet 121 of the oil collection and layering module 1 through the flexible pipe 4.

[0054] It can be understood that the leaked insulating medium flows to the inner cover 12 through the flexible pipe 4, then flows into the upper layer of the layering bin 13 through the connecting pipe 17, and the insulating medium with relatively low density is collected in the upper part of the upper layer and is discharged to the oil storage module 2 through the oil outlet 132. The oil-water diaphragm 131 in the layering bin 13 is movable to balance the pressure difference between the inside and outside, and the lower layer of seawater is discharged back to the sea through the backflow pipe 134, thereby increasing the content of the insulating medium in the recovered liquid and improving the recovery efficiency. At the same time, the catalyst (such as nitrogen, methanol, etc.) can be injected into the upper layer through the injection port 133 to complete the supplement of the catalyst and promote the layering of the insulating medium and seawater, thereby further improving the recovery efficiency.

[0055] In the operation and maintenance stage of recovering the insulating medium, the recovery ship connects the oil suction pipe to the recovery port 24 of the last oil storage tank 21 to suck out the insulating medium in the oil storage tank 21, that is, the recovery of the insulating medium is completed.

[0056] Embodiment 3

[0057] Based on embodiment 2, the present embodiment provides a submarine cable insulating medium recovery method, which comprises the following steps:

[0058] S1, determining the overall arrangement scheme of the insulating medium recovery device according to the seabed condition near the leakage point 51 of the oil-filled submarine cable 5, determining the size of the oil collection and layering module 1 according to the seabed and anti-scour arrangement condition near the leakage point, and determining the volume and number of the oil storage module 2 according to the leakage speed of the oil-filled submarine cable 5, the seabed condition near the leakage point 51, and the operation and maintenance demand; the oil collection and layering module 1 and the oil storage module 2 are prefabricated in the factory.

[0059] According to the seabed conditions of the installation site, the first support leg 14 and the second support leg 27 are adjusted, the oil collection and layering module 1 and the oil storage module 2 are hoisted and placed at the pre-installation site, and the first support leg 14 and the second support leg 27 are adjusted again to level, and the ballast 16 is placed on the first support leg 14 and the second support leg 27 to ballast and fix;

[0060] S2, clamp the sealing collection clamp 3 at the leakage point 51 of the submarine cable 5, connect the sealing collection clamp 3, the submarine cable insulation medium recovery cover, and the oil storage module 2 through the flexible pipe 4;

[0061] S3, open the second valve 192, and the recovery ship injects catalyst and seawater into the layering bin 13 of the submarine cable insulation medium recovery cover through the injection port 133, the injection of catalyst can promote the layering of insulation medium and seawater, and the injection of seawater can increase the internal pressure of the pipe of the internal recovery channel and balance the pressure between the internal recovery channel and the outside seawater; at the same time, the ship-borne oil pump is connected to the recovery port 24 of the last oil storage module 2 through the recovery pipeline to collect the insulation medium. Before the ship-borne oil pump is started, the first valve 191 is closed to prevent the injected seawater and catalyst from flowing back into the submarine cable pipeline.

[0062] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A subsea cable insulation medium recovery boot, characterized by: The application relates to a layered oil collection module, which comprises an outer cover (11), an inner cover (12) and a layered bin (13). The bottom of the outer cover (11) is provided with a plurality of first supporting legs (14), and the outer cover (11) is fixed on the seabed through the plurality of first supporting legs (14). The inner cover (12) is fixedly arranged in the outer cover (11), and the inner cover (12) is provided with an oil inlet (121), through which the insulating medium leaked from a cable enters the inner cover (12). The layered bin (13) is fixedly arranged in the outer cover (11), and the layered bin (13) is provided with an oil-water separation membrane (131), which divides the layered bin (13) into an upper bin and a lower bin, the oil-water separation membrane (131) only allows seawater to pass through, the lower bin is provided with a backflow pipe (134) which is communicated with seawater, the upper bin is provided with an oil outlet (132) and an injection inlet (133), the oil outlet (132) is arranged near the top of the upper bin, the injection inlet (133) is used for injecting a catalyst and seawater into the upper bin, the catalyst is used for promoting the stratification of the insulating medium and seawater, and the upper bin is communicated with the inner cover (12) through a connecting pipe (17).

2. A subsea cable insulation medium recovery boot according to claim 1 characterised in that: The lower bin is arranged above the inner cover (12).

3. A subsea cable insulation medium recovery boot according to claim 1 characterised in that: The first supporting leg (14) comprises a first telescopic rod and a first bottom plate, a first connecting seat is fixedly arranged on the first bottom plate, one end of the first telescopic rod is connected with the outer cover (11), the other end of the first telescopic rod is hingedly connected with the first connecting seat, and a ballast (16) is arranged on the upper surface of the first bottom plate.

4. A subsea cable insulation medium recovery boot according to claim 3, characterised in that: One end of the first telescopic rod is detachably connected with the outer cover (11), the side surface of the outer cover (11) is provided with a first supporting leg bolt (15), and the first supporting leg (14) is detachably connected with the first supporting leg bolt (15).

5. The subsea cable insulation medium recovery boot of claim 1, wherein: The outer cover (11) is in the shape of a circular truncated cone.

6. A subsea cable insulation medium modular recovery apparatus for a subsea cable insulation medium recovery cover according to any one of claims 1 to 4, characterised in that: The application further relates to a storage module (2), a sealing collection clamp (3) and a flexible pipe (4), the storage module (2) is provided with at least one recovery port (24), the storage module (2) is connected with a recovery ship through the recovery port (24), the sealing collection clamp (3) and the oil inlet (121) are connected through the flexible pipe (4), the oil outlet (132) and the storage module (2) are connected through the flexible pipe (4), and the sealing collection clamp (3) is used for clamping at a leakage point (51) of a submarine cable (5), so that the insulating medium leaked from the submarine cable (5) can enter the inner cover (12), the layered bin (13) and the storage module (2) in sequence through the flexible pipe (4).

7. A subsea cable insulation medium modular recovery apparatus according to claim 6, characterised in that: The storage module (2) comprises a storage tank (21), the storage tank (21) is provided with an input port (23) and a recovery port (24), a telescopic separation membrane (25) is arranged in the storage tank (21), the telescopic separation membrane (25) is used for balancing the pressure difference between the inside and outside of the storage tank (21), one end of the storage tank (21) is opened and provided with a separation net (26), and the separation net (26) is used for isolating external impurities.

8. A subsea cable insulation medium modular recovery apparatus according to claim 7, characterised in that: The oil storage module (2) comprises a shell (22), the oil storage tank (21) is fixed in the shell (22), a second supporting leg (27) is arranged on the shell (22), the second supporting leg (27) comprises a second telescopic rod and a second bottom plate, a second connecting seat is fixedly arranged on the second bottom plate, one end of the second telescopic rod is connected with the shell (22), the other end of the second telescopic rod is hingedly connected with the second connecting seat, and a ballast (16) is arranged on the upper surface of the second bottom plate.

9. A subsea cable insulation medium modular recovery apparatus according to claim 7, characterised in that: The sealing collection clamp (3) comprises a sealing cylinder, the sealing cylinder comprises two half cylinders which are detachably connected, the two half cylinders are sealingly connected, and the half cylinders are sealingly connected with the submarine cable (5); one of the half cylinders is connected with the flexible pipe (4).

10. A method of recovering insulating medium of a submarine cable according to the modular recovery device of insulating medium of a submarine cable according to any one of claims 6 to 9, characterized in that: Comprise: S1, according to the oil leakage speed and operation and maintenance demand, the number of oil storage modules (2) is determined, the first supporting leg (14) and the second supporting leg (27) are adjusted according to the seabed conditions of the installation point, the oil collection layered module (1) and the oil storage module (2) are hoisted and placed at the pre-installation site, the first supporting leg (14) and the second supporting leg (27) are adjusted again to find the level, and the ballast (16) is placed on the first supporting leg (14) and the second supporting leg (27) to carry out ballast and fixation; S2, the sealing collection clamp (3) is clamped at the leakage point (51) of the submarine cable (5), the sealing collection clamp (3), the submarine cable insulation medium recovery cover and the oil storage module (2) are connected through the flexible pipe (4); S3, the recovery ship injects catalyst and seawater into the layered bin (13) of the submarine cable insulation medium recovery cover through the injection port (133), and at the same time, the ship-borne oil pump is connected to the recovery port (24) of the last oil storage module (2) through the recovery pipeline to collect the insulation medium.

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