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CN-117842546-B - Underwater oil depot tank body and construction method

CN117842546BCN 117842546 BCN117842546 BCN 117842546BCN-117842546-B

Abstract

The underwater oil depot tank body and the construction method thereof provided by the application comprise a soft tank body and low-melting-point alloy materials, wherein the soft tank body is made of flexible materials, the low-melting-point alloy materials can be cast on site, and the soft tank body can be prefabricated and folded in advance, so that the volume is greatly reduced, the low-melting-point alloy materials are injected into an interlayer to play roles of supporting and counterweight, the two materials can be respectively hauled to a preset position in open sea, and the underwater oil depot tank body is formed together through on-site rapid construction, so that the contradiction problem that the traditional tank body is huge and difficult to tow in open sea and the traditional material tank body is difficult to construct in open sea is solved.

Inventors

  • TANG SHOUSHENG
  • WANG LEI
  • DENG ZHONGSHAN
  • LIU JING

Assignees

  • 中国科学院理化技术研究所

Dates

Publication Date
20260512
Application Date
20220930

Claims (12)

  1. 1. The construction method of the underwater oil depot tank body is characterized by comprising a soft tank body and a low-melting-point alloy material, wherein the soft tank body comprises an inner wall and an outer wall, the inner wall and the outer wall form an interlayer, the inner wall and the outer wall are flexible materials, an injection port is formed on the inner wall, at least one feed port and at least one exhaust/liquid port are formed on the interlayer, and the low-melting-point alloy material can be injected into the interlayer through the feed port; the construction method comprises the following steps: Opening the soft tank body, and using compressed air to expand the soft tank body for forming, wherein the soft tank body floats on the sea surface; spraying polyurea on the outer side of the soft tank body to mould the soft tank body; injecting deoxidized water into the interlayer through the feed inlet, and discharging air in the interlayer from the exhaust/liquid port; Injecting a molten low-melting-point alloy material into the interlayer through the feed inlet; The deoxidized water is sequentially discharged from the exhaust/liquid port of the interlayer until the interlayer is filled with the low-melting-point alloy material; injecting seawater from the injection port to cool and shape the shell of the soft tank body, controlling the injection amount of the seawater, and keeping the upper part of the soft tank body above the seawater surface so as to finish the subsequent construction.
  2. 2. The method of constructing an underwater oil reservoir tank of claim 1, wherein the flexible material comprises aramid fibers.
  3. 3. The method for constructing an underwater oil depot tank according to claim 1, wherein the melting point of the low melting point alloy material is 70-90 ℃.
  4. 4. A method of constructing an underwater oil reservoir tank as claimed in claim 3, wherein the low melting point alloy material comprises a ternary alloy or a quaternary alloy consisting of bismuth, indium, tin, lead, the ternary alloy or quaternary alloy further being added with at least one of zinc or copper or carbon.
  5. 5. The method for constructing an underwater oil reservoir tank as claimed in claim 4, wherein the low melting point alloy material comprises elements of 30 to 60mass% bismuth, 1 to 30mass% indium, 10 to 20mass% tin, 10 to 35mass% lead and the balance zinc or copper or carbon.
  6. 6. The method for constructing an underwater oil reservoir tank according to claim 4, wherein the ternary alloy comprises the following components Bi: in: sn-57:26:17 and the balance of zinc, and the quaternary alloy comprises the following components Bi: in: sn: pb-49:21:12:18 and the balance of zinc.
  7. 7. The method of constructing an underwater oil reservoir tank as claimed in claim 1, wherein the low melting point alloy material has a density of 8-10g/ml.
  8. 8. The construction method of the tank body of the underwater oil depot according to claim 1, wherein the inner side of the interlayer is coated with an electric heating wire and a plurality of temperature measuring devices are arranged.
  9. 9. The method of constructing an underwater oil depot tank of claim 1, wherein the interlayer has a thickness of between 10 and 500 mm.
  10. 10. The construction method of an underwater oil depot tank according to claim 1, wherein in the step of injecting deoxidized water into the interlayer through the feed inlet and discharging air in the interlayer from the exhaust/liquid outlet, the method further comprises the step of continuously heating by using a heating wire attached to the inner wall of the interlayer, so as to ensure that the deoxidized water temperature is maintained at 90-95 ℃.
  11. 11. The method of constructing an underwater oil reservoir tank as claimed in claim 1, further comprising, in the step of injecting the low melting point alloy material in a molten state into the interlayer through the feed port, driving with hot nitrogen gas to inject the low melting point alloy material into the interlayer through the feed port.
  12. 12. The method for constructing an underwater oil tank as claimed in claim 1, further comprising the step of heating the low melting point alloy material to make the low melting point alloy material in a molten state, before the step of injecting the low melting point alloy material in a molten state into the interlayer through the feed port.

Description

Underwater oil depot tank body and construction method Technical Field The application relates to the technical field of oil and gas storage and transportation, in particular to an underwater oil depot tank body and a construction method. Background There are three ways of offshore oil storage, water surface oil storage and underwater oil storage. The former two methods are mature, but the cost of the water oil storage platform is very high, the oil storage capacity cannot be too large due to the limitation of the bearing capacity of the supporting structure, and the water oil storage is greatly influenced by external storms, ocean currents, ice and the like. In contrast, the underwater oil storage has many advantages, and has been successfully applied abroad, because the oil storage tank is positioned under the water surface and isolated from fire sources and lightning, the oil gas loss is small, the oil gas loss has natural explosion-proof performance, meanwhile, the influence of wave force is avoided, the tank capacity is not limited, and the oil storage tank has huge oil storage capacity. Conventional underwater storage tank shells are typically constructed on land using prestressed reinforced concrete or stainless steel and then towed to a predetermined sea location for filling submerged, which is relatively easy to achieve offshore. The current oil field development is developing to deep sea and open sea, and the predetermined sea area is far away from the continent, so that the storage tank is huge, the towing cost is too high to be feasible, and the towing process faces a complex severe offshore environment, so that the safety risk exists. The sea area of China is wide, and especially, the south sea has a plurality of islands far away from oil ports, the oil supply cost is high and time is wasted, if an underwater oil depot is built near the islands, the living and training of stationed on the island army or the supply requirement of ocean fishing vessels can be met at ordinary times, the mobile transfer can be realized in the war, the fuel can be supplied for first-line vessels/fighters, and the working radius is greatly enlarged. Therefore, a material and a construction process which not only meet the strength requirement, but also can be constructed on site are required to be developed so as to meet the construction requirements of an open sea underwater oil depot. Disclosure of Invention In view of this, it is necessary to provide a tank and a construction method which can be constructed on a large scale in open sea, against the defects of the prior art that the conventional tank is huge and difficult to tow in open sea and the conventional material tank is difficult to construct on the open sea. In order to solve the problems, the application adopts the following technical scheme: the application provides an underwater oil depot tank body, which comprises a soft tank body and a low-melting-point alloy material, wherein the soft tank body comprises an inner wall and an outer wall, the inner wall and the outer wall form an interlayer, the inner wall and the outer wall are made of flexible materials, an injection opening is formed in the inner wall, at least one feed inlet and at least one exhaust/liquid opening are formed in the interlayer, and the low-melting-point alloy material can be injected into the interlayer through the feed inlet. In some of these embodiments, the flexible material comprises an aramid fiber comprising a kevlar series. In some embodiments, the melting point of the low melting point alloy material is between 70 ℃ and 90 ℃. In some of these embodiments, the low melting point alloy material comprises a ternary or quaternary alloy consisting of bismuth, indium, tin, lead, with the addition of at least one of zinc or copper or carbon. In some of these embodiments, the low melting point alloy material includes elements having a bismuth content of 30-60mass%, an indium content of 1-30 mass%, a tin content of 10-20mass%, a lead content of 10-35mass%, and the balance zinc or copper or carbon. In some embodiments, the ternary alloy comprises the following components Bi: in: sn-57:26:17 and is doped with the balance of zinc, and the quaternary alloy comprises the following components Bi: in: sn: pb-49:21:12:18 and is doped with the balance of zinc. In some of these embodiments, the low melting point alloy material has a density of 8-10g/ml. In some embodiments, an electric heating wire is attached to the inner side of the interlayer, and a plurality of temperature measuring devices are arranged. In some of these embodiments, the interlayer has a thickness of between 10-500 mm. In some embodiments, the outside of the soft can is also sprayed with polyurea. The second object of the application is to provide a construction method of the tank body of the underwater oil depot, which comprises the following steps: opening the soft tank body to enable the soft tank body to be swelled and f