A sensing optical cable used in deep water and its preparation method

Abstract

The present invention relates to the field of optical cable technology, and in particular to a sensing optical cable used in deep water and a preparation method thereof. The present invention comprises: an embedded optical fiber grating pressure sensor; a loose tube layer; an inner sheath layer; an inner armor layer; an outer sheath layer, an oleophilic cracking layer; an outer armor layer; a corrosion-resistant water-blocking and oil-permeable layer; wherein the oleophilic cracking layer is composed of an oleophilic cracking material, and is coated on the outer sheath with a thickness of 0.5-0.6 mm, and the corrosion-resistant water-blocking and oil-permeable layer is composed of a corrosion-resistant water-blocking and oil-permeable material, and is coated on the outer armor layer with a thickness of 0.6-0.8 mm. When the sensing optical cable used in deep water of the present invention is applied to an oil pipeline of an oil well drilling, it can stably and quickly monitor the oil leakage and oil leakage point of the oil pipeline while avoiding interference from external factors, and has excellent seawater corrosion resistance and deepwater pressure resistance.

Description

Technical Field

[0001] The present invention relates to the field of optical cable technology, and in particular to a sensing optical cable used in deep water and a preparation method thereof. Background Art

[0002] During the oil drilling process, oil pipeline leakage is a long-standing challenge. Oil pipelines are often laid on the seabed or in deepwater environments. Due to external pressure, temperature fluctuations, corrosion and other factors, pipelines are prone to damage or aging, leading to oil leakage. Oil leakage not only causes waste of resources, but may also cause serious pollution to the environment, especially in marine ecosystems. The consequences of oil leakage are very serious. Therefore, how to quickly detect oil leaks and accurately locate the leak has become a technical problem that needs to be urgently solved in the oil and gas transportation industry.

[0003] A sensor cable is a fiber optic cable that integrates sensor technology. It is usually used to detect and monitor various physical parameters (such as temperature, pressure, stress, etc.). It uses optical fiber as a sensing medium and fiber grating technology to reflect the impact of changes in the external environment on the optical fiber in real time and convert these changes into measurable optical signals. In the oil industry, especially in deepwater oil pipeline oil leak detection, sensor cables, as a high-precision and high-stability monitoring technology, can provide a more accurate and real-time solution for oil leak detection.

[0004] The existing technical means for using pressure sensing optical cables to detect oil pipeline leaks often involves absorbing the leaked oil through the optical cable, causing the internal material to expand and thereby increasing the internal pressure of the optical cable, thereby squeezing the pressure sensor inside the sensing optical cable, and then converting the pressure increase into an electrical signal for oil leak detection. Although it is capable of quickly detecting oil leaks, when applied to offshore oil wells, the drilling rigs and pumping units of the offshore oil wells often generate large vibrations, which can easily cause the sensing optical cable to be subjected to external forces, thereby squeezing the pressure sensor inside the sensing optical cable, and then falsely triggering the oil leak detection system. The stability of oil leak detection is poor, which can easily lead to a waste of human resources. Summary of the invention

[0005] The purpose of the present invention is to provide a sensing optical cable for use in deep water and a preparation method thereof. When applied to an oil pipeline in oil drilling, the sensing optical cable can stably and quickly monitor the oil leakage and oil leakage points of the oil pipeline without interference from external factors, and has excellent resistance to seawater corrosion and vibration and pressure resistance.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a sensing optical cable for use in deep water, comprising:

[0008] An embedded fiber Bragg grating pressure sensor, which is composed of an optical fiber, a grating arrayed on the optical fiber, and a sensitizing material covering the fiber Bragg grating, and is set to emit an electrical signal only when the pressure decreases below a threshold value;

[0009] A loose tube layer, which covers the embedded fiber grating pressure sensor, and the loose tube layer is composed of a stainless steel material and has a thickness of 0.38-0.5 mm;

[0010] An inner sheath layer, which covers the loose sheath layer, and the inner sheath layer is made of high-density polyethylene material and has a thickness of 0.9-1 mm;

[0011] An inner armor layer, which covers the inner sheath layer, and the inner armor layer is a fine steel wire armor with a thickness of 1-1.5 mm;

[0012] An outer sheath layer covers the inner armor layer, and the outer sheath layer is made of high-density polyethylene material with a thickness of 0.3-0.5 mm;

[0013] An oleophilic cracking layer covers the outer sheath layer, the oleophilic cracking layer is composed of an oleophilic cracking material and has a thickness of 0.5-0.6 mm;

[0014] An outer armor layer, which covers the above-mentioned oleophilic cracking layer, and the outer armor layer is a thick steel wire armor with a thickness of 5-10mm;

[0015] The corrosion-resistant, water-blocking and oil-permeable layer covers the outer armor layer. The corrosion-resistant, water-blocking and oil-permeable layer is composed of corrosion-resistant, water-blocking and oil-permeable materials and has a thickness of 0.6-0.8mm.

[0016] Another aspect of the present invention provides a method for preparing the above-mentioned sensor optical cable for use in deep water, comprising the following steps:

[0017] S1: Preparation of lipophilic cracking material, S1.1: Mix trihydroxy polyoxypropylene ether and hexamethylene diisocyanate in a molar ratio of 1: (0.6-0.8) in a container, and react at a constant temperature of 80-100°C for 4-5 hours under mechanical stirring, and then add 4-5 times the weight of toluene at room temperature after standing for 6-8 hours, and filter after stirring for 25-30 minutes, rinse with deionized water, and dry at 60-65°C to obtain a polyurethane matrix;

[0018] S1.2: placing a polyurethane matrix and n-octadecyl mercaptan in a container at a molar ratio of isocyanate group to thiol functional group of 1:(0.95-1), adding 4-chlorobenzophenone with a mass fraction of 1-1.5%, and then irradiating with ultraviolet light under magnetic stirring for 2-2.5 hours to obtain a chain-extended polyurethane matrix;

[0019] S1.3: 4-5 parts by weight of extended chain polyurethane matrix, 3-4 parts by weight of beeswax, 0.8-1 parts by weight of magnolol, 1-2 parts by weight of polyvinyl alcohol fiber and 1-2 parts by weight of boron-doped carbon nanotubes are stirred and evenly mixed, and then placed in a vacuum degassing machine for vacuum degassing, and then reacted at 80-82°C for 2-3 hours to obtain a lipophilic cracking material.

[0020] S2: Preparation of corrosion-resistant, water-blocking and oil-permeable materials, S2.1: After cleaning the quartz sand powder with clean water, soak it in a sodium hydroxide solution with a mass fraction of 10-15% and a hydrochloric acid solution with a mass fraction of 10-15% in sequence, soaking for 45-60 minutes respectively, after soaking in the sodium hydroxide solution and the hydrochloric acid solution, rinse the quartz sand powder with clean water until the clean water after rinsing is neutral, and then put it into an oven for drying to obtain clean quartz sand powder;

[0021] S2.2: Dopamine is placed in a container, and a Tris-HCl solution is added and stirred until dopamine is completely dissolved to prepare a dopamine solution with a concentration of 2.5-3 mg / mL. 8-10 parts by weight of clean quartz sand powder and 60-100 parts by weight of Tris-HCl solution are mixed and placed in a container, and stirred evenly at a stirring speed of 1000-1200 rpm to obtain a quartz sand powder dispersion. The quartz sand powder dispersion is then poured into 400-500 parts by weight of the dopamine solution while stirring at a stirring speed of 120-150 rpm, and then stirred for 8-10 hours. After filtering, the mixture is rinsed with deionized water for 3-4 times, and then dried in an oven at 60-65°C for 4-5 hours to obtain PDA-modified quartz sand powder, which is placed in a high-pressure reactor for reaction;

[0022] S2.3: NiSO 4 6H 2 O and Ti (SO 4 ) 2 Dissolve in deionized water according to a molar ratio of 1:(2-3) to prepare a mixed salt solution, add urea with the same molar mass as the metal ion to the mixed salt solution, stir magnetically for 2-2.5 hours, add to a high-pressure reactor containing PDA-modified quartz sand powder to completely immerse the PDA-modified quartz sand powder, and then react at a hydrothermal temperature of 120-130°C for 12-15 hours, rinse with deionized water after taking out, and then dry in an oven at 60-65°C for 4-5 hours to obtain titanium nickel hydroxide-coated quartz sand powder;

[0023] S2.4: Take 12-15 parts by weight of pure water, add 1.5-2 parts by weight of polyacrylamide and 0.04-0.06 parts by weight of hexadecyltriethoxysilane in sequence at a stirring speed of 800-850rpm, stir for 10-15 minutes, then add 8-10 parts by weight of titanium nickel hydroxide coated quartz sand powder, stir thoroughly and evenly to obtain a corrosion-resistant, water-blocking and oil-permeable material.

[0024] S3: extrusion and compounding of sensing optical cable, S3.1: a loose tube layer with a thickness of 0.38-0.5 mm is mounted on the outer surface of the embedded fiber grating pressure sensor, the loose tube layer is made of stainless steel material, and then a layer of inner sheath layer with a thickness of 0.9-1 mm is extruded on the surface of the loose tube layer, the inner sheath layer is made of high-density polyethylene material, and an inner armor layer with a thickness of 1-1.5 mm is mounted on the outside of the inner sheath layer, the inner armor layer is fine steel wire armor, and an inner optical cable is obtained;

[0025] S3.2: An outer sheath layer with a thickness of 0.3-0.5mm is extruded on the surface of the inner optical cable, and the outer sheath layer is composed of a high-density polyethylene material. Then, a oleophilic cracking layer with a thickness of 0.5-0.6mm is extruded on the surface of the outer sheath layer. The oleophilic cracking layer is composed of the oleophilic cracking material obtained in step S1.3. Then, an outer armor layer with a thickness of 5-10mm is applied to the outside of the oleophilic cracking layer. The outer armor layer applies pressure inward to the oleophilic cracking layer, and the outer armor layer is a coarse steel wire armor. Finally, the corrosion-resistant, water-blocking and oil-permeable material obtained in step S2.4 is extruded on the outer surface of the outer armor layer to form a corrosion-resistant, water-blocking and oil-permeable layer with a thickness of 0.6-0.8mm, thereby obtaining a sensing optical cable for use in deep water.

[0026] Furthermore, in step S1.2, the wavelength of the ultraviolet light is 275-280 nm, and the irradiation amount is 20-25 mW / cm 2 .

[0027] Furthermore, the concentration of the Tris-HCl solution added to dopamine in step S2.2 is 10 mM and the pH is 8-8.5.

[0028] Further, in step S2.3, NiSO 4 6H 2 O, Ti (SO 4 ) 2 The concentration of the mixed salt solution prepared with deionized water is 0.2-0.3 mol / L.

[0029] Furthermore, the high-density polyethylene materials in step S3 are all HDPE DMDA-8008H.

[0030] The beneficial effects are as follows: 1. The present invention sets a loose sleeve layer on the outer surface of the embedded fiber grating pressure sensor, and then fixes it by extrusion and sets an inner sheath layer and an inner armor layer to play a protective and supporting role, thereby obtaining an inner optical cable, and then sequentially extrudes an outer sheath layer, an oleophilic cracking layer, an outer armor layer and a corrosion-resistant water-blocking and oil-permeable layer on the outside of the inner optical cable, the outer armor layer applies pressure inward to the oleophilic cracking layer, and fixes the oleophilic cracking layer, the outermost corrosion-resistant water-blocking and oil-permeable layer has high water resistance and high oil permeability, and the prepared sensor optical cable is fixed on the oil pipeline, which can prevent leakage of the damaged oil pipeline while waterproofing it. The leaked oil enters the outer optical cable, and the oil is absorbed by the oleophilic cracking layer through the outer armor layer. Then the main component of beeswax in the oleophilic cracking layer will be dissolved under the action of petroleum ether, kerosene and organic solvents in the oil, and gaps will appear between the optical cables, reducing the pressure applied inward by the outer armor layer, thereby reducing the pressure applied to the embedded fiber grating pressure sensor. When the pressure decreases below the threshold, the refractive index of the optical fiber changes, and the sensor sends a signal, realizing rapid detection and rapid positioning of oil leaks. The setting of sending a signal only when the pressure decreases below the threshold also avoids false triggering caused by adverse factors such as vibration.

[0031] 2. The present invention first prepares a dopamine solution and coats a layer of polydopamine on the surface of clean quartz sand powder to obtain PDA-modified quartz sand powder, and then passes NiSO 4 6H 2 O and Ti (SO 4 ) 2 A double layer of nickel and titanium metal hydroxide is deposited on the surface by in-situ deposition, and then mixed with a suspending agent polyacrylamide and a hydrophobic agent hexadecyltriethoxysilane to obtain a corrosion-resistant, water-blocking and oil-permeable material. The quartz sand powder not only provides excellent compressive performance, but also the nickel and titanium double layer of metal hydroxide can greatly enhance the corrosion resistance of the corrosion-resistant, water-blocking and oil-permeable material to seawater. It also has good super-hydrophobic and super-oleophilic properties, which can extend the service life while allowing the leaked oil to better enter the optical cable, thereby triggering the fiber grating pressure sensor sensing more quickly and realizing rapid detection of oil leakage.

[0032] 3. The present invention prepares a polyurethane matrix by using trihydroxy polyoxypropylene ether and hexamethylene diisocyanate, and carries out a chain extension reaction with the mercaptan of n-octadecyl sulfur to obtain an extended chain polyurethane matrix. The side chain crystals introduced by n-octadecyl sulfur can react with magnolol and beeswax to achieve cross-linking and curing in the subsequent reaction. Under the synergistic effect of the extended chain polyurethane matrix and magnolol, a cross-linking network is formed with beeswax, which promotes the combination of the polyurethane matrix and beeswax. The obtained oleophilic cracking material has high stability, and the introduction of oleophilic component-doped boron carbon nanotubes can not only improve the absorption of leaked oil by the oleophilic cracking layer prepared by the oleophilic cracking material, but also enhance the vibration resistance of the oleophilic cracking layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the sensing optical cable described in the present invention.

[0034] In the figure: 1-embedded fiber Bragg grating pressure sensor; 2-loose tube layer; 3-inner sheath layer; 4-inner armor layer; 5-outer sheath layer; 6-oleophilic cracking layer; 7-outer armor layer; 8-corrosion-resistant, water-blocking and oil-permeable layer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1, a sensor optical cable used in deep water, such as Figure 1 As shown, including:

[0037] The embedded fiber Bragg grating pressure sensor 1 is composed of an optical fiber, a grating arrayed on the optical fiber, and polycarbonate coating the fiber Bragg grating, and is set to emit an electrical signal only when the pressure decreases below a threshold value;

[0038] A loose tube layer 2, which covers the embedded fiber Bragg grating pressure sensor 1, and the loose tube layer 2 is made of stainless steel material with a thickness of 0.38 mm;

[0039] An inner sheath layer 3, which covers the loose tube layer 2, and the inner sheath layer 3 is composed of a high-density polyethylene material HDPE DMDA-8008H, and has a thickness of 0.9 mm;

[0040] An inner armor layer 4, which covers the inner sheath layer 3, and the inner armor layer 4 is a fine steel wire armor with a thickness of 1 mm;

[0041] An outer sheath layer 5, which covers the inner armor layer 4, and the outer sheath layer 5 is made of high-density polyethylene material HDPE DMDA-8008H, with a thickness of 0.3 mm;

[0042] The oleophilic cracking layer 6 covers the outer sheath layer 5, and the oleophilic cracking layer 6 is composed of an oleophilic cracking material and has a thickness of 0.5 mm;

[0043] An outer armor layer 7, which covers the above-mentioned oleophilic cracking layer 6, and the outer armor layer 7 is a thick steel wire armor with a thickness of 5mm;

[0044] The corrosion-resistant, water-blocking and oil-permeable layer 8 covers the outer armor layer 7. The corrosion-resistant, water-blocking and oil-permeable layer 8 is made of a corrosion-resistant, water-blocking and oil-permeable material and has a thickness of 0.6 mm.

[0045] A method for preparing a sensing optical cable for use in deep water comprises the following steps:

[0046] S1: Preparation of lipophilic cracking material, S1.1: trihydroxy polyoxypropylene ether and hexamethylene diisocyanate are mixed in a molar ratio of 1:0.6 in a container, and reacted at 80°C for 4 hours under mechanical stirring. After standing for 6 hours, 4 times the weight of toluene is added at room temperature, stirred for 25 minutes, filtered, rinsed with deionized water, and dried at 60°C to obtain a polyurethane matrix;

[0047] S1.2: A polyurethane matrix and n-octadecyl mercaptan were placed in a container at a molar ratio of 1:0.95 between the isocyanate group and the thiol group, 1% by mass of 4-chlorobenzophenone was added, and then the irradiation was performed at a wavelength of 275 nm and an irradiation dose of 20 mW / cm under magnetic stirring. 2 The ultraviolet light was irradiated for 2 hours to obtain a chain-extended polyurethane matrix;

[0048] S1.3: 4 parts by weight of extended chain polyurethane matrix, 3 parts by weight of beeswax, 0.8 parts by weight of magnolol, 1 part by weight of polyvinyl alcohol fiber and 1 part by weight of boron-doped carbon nanotubes are stirred and evenly mixed, and then placed in a vacuum degassing machine for vacuum degassing, and then reacted at 80°C for 2 hours to obtain a lipophilic cracking material.

[0049] S2: Preparation of corrosion-resistant, water-blocking and oil-permeable materials, S2.1: After cleaning the quartz sand powder with clean water, soak it in a 10% by mass sodium hydroxide solution and a 10% by mass hydrochloric acid solution in turn, soaking for 45 minutes respectively, after soaking in the sodium hydroxide solution and the hydrochloric acid solution, rinse the quartz sand powder with clean water until the clean water after rinsing is neutral, and then put it into an oven for drying to obtain clean quartz sand powder;

[0050] S2.2: Dopamine is placed in a container, and a Tris-HCl solution with a concentration of 10 mM and a pH of 8 is added and stirred until dopamine is completely dissolved to prepare a dopamine solution with a concentration of 2.5 mg / mL. 8 parts by weight of clean quartz sand powder and 60 parts by weight of Tris-HCl solution are mixed and placed in a container, and stirred evenly at a stirring speed of 1000 rpm to obtain a quartz sand powder dispersion. The quartz sand powder dispersion is then poured into 400 parts by weight of the dopamine solution while stirring at a stirring speed of 120 rpm, and then stirred for another 8 hours. After filtering, the mixture is rinsed with deionized water for 3 times, and then dried in an oven at 60°C for 4 hours to obtain PDA-modified quartz sand powder, which is placed in a high-pressure reactor for reaction;

[0051] S2.3: NiSO 4 6H 2 O and Ti (SO4 ) 2 Dissolve in deionized water at a molar ratio of 1:2 to prepare a mixed salt solution with a concentration of 0.2 mol / L, add urea with the same molar mass as the metal ion to the mixed salt solution, add to the high-pressure reactor containing PDA-modified quartz sand powder after magnetic stirring for 2 hours, so that the PDA-modified quartz sand powder is completely immersed, and then react at a hydrothermal temperature of 120°C for 12 hours, rinse with deionized water after taking out, and then place in an oven at 60°C for 4 hours to obtain titanium nickel hydroxide coated quartz sand powder;

[0052] S2.4: Take 12 parts by weight of pure water, add 1.5 parts by weight of polyacrylamide and 0.04 parts by weight of hexadecyltriethoxysilane in sequence at a stirring speed of 800 rpm, stir for 10 minutes, then add 8 parts by weight of titanium nickel hydroxide-coated quartz sand powder, stir thoroughly and evenly to obtain a corrosion-resistant, water-blocking and oil-permeable material.

[0053] S3: extrusion and compounding of sensing optical cable, S3.1: a loose tube layer 2 with a thickness of 0.38 mm is mounted on the outer surface of the embedded fiber grating pressure sensor 1, the loose tube layer 2 is made of stainless steel material, and then a layer of inner sheath layer 3 with a thickness of 0.9 mm is extruded on the surface of the loose tube layer 2, the inner sheath layer 3 is made of high-density polyethylene material HDPE DMDA-8008H, and an inner armor layer 4 with a thickness of 1 mm is mounted on the outside of the inner sheath layer, the inner armor layer 4 is a fine steel wire armor, and an inner layer optical cable is obtained;

[0054] S3.2: An outer sheath layer 5 with a thickness of 0.3 mm is extruded on the surface of the inner optical cable, and the outer sheath layer 5 is composed of a high-density polyethylene material HDPE DMDA-8008H. Then, a oleophilic cracking layer 6 with a thickness of 0.5 mm is extruded on the surface of the outer sheath layer 5. The oleophilic cracking layer 6 is composed of the oleophilic cracking material obtained in step S1.3. Then, an outer armor layer 7 with a thickness of 5 mm is set on the outside of the oleophilic cracking layer 6. The outer armor layer 7 applies pressure inward to the oleophilic cracking layer 6. The outer armor layer 7 is a coarse steel wire armor. Finally, the corrosion-resistant, water-blocking and oil-permeable material obtained in step S2.4 is extruded on the outer surface of the outer armor layer to form a corrosion-resistant, water-blocking and oil-permeable layer 8 with a thickness of 0.6 mm, thereby obtaining a sensing optical cable for use in deep water.

[0055] Embodiment 2, a sensor optical cable used in deep water, such as Figure 1 As shown, including:

[0056] The embedded fiber Bragg grating pressure sensor 1 is composed of an optical fiber, a grating arrayed on the optical fiber, and polycarbonate coating the fiber Bragg grating, and is set to emit an electrical signal only when the pressure decreases below a threshold value;

[0057] A loose tube layer 2, which covers the embedded fiber Bragg grating pressure sensor 1, and the loose tube layer 2 is made of stainless steel material with a thickness of 0.38 mm;

[0058] An inner sheath layer 3, which covers the loose tube layer 2, and the inner sheath layer 3 is composed of a high-density polyethylene material HDPE DMDA-8008H, and has a thickness of 0.9 mm;

[0059] An inner armor layer 4, which covers the inner sheath layer 3, and the inner armor layer 4 is a fine steel wire armor with a thickness of 1 mm;

[0060] An outer sheath layer 5, which covers the inner armor layer 4, and the outer sheath layer 5 is made of high-density polyethylene material HDPE DMDA-8008H, with a thickness of 0.3 mm;

[0061] The oleophilic cracking layer 6 covers the outer sheath layer 5, and the oleophilic cracking layer 6 is composed of an oleophilic cracking material and has a thickness of 0.5 mm;

[0062] An outer armor layer 7, which covers the above-mentioned oleophilic cracking layer 6, and the outer armor layer 7 is a thick steel wire armor with a thickness of 5mm;

[0063] The corrosion-resistant, water-blocking and oil-permeable layer 8 covers the outer armor layer 7. The corrosion-resistant, water-blocking and oil-permeable layer 8 is made of a corrosion-resistant, water-blocking and oil-permeable material and has a thickness of 0.6 mm.

[0064] A method for preparing a sensing optical cable for use in deep water comprises the following steps:

[0065] S1: Preparation of lipophilic cracking material, S1.1: trihydroxy polyoxypropylene ether and hexamethylene diisocyanate are mixed in a molar ratio of 1:0.8 in a container, and reacted at 80°C for 4 hours under mechanical stirring. After standing for 6 hours, 5 times the weight of toluene is added at room temperature, stirred for 25 minutes, filtered, rinsed with deionized water, and dried at 60°C to obtain a polyurethane matrix;

[0066] S1.2: A polyurethane matrix and n-octadecyl mercaptan were placed in a container at a molar ratio of 1:1 between the isocyanate group and the thiol group, 1.5% by mass of 4-chlorobenzophenone was added, and then the irradiation was carried out at a wavelength of 275 nm and an irradiation dose of 20 mW / cm under magnetic stirring. 2 The ultraviolet light was irradiated for 2 hours to obtain a chain-extended polyurethane matrix;

[0067] S1.3: 5 parts by weight of extended chain polyurethane matrix, 4 parts by weight of beeswax, 1 part by weight of magnolol, 2 parts by weight of polyvinyl alcohol fiber and 2 parts by weight of boron-doped carbon nanotubes are stirred and evenly mixed, and then placed in a vacuum degassing machine for vacuum degassing, and then reacted at 80°C for 2 hours to obtain a lipophilic cracking material.

[0068] S2: Preparation of corrosion-resistant, water-blocking and oil-permeable materials, S2.1: After cleaning the quartz sand powder with clean water, soak it in a 10% by mass sodium hydroxide solution and a 10% by mass hydrochloric acid solution in turn, soaking for 45 minutes respectively, after soaking in the sodium hydroxide solution and the hydrochloric acid solution, rinse the quartz sand powder with clean water until the clean water after rinsing is neutral, and then put it into an oven for drying to obtain clean quartz sand powder;

[0069] S2.2: Dopamine is placed in a container, and a Tris-HCl solution with a concentration of 10 mM and a pH of 8 is added and stirred until dopamine is completely dissolved to prepare a dopamine solution with a concentration of 2.5 mg / mL. 10 parts by weight of clean quartz sand powder and 100 parts by weight of Tris-HCl solution are mixed and placed in a container, and stirred evenly at a stirring speed of 1000 rpm to obtain a quartz sand powder dispersion. The quartz sand powder dispersion is then poured into 500 parts by weight of the dopamine solution while stirring at a stirring speed of 120 rpm, and then stirred for another 8 hours. After filtering, the mixture is rinsed with deionized water for 3 times, and then dried in an oven at 60°C for 4 hours to obtain PDA-modified quartz sand powder, which is placed in a high-pressure reactor for reaction;

[0070] S2.3: NiSO 4 6H 2 O and Ti (SO 4 ) 2 Dissolve in deionized water at a molar ratio of 1:3 to prepare a mixed salt solution with a concentration of 0.2 mol / L, add urea with the same molar mass as the metal ion to the mixed salt solution, add to the high-pressure reactor containing PDA-modified quartz sand powder after magnetic stirring for 2 hours, so that the PDA-modified quartz sand powder is completely immersed, and then react at a hydrothermal temperature of 120° C. for 12 hours, rinse with deionized water after taking out, and then place in an oven at 60° C. for 4 hours to obtain titanium nickel hydroxide coated quartz sand powder;

[0071] S2.4: Take 15 parts by weight of pure water, add 2 parts by weight of polyacrylamide and 0.06 parts by weight of hexadecyltriethoxysilane in sequence at a stirring speed of 800 rpm, stir for 10 minutes, then add 10 parts by weight of titanium nickel hydroxide-coated quartz sand powder, stir well to obtain a corrosion-resistant, water-blocking and oil-permeable material.

[0072] S3: extrusion and compounding of sensing optical cable, S3.1: a loose tube layer 2 with a thickness of 0.38 mm is mounted on the outer surface of the embedded fiber grating pressure sensor 1, the loose tube layer 2 is made of stainless steel material, and then a layer of inner sheath layer 3 with a thickness of 0.9 mm is extruded on the surface of the loose tube layer 2, the inner sheath layer 3 is made of high-density polyethylene material HDPE DMDA-8008H, and an inner armor layer 4 with a thickness of 1 mm is mounted on the outside of the inner sheath layer, the inner armor layer 4 is a fine steel wire armor, and an inner layer optical cable is obtained;

[0073] S3.2: An outer sheath layer 5 with a thickness of 0.3 mm is extruded on the surface of the inner optical cable, and the outer sheath layer 5 is composed of a high-density polyethylene material HDPE DMDA-8008H. Then, a oleophilic cracking layer 6 with a thickness of 0.5 mm is extruded on the surface of the outer sheath layer 5. The oleophilic cracking layer 6 is composed of the oleophilic cracking material obtained in step S1.3. Then, an outer armor layer 7 with a thickness of 5 mm is set on the outside of the oleophilic cracking layer 6. The outer armor layer 7 applies pressure inward to the oleophilic cracking layer 6. The outer armor layer 7 is a coarse steel wire armor. Finally, the corrosion-resistant, water-blocking and oil-permeable material obtained in step S2.4 is extruded on the outer surface of the outer armor layer to form a corrosion-resistant, water-blocking and oil-permeable layer 8 with a thickness of 0.6 mm, thereby obtaining a sensing optical cable for use in deep water.

[0074] Embodiment 3, a sensor optical cable used in deep water, such as Figure 1 As shown, including:

[0075] The embedded fiber Bragg grating pressure sensor 1 is composed of an optical fiber, a grating arrayed on the optical fiber, and polycarbonate coating the fiber Bragg grating, and is set to emit an electrical signal only when the pressure decreases below a threshold value;

[0076] A loose tube layer 2, which covers the embedded fiber grating pressure sensor 1, and the loose tube layer 2 is made of stainless steel material with a thickness of 0.5 mm;

[0077] An inner sheath layer 3, which covers the loose tube layer 2, and the inner sheath layer 3 is composed of a high-density polyethylene material HDPE DMDA-8008H, and has a thickness of 1 mm;

[0078] An inner armor layer 4, which covers the inner sheath layer 3, and the inner armor layer 4 is a fine steel wire armor with a thickness of 1.5 mm;

[0079] An outer sheath layer 5, which covers the inner armor layer 4, and the outer sheath layer 5 is made of high-density polyethylene material HDPE DMDA-8008H, with a thickness of 0.5 mm;

[0080] The oleophilic cracking layer 6 covers the outer sheath layer 5, and the oleophilic cracking layer 6 is composed of an oleophilic cracking material and has a thickness of 0.6 mm;

[0081] An outer armor layer 7, which covers the above-mentioned oleophilic cracking layer 6, and the outer armor layer 7 is a thick steel wire armor with a thickness of 10 mm;

[0082] The corrosion-resistant, water-blocking and oil-permeable layer 8 covers the outer armor layer 7. The corrosion-resistant, water-blocking and oil-permeable layer 8 is made of a corrosion-resistant, water-blocking and oil-permeable material and has a thickness of 0.8 mm.

[0083] A method for preparing a sensing optical cable for use in deep water comprises the following steps:

[0084] S1: Preparation of lipophilic cracking material, S1.1: trihydroxy polyoxypropylene ether and hexamethylene diisocyanate are mixed in a molar ratio of 1:0.6 in a container, and reacted at 100°C for 5 hours under mechanical stirring, and then 4 times the weight of toluene is added at room temperature after standing for 8 hours, and filtered after stirring for 30 minutes, rinsed with deionized water and dried at 65°C to obtain a polyurethane matrix;

[0085] S1.2: A polyurethane matrix and n-octadecyl mercaptan were placed in a container at a molar ratio of 1:0.95 between the isocyanate group and the thiol group, 1% by mass of 4-chlorobenzophenone was added, and then the irradiation was carried out at a wavelength of 280 nm and an irradiation dose of 25 mW / cm under magnetic stirring. 2 The ultraviolet light was irradiated for 2 hours to obtain a chain-extended polyurethane matrix;

[0086] S1.3: 4 parts by weight of extended chain polyurethane matrix, 3 parts by weight of beeswax, 0.8 parts by weight of magnolol, 1 part by weight of polyvinyl alcohol fiber and 1 part by weight of boron-doped carbon nanotubes are stirred and evenly mixed, and then placed in a vacuum degassing machine for vacuum degassing, and then reacted at 82°C for 3 hours to obtain a lipophilic cracking material.

[0087] S2: Preparation of corrosion-resistant, water-blocking and oil-permeable materials, S2.1: After cleaning the quartz sand powder with clean water, soak it in a 15% by mass sodium hydroxide solution and a 15% by mass hydrochloric acid solution in turn, soaking for 60 minutes respectively, after soaking in the sodium hydroxide solution and the hydrochloric acid solution, rinse the quartz sand powder with clean water until the clean water after rinsing is neutral, and then put it into an oven for drying to obtain clean quartz sand powder;

[0088] S2.2: Dopamine is placed in a container, and a Tris-HCl solution with a concentration of 10 mM and a pH of 8.5 is added and stirred until dopamine is completely dissolved to prepare a dopamine solution with a concentration of 3 mg / mL. 8 parts by weight of clean quartz sand powder and 60 parts by weight of Tris-HCl solution are mixed and placed in a container, and stirred evenly at a stirring speed of 1200 rpm to obtain a quartz sand powder dispersion. The quartz sand powder dispersion is then poured into 400 parts by weight of the dopamine solution while stirring at a stirring speed of 150 rpm, and then stirred for 10 hours. After filtering, the mixture is rinsed with deionized water for 4 times, and then dried in an oven at 65°C for 5 hours to obtain PDA-modified quartz sand powder, which is placed in a high-pressure reactor for reaction;

[0089] S2.3: NiSO 4 6H 2 O and Ti (SO 4 ) 2 Dissolve in deionized water at a molar ratio of 1:2 to prepare a mixed salt solution with a concentration of 0.2-0.3 mol / L, add urea with the same molar mass as the metal ion to the mixed salt solution, stir magnetically for 2.5 hours, add to a high-pressure reactor containing PDA-modified quartz sand powder, make the PDA-modified quartz sand powder be completely immersed, then react at a hydrothermal temperature of 130°C for 15 hours, take out and rinse with deionized water, and then place in an oven at 65°C for 5 hours to obtain titanium nickel hydroxide coated quartz sand powder;

[0090] S2.4: Take 12 parts by weight of pure water, add 1.5 parts by weight of polyacrylamide and 0.04 parts by weight of hexadecyltriethoxysilane in sequence at a stirring speed of 850 rpm, stir for 15 minutes, then add 8 parts by weight of titanium nickel hydroxide-coated quartz sand powder, stir thoroughly and evenly to obtain a corrosion-resistant, water-blocking and oil-permeable material.

[0091] S3: extrusion and compounding of sensing optical cable, S3.1: a loose tube layer 2 with a thickness of 0.5 mm is mounted on the outer surface of the embedded fiber grating pressure sensor 1, the loose tube layer 2 is made of stainless steel material, and then a layer of inner sheath layer 3 with a thickness of 1 mm is extruded on the surface of the loose tube layer 2, the inner sheath layer 3 is made of high-density polyethylene material HDPE DMDA-8008H, and an inner armor layer 4 with a thickness of 1.5 mm is mounted on the outside of the inner sheath layer, the inner armor layer 4 is a fine steel wire armor, and an inner layer optical cable is obtained;

[0092] S3.2: An outer sheath layer 5 with a thickness of 0.5 mm is extruded on the surface of the inner optical cable, and the outer sheath layer 5 is composed of a high-density polyethylene material HDPE DMDA-8008H. Then, a oleophilic cracking layer 6 with a thickness of 0.6 mm is extruded on the surface of the outer sheath layer 5. The oleophilic cracking layer 6 is composed of the oleophilic cracking material obtained in step S1.3. Then, an outer armor layer 7 with a thickness of 10 mm is set on the outside of the oleophilic cracking layer 6. The outer armor layer 7 applies pressure inward to the oleophilic cracking layer 6. The outer armor layer 7 is a coarse steel wire armor. Finally, the corrosion-resistant, water-blocking and oil-permeable material obtained in step S2.4 is extruded on the outer surface of the outer armor layer to form a corrosion-resistant, water-blocking and oil-permeable layer 8 with a thickness of 0.8 mm, thereby obtaining a sensing optical cable for use in deep water.

[0093] Comparative Example 1, compared with Example 1, is different in that Comparative Example 1 removes step S2.3, and replaces the titanium nickel hydroxide-coated quartz sand powder in step S2.4 with an equal mass of PDA-modified quartz sand powder to obtain a corrosion-resistant, water-blocking and oil-permeable material. The remaining steps are the same as those in Example 1, and the obtained corrosion-resistant, water-blocking and oil-permeable material is recorded as Comparative Example 1.

[0094] Comparative Example 2, compared with Example 1, is different in that Comparative Example 2 removes step S1.2, replaces the extended chain polyurethane matrix in step S1.3 with a polyurethane matrix of equal mass to obtain a lipophilic cracking material, and the remaining steps are the same as Example 1. The obtained sensor optical cable for use in deep water is recorded as Comparative Example 2.

[0095] Comparative Example 3, compared with Example 1, is different in that magnolol is not added in step S1.3 of Comparative Example 3, and the remaining steps are the same as those of Example 1. The prepared sensor optical cable for use in deep water is recorded as Comparative Example 3.

[0096] Experiment 1: Take the sensing optical cables used in deep water prepared in Examples 1-3 and Comparative Examples 2-3, respectively wind them and fix them on the surface of a stainless steel metal pipe, with a winding spacing of 10 cm, and connect the two ends of the sensing optical cable to the transmitting end and the receiving end, respectively, to obtain a vibration-resistant detection model, immerse the sensing optical cable part of the vibration-resistant detection model in clean water, and then vibrate the vibration-resistant detection model using a vibration machine, with a vibration frequency of 60 Hz and an amplitude of 15 mm for 10 hours, and observe the number of signal fluctuations at the receiving end at 5 hours and 10 hours;

[0097] Stop the vibration, place the above-mentioned sensor optical cable in a deep-sea environment simulation test machine, add 10wt% crude oil in the deep-sea simulation environment, adjust the pressure value of the deep-sea environment simulation test machine to a water depth of 1500 meters, observe the time from the addition of crude oil to the time when the receiving end receives the first signal fluctuation, record the data, and make a table, as shown in Table 1.

[0098] Table 1: Number of signal fluctuations at the receiving end and duration of the first fluctuation after adding crude oil

[0099]

[0100] It can be seen from Examples 1-3 that the number of signal fluctuations at the receiving end after vibration for 5 hours and 10 hours is 0, indicating that the sensor optical cable prepared in the example for use in deep water has good stability and can effectively avoid false triggering caused by vibration. It can be seen from the data of Comparative Examples 2-3 that the number of signal fluctuations at the receiving end after vibration for 10 hours is increased compared with the example, which can prove that the extended chain polyurethane matrix and magnolol play an important role in the stability and vibration resistance of the lipophilic cracking material, and both are indispensable. In addition, the time for the receiving end to receive the first signal fluctuation after adding crude oil in the deep water environment of Examples 1-3 is only 2-3 minutes, indicating that the sensor optical cable prepared in the example for use in deep water can also quickly detect oil leaks in deep water and has good pressure resistance.

[0101] Experiment 2: Take 3 groups of corrosion-resistant, water-blocking and oil-permeable materials prepared in Example 1, 1 group of oleophilic cracking materials prepared in Example 1 and 1 group of comparative example 1, each group containing three materials of equal mass, respectively introduce them into a mold of 70 mm × 70 mm × 70 mm, put them into a constant temperature water bath for bonding and molding, and obtain samples after demolding;

[0102] Three samples prepared from the corrosion-resistant, water-blocking and oil-permeable materials of Example 1 and three samples prepared from the lipophilic cracking materials of Example 1 were placed in a petroleum-water mixture with an oil content of 10% and soaked for 5 minutes. The samples were then taken out and placed in a centrifugal dryer to separate the liquid in the samples. The oil content of the separated liquid was measured. The oil content of the separated liquid separated from the three samples prepared from the corrosion-resistant, water-blocking and oil-permeable materials of Example 1 was recorded as experimental group 1, and the oil content of the separated liquid separated from the three samples prepared from the lipophilic cracking materials of Example 1 was recorded as experimental group 2.

[0103] Three samples prepared from the corrosion-resistant, water-blocking and oil-permeable material of Example 1 were placed in a petroleum-salt mixed solution with an oil content of 10% and a sodium chloride concentration of 35% for 5 minutes. After the samples were taken out, they were placed in a centrifugal dryer to separate the liquid in the samples, and the oil content of the separated liquid was measured, which was recorded as Experimental Group 3;

[0104] Three samples prepared from the corrosion-resistant, water-blocking and oil-permeable materials of Example 1 and three samples of Comparative Example 1 were immersed in a 35% sodium chloride solution for 30 days, and then placed in a petroleum-salt water mixture with an oil content of 10% and a sodium chloride concentration of 35% for 5 minutes. After the samples were taken out, they were placed in a centrifugal dryer to separate the liquid in the samples, and the oil content of the separated liquid was measured. The oil content of the separated liquid separated from the three samples prepared from the corrosion-resistant, water-blocking and oil-permeable materials of Example 1 was recorded as Experimental Group 4, and the oil content of the separated liquid separated from the three samples of Comparative Example 1 was recorded as Experimental Group 5, as shown in Table 2.

[0105] Table 2: Oil content of separation liquid

[0106]

[0107] The oil contents of experimental groups 1 and 2 are both greater than 99%, which proves that the corrosion-resistant, water-blocking and oil-permeable materials and oleophilic cracking materials prepared in the examples have excellent oleophilicity and hydrophobicity. The oil contents of experimental groups 3 are both greater than 98%, which proves that the corrosion-resistant, water-blocking and oil-permeable materials prepared in the examples can also have good oleophilicity and hydrophobicity in seawater environments. It can be seen from the oil contents of experimental groups 4 and 5 that after being immersed in simulated seawater, the oleophilicity and hydrophobicity of the corrosion-resistant, water-blocking and oil-permeable materials of the examples did not change significantly, while the oil content of comparative example 1 decreased significantly, which proves that the nickel and titanium double-layer metal hydroxides can greatly enhance the corrosion resistance of the corrosion-resistant, water-blocking and oil-permeable materials to seawater.

[0108] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A sensing optical cable used in deep water, characterized in that: include: An embedded fiber Bragg grating pressure sensor, which is composed of an optical fiber, a grating arrayed on the optical fiber, and a polycarbonate sensitizing material covering the fiber Bragg grating, and is set to emit an electrical signal only when the pressure decreases below a threshold value; A loose tube layer, which covers the embedded fiber Bragg grating pressure sensor, the loose tube layer is composed of stainless steel material and has a thickness of 0.38-0.5 mm; An inner sheath layer covers the loose sheath layer, and the inner sheath layer is composed of a high-density polyethylene material HDPE DMDA-8008H, with a thickness of 0.9-1 mm; The inner armor layer covers the inner sheath layer, and the inner armor layer is a fine steel wire armor with a thickness of 1.5-2 mm; An outer sheath layer covers the inner armor layer, and the outer sheath layer is composed of a high-density polyethylene material HDPE DMDA-8008H, with a thickness of 0.3-0.5 mm; An oleophilic cracking layer covers the outer sheath layer, the oleophilic cracking layer is composed of an oleophilic cracking material and has a thickness of 0.5-0.6 mm; An outer armor layer, which covers the above-mentioned oleophilic cracking layer, and the outer armor layer is a thick steel wire armor with a thickness of 5-10mm; The corrosion-resistant, water-blocking and oil-permeable layer covers the outer armor layer. The corrosion-resistant, water-blocking and oil-permeable layer is composed of corrosion-resistant, water-blocking and oil-permeable materials and has a thickness of 0.6-0.8mm.

2. A method for preparing a sensor optical cable for use in deep water, characterized in that: The preparation method is used to prepare the sensor optical cable used in deep water as provided in claim 1, comprising the following steps: S1: Preparation of lipophilic pyrolysis materials; S2: Preparation of corrosion-resistant, water-blocking and oil-permeable materials; S3: Extrusion compounding of sensor optical cable.

3. The method for preparing a sensor optical cable for use in deep water according to claim 2, characterized in that: Step S1: Preparation of lipophilic cracking material, comprising the following steps: S1.1: Mix trihydroxy polyoxypropylene ether and hexamethylene diisocyanate in a molar ratio of 1: (0.6-0.8) in a container, and react at 80-100°C for 4-5 hours under mechanical stirring. After standing for 6-8 hours, add 4-5 times the weight of toluene at room temperature, stir for 25-30 minutes, filter, rinse with deionized water, and dry at 60-65°C to obtain a polyurethane matrix; S1.2: placing a polyurethane matrix and n-octadecyl mercaptan in a container at a molar ratio of isocyanate group to thiol functional group of 1:(0.95-1), adding 4-chlorobenzophenone with a mass fraction of 1-1.5%, and then irradiating with ultraviolet light under magnetic stirring for 2-2.5 hours to obtain a chain-extended polyurethane matrix; S1.3: 4-5 parts by weight of extended chain polyurethane matrix, 3-4 parts by weight of beeswax, 0.8-1 parts by weight of magnolol, 1-2 parts by weight of polyvinyl alcohol fiber and 1-2 parts by weight of boron-doped carbon nanotubes are stirred and evenly mixed, and then placed in a vacuum degassing machine for vacuum degassing, and then reacted at 80-82°C for 2-3 hours to obtain a lipophilic cracking material.

4. The method for preparing a sensor optical cable for use in deep water according to claim 3, characterized in that: Step S2: Preparation of corrosion-resistant, water-blocking and oil-permeable materials, including the following steps: S2.1: After cleaning the quartz sand powder with clean water, soak it in a sodium hydroxide solution with a mass fraction of 10-15% and a hydrochloric acid solution with a mass fraction of 10-15% in sequence, soaking for 45-60 minutes respectively. After soaking in the sodium hydroxide solution and the hydrochloric acid solution, rinse the quartz sand powder with clean water until the clean water after rinsing is neutral, and then put it into an oven for drying to obtain clean quartz sand powder; S2.2: Dopamine is placed in a container, and a Tris-HCl solution is added and stirred until dopamine is completely dissolved to prepare a dopamine solution with a concentration of 2.5-3 mg / mL. 8-10 parts by weight of clean quartz sand powder and 60-100 parts by weight of Tris-HCl solution are mixed and placed in a container, and stirred evenly at a stirring speed of 1000-1200 rpm to obtain a quartz sand powder dispersion. The quartz sand powder dispersion is then poured into 400-500 parts by weight of the dopamine solution while stirring at a stirring speed of 120-150 rpm, and then stirred for 8-10 hours. After filtering, the mixture is rinsed with deionized water for 3-4 times, and then dried in an oven at 60-65°C for 4-5 hours to obtain PDA-modified quartz sand powder, which is placed in a high-pressure reactor for reaction; S2.3: Dissolve NiSO4·6H2O and Ti(SO4)2 in deionized water at a molar ratio of 1:(2-3) to prepare a mixed salt solution, add urea with the same molar mass as the metal ion to the mixed salt solution, stir magnetically for 2-2.5 hours, add to a high-pressure reactor containing PDA-modified quartz sand powder to completely immerse the PDA-modified quartz sand powder, and then react at a hydrothermal temperature of 120-130°C for 12-15 hours, rinse with deionized water after taking out, and then dry in an oven at 60-65°C for 4-5 hours to obtain titanium nickel hydroxide-coated quartz sand powder; S2.4: Take 12-15 parts by weight of pure water, add 1.5-2 parts by weight of polyacrylamide and 0.04-0.06 parts by weight of hexadecyltriethoxysilane in sequence at a stirring speed of 800-850rpm, stir for 10-15 minutes, then add 8-10 parts by weight of titanium nickel hydroxide coated quartz sand powder, stir thoroughly and evenly to obtain a corrosion-resistant, water-blocking and oil-permeable material.

5. The method for preparing a sensor optical cable for use in deep water according to claim 4, characterized in that: Step S3, extrusion and compounding of the sensor optical cable, comprises the following steps: S3.1: A loose tube layer with a thickness of 0.38-0.5 mm is mounted on the outer surface of the embedded fiber Bragg grating pressure sensor, and the loose tube layer is made of stainless steel material. Then, an inner sheath layer with a thickness of 0.9-1 mm is extruded on the surface of the loose tube layer, and the inner sheath layer is made of high-density polyethylene material. An inner armor layer with a thickness of 1.5-2 mm is mounted on the outside of the inner sheath layer, and the inner armor layer is a fine steel wire armor, so as to obtain an inner optical cable; S3.2: An outer sheath layer with a thickness of 0.3-0.5mm is extruded on the surface of the inner optical cable, and the outer sheath layer is composed of a high-density polyethylene material. Then, a oleophilic cracking layer with a thickness of 0.5-0.6mm is extruded on the surface of the outer sheath layer. The oleophilic cracking layer is composed of the oleophilic cracking material obtained in step S1.

3. Then, an outer armor layer with a thickness of 5-10mm is applied to the outside of the oleophilic cracking layer. The outer armor layer applies pressure inward to the oleophilic cracking layer, and the outer armor layer is a coarse steel wire armor. Finally, the corrosion-resistant, water-blocking and oil-permeable material obtained in step S2.4 is extruded on the outer surface of the outer armor layer to form a corrosion-resistant, water-blocking and oil-permeable layer with a thickness of 0.6-0.8mm, thereby obtaining a sensing optical cable for use in deep water.

6. The method for preparing a sensor optical cable for use in deep water according to claim 3, characterized in that: The wavelength of the ultraviolet light in step S1.2 is 275-280nm, and the irradiation amount is 20-25mW / cm 2 .

7. The method for preparing a sensor optical cable for use in deep water according to claim 4, characterized in that: The concentration of the Tris-HCl solution added to dopamine in step S2.2 is 10 mM and the pH is 8-8.

5.

8. The method for preparing a sensor optical cable for use in deep water according to claim 4, characterized in that: In step S2.3, the concentration of the mixed salt solution prepared by NiSO4·6H2O, Ti(SO4)2 and deionized water is 0.2-0.3 mol / L.

9. The method for preparing a sensor optical cable for use in deep water according to claim 5, characterized in that: The high-density polyethylene materials in step S3 are all HDPE DMDA-8008H.

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