Damage repairing method for multi-way oil pipe

Abstract

The invention relates to the technical field of conveying pipelines, in particular to a damage repair method for a multi-way oil pipe, which comprises the following steps: fixing an optical fiber sensor, a resistance wire, a first microcapsule and a second microcapsule at a pipeline joint or a branch of the multi-way oil pipe, and when the optical fiber sensor monitors that the pipeline joint or the branch of the multi-way oil pipe is damaged, repairing the pipeline joint or the branch of the multi-way oil pipe; the resistance wire is powered on, so that the resistance wire is heated, the first microcapsule is broken to release the second liquid resin, meanwhile, the second microcapsule is broken to release the second curing agent, the second liquid resin and the second curing agent are subjected to a second curing reaction, and repairing is completed; the multi-way oil pipe is prepared from first liquid resin, a first curing agent and a multi-way oil pipe preform; the temperature of the resistance wire after heating is lower than the glass transition temperature of the first liquid resin and the second liquid resin. According to the method, instant and automatic repairing of the multi-way oil pipe is achieved, and the method is simple and convenient and suitable for scenes with the high requirement for the pipeline sealing performance in the industries such as oil exploitation and chemical conveying.

Description

Technical Field

[0001] The invention relates to the technical field of transportation pipelines, and in particular to a damage repair method for a multi-way oil pipe. Background Art

[0002] With the continuous growth of energy demand, the extraction and transportation technology of oil, natural gas and chemical products faces higher requirements for pipeline performance. However, for multi-way oil pipes, traditional designs have many problems. For example, the splicing molding process used is not only complicated, but also leads to weak joints, poor sealing performance and insufficient durability. It is difficult to cope with complex high temperature, high pressure and corrosive environments. Any minor damage may cause more serious safety accidents such as rupture and leakage, increasing safety hazards. Therefore, the immediate damage repair of multi-way oil pipes is of great significance.

[0003] In the existing technology, most repair methods rely on manual repair and external reinforcement, which have limited effects on restoring the pressure-bearing capacity of the pipeline, and the repair process cannot achieve instant response.

[0004] Although fiber Bragg grating (FBG) sensors have been used in the prior art for health monitoring of composite structures, for example, a patent application with patent publication number CN102564332A discloses a method of embedding FBG sensors into three-dimensional woven composite parts for monitoring strain and damage inside the material, the technical solution of the patent application only monitors the damage inside the material and does not disclose how to repair the damage. If artificial repair methods are used, the ideal repair effect cannot be achieved, and since the response of artificial repair has a time lag, it is impossible to repair the damage immediately.

[0005] Therefore, it is necessary to develop a damage repair method for multi-channel oil pipes that can be repaired instantly and automatically. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a method for repairing damage of a multi-way oil pipe.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for repairing damage of a multi-way oil pipe (i.e., an oil pipe with more than three connection ports), wherein an optical fiber sensor, a resistance wire, a first microcapsule, and a second microcapsule are fixed at a pipe connection or a branch of the multi-way oil pipe. When the optical fiber sensor detects damage at the pipe connection or the branch of the multi-way oil pipe, the resistance wire is energized to heat the resistance wire, thereby causing the first microcapsule to rupture and release a second liquid resin, and at the same time causing the second microcapsule to rupture and release a second curing agent. The second liquid resin and the second curing agent undergo a second curing reaction, thereby completing the repair;

[0009] The multi-way oil pipe is made of a first liquid resin, a first curing agent, and a multi-way oil pipe preform;

[0010] After the resistance wire is heated, its temperature is lower than the glass transition temperature of the first liquid resin and the second liquid resin, thereby preventing the resin from softening or flowing out prematurely and affecting the repair effect.

[0011] As the preferred technical solution:

[0012] In the damage repair method for a multi-pass oil pipe as described above, the optical fiber sensor is an optical fiber with multiple Bragg gratings engraved on the surface, which can respond and send a trigger signal within 1-2 seconds after the damage occurs.

[0013] In the above-mentioned method for repairing damage of a multi-channel oil pipe, the number of optical fiber sensors is multiple and arranged in parallel, and the distance between two adjacent optical fiber sensors is 2-4 mm, for example, the number of optical fiber sensors is 3-6;

[0014] In the damage repair method of a multi-way oil pipe as described above, the duration of energizing the resistance wire is ≤40s; the temperature of the resistance wire reaches 85-89°C after heating; the wall material of the first microcapsule and the second microcapsule is one of polyurethane and polystyrene; the second liquid resin is one of unsaturated polyester resin, epoxy resin, polyurethane resin and bismaleimide resin, and the second curing agent is one of anhydride, peroxide initiator, dicyandiamide, imidazoles and polyetheramine. The second liquid resin and the second curing agent can undergo a second curing reaction at 20-60°C, which can quickly restore the sealing and strength of the oil pipe connection or branch.

[0015] In the above-mentioned method for repairing damage of a multi-way oil pipe, the mass ratio of the second liquid resin to the second curing agent is 100:1.5-90.

[0016] According to the damage repair method of a multi-way oil pipe as described above, the preparation process of the multi-way oil pipe is: after injecting a mixture of a first liquid resin and a first curing agent into the multi-way oil pipe preform, a first curing reaction is carried out to obtain a multi-way oil pipe, wherein the multi-way oil pipe preform is woven from yarns, so that a seamless one-piece molding structure can be obtained through the weaving process, which is beneficial to improving the connection strength and sealing of the multi-way oil pipe at the branch.

[0017] In a method for repairing damage to a multi-way oil pipe as described above, the optical fiber sensor is fixed at the pipe connection or branch of the multi-way oil pipe in the following manner: in the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the optical fiber sensor and the yarn are combined together for weaving, thereby ensuring that the optical fiber sensor is stably and reliably fixed at the pipe connection or branch of the multi-way oil pipe.

[0018] In a method for repairing damage to a multi-way oil pipe as described above, the resistance wire is fixed at the pipe connection or branch of the multi-way oil pipe in the following manner: in the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the resistance wire and the yarn are combined together for weaving, thereby ensuring that the resistance wire is stably and reliably fixed at the pipe connection or branch of the multi-way oil pipe.

[0019] In a method for repairing damage to a multi-way oil pipe as described above, the first microcapsule and the second microcapsule are fixed at the pipe connection or branch of the multi-way oil pipe in the following manner: in the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the first microcapsule and the second microcapsule are woven into the center position of the multi-way oil pipe preform by using a round tube weaving process.

[0020] In the method for repairing damage to a multi-way oil pipe as described above, the axial tensile strength of the repaired multi-way oil pipe is 91-95% of the axial tensile strength of the multi-way oil pipe before damage. The repaired multi-way oil pipe did not leak in the sealing test and can maintain good performance in an actual working environment.

[0021] Beneficial effects:

[0022] (1) The present invention fixes the optical fiber sensor, the resistance wire, the first microcapsule and the second microcapsule at the pipe connection or branch of the multi-way oil pipe. When the optical fiber sensor detects damage, the system automatically triggers the resistance wire to heat, causing the first microcapsule to rupture and release the second liquid resin, and at the same time causing the second microcapsule to rupture and release the second curing agent. The second liquid resin reacts with the second curing agent to repair the damage at the pipe connection or branch. This not only realizes the instant and rapid detection of damage of the multi-way oil pipe, but also automatically starts the repair process immediately after the damage is detected, and quickly restores the sealing performance of the pipe. There is no need to stop the operation or manual intervention, and the damage is repaired instantly and automatically, which significantly improves the repair efficiency.

[0023] (2) The damage repair method of the multi-way oil pipe of the present invention is easy to operate, reduces the maintenance cost, and is suitable for scenes with high requirements on pipeline sealing performance in industries such as oil extraction and chemical transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the multi-way oil pipe used in the present invention;

[0025] Among them, 1 is an optical fiber sensor, 2 is a resistance wire, 3 is a first microcapsule, 4 is a second microcapsule, and 5 is a tube body. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0027] The following are the test methods for the relevant performance indicators in each embodiment:

[0028] (1) Axial tensile strength: Tested in accordance with GB / T 5349-2005 "Test method for axial tensile properties of fiber reinforced thermosetting plastic pipes".

[0029] (2) Sealing: The specific testing methods are as follows:

[0030] First, a MAXIMATOR G350 (maximum pressure 350MPa) high-pressure pump was used to step-up the pressure in the sample cavity with air as the medium. The pressure was increased by 10% PN each time and maintained for 10 minutes. After reaching 3×PN, the pressure was maintained for 8 hours.

[0031] Then the LACO Technologies MS68-2 leak test system was used to detect leaks;

[0032] Finally, the leakage rate was judged to be <1×10 -2 mg / (m·s) is true. If so, it is considered as no leakage; otherwise, it is considered as leakage.

[0033] Example 1

[0034] A method for repairing damage of a multi-way oil pipe, the specific steps are as follows:

[0035] (1) Prepare raw materials;

[0036] Fiber optic sensor: The optical fiber has eight Bragg gratings engraved on the surface, and the number of fiber optic sensors is 3;

[0037] Resistance wire: manufacturer is ESAB, model is OK Autrod 16.12 (Ni80Cr20 alloy, diameter 0.3mm);

[0038] The first liquid resin: bisphenol A epoxy resin, manufactured by Baling Petrochemical Co., Ltd., brand CYD-128, glass transition temperature 120°C;

[0039] First curing agent: modified fatty amine, manufactured by Evonik, brand Ancamine® 2441;

[0040] The first microcapsule: the wall material is polyurethane, the manufacturer is Jiangsu Zhongke Polymer New Material Industry Technology Research Institute Co., Ltd., the brand is ETPU, the first microcapsule encapsulates the second liquid resin (bisphenol F type epoxy resin, the manufacturer is WestlakeEpoxy, the brand is Epoxy Research Resin RSL 4515, the glass transition temperature is 148℃);

[0041] Second microcapsule: the wall material is polyurethane, the manufacturer is Jiangsu Zhongke Polymer New Material Industry Technology Research Institute Co., Ltd., the brand is ETPU, the second microcapsule encapsulates the second curing agent (latent imidazole, the manufacturer is Asahi Kasei Novacure, the brand is HX-3941HP), the mass ratio of the second liquid resin to the second curing agent is 100:8;

[0042] Yarn: 12k carbon fiber, manufacturer is Toray, model is T700;

[0043] (2) Braided multi-pass oil pipe preform;

[0044] A multi-way oil pipe preform is formed by yarn weaving, and the multi-way oil pipe preform is a four-way oil pipe preform;

[0045] In the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the optical fiber sensor and the yarn are combined together for weaving, and the optical fiber sensors are arranged in parallel, and the distance between two adjacent optical fiber sensors is 2 mm, so that the optical fiber sensor is fixed at the pipe connection or branch of the multi-way oil pipe;

[0046] In the process of braiding the multi-way oil pipe preform, when braiding the pipe connection or branch of the multi-way oil pipe preform, the resistance wire and the yarn are combined together for braiding, so as to fix the resistance wire at the pipe connection or branch of the multi-way oil pipe;

[0047] In the process of braiding the multi-way oil pipe preform, when braiding the pipe connection or branch of the multi-way oil pipe preform, the first microcapsule and the second microcapsule are braided into the center position of the multi-way oil pipe preform by using the round tube braiding process, so as to fix the first microcapsule and the second microcapsule at the pipe connection or branch of the multi-way oil pipe;

[0048] (3) Preparation of multi-way oil pipes;

[0049] After the mixture of the first liquid resin and the first curing agent is injected into the multi-way oil pipe preform, a first curing reaction is performed to obtain a multi-way oil pipe, such as Figure 1 As shown, the multi-pass oil pipe is composed of an optical fiber sensor 1, a resistance wire 2, a first microcapsule 3, a second microcapsule 4 and a pipe body 5;

[0050] In the mixture of the first liquid resin and the first curing agent, the weight ratio of the first liquid resin to the first curing agent is 100:28;

[0051] (4) Detect and repair damage;

[0052] When the optical fiber sensor detects damage at the pipe connection or branch of the multi-way oil pipe, the resistance wire is energized to make it heat up. The duration of energizing the resistance wire is 30 seconds. After the resistance wire is heated, the temperature reaches 89°C. After the resistance wire is heated, the temperature is lower than the glass transition temperature of the first liquid resin and the second liquid resin, causing the first microcapsule to rupture and release the second liquid resin. At the same time, the second microcapsule is ruptured to release the second curing agent. The second liquid resin and the second curing agent undergo a second curing reaction, and the repair is completed.

[0053] The axial tensile strength of the repaired multi-way oil pipe is 91% of the axial tensile strength of the multi-way oil pipe before damage, and the repaired multi-way oil pipe does not leak in the sealing test.

[0054] Example 2

[0055] A method for repairing damage of a multi-way oil pipe, the specific steps are as follows:

[0056] (1) Prepare raw materials;

[0057] Fiber optic sensor: The fiber has ten Bragg gratings engraved on the surface, and the number of fiber optic sensors is 5;

[0058] Resistance wire: manufacturer is Sandvik, model is KANTHAL A-1 (FeCrAl alloy, diameter 0.25mm);

[0059] The first liquid resin: polyester polyol, manufactured by Covestro, brand name Desmophen® 670BA, glass transition temperature of 90°C;

[0060] First curing agent: manufacturer is Covestro, brand name is Desmodur® ultra E 30500, mixing ratio is 100:33.

[0061] The first microcapsule: the wall material is polystyrene, the manufacturer is Zhongke Leiming (Beijing) Technology Co., Ltd., the brand is PS080000, and the first microcapsule encapsulates the second liquid resin (unsaturated polyester resin, the manufacturer is INEOS gronp, the brand is Aropol™, and the glass transition temperature is 100°C);

[0062] Second microcapsule: the wall material is polyurethane, the manufacturer is Jiangsu Zhongke Polymer New Material Industry Technology Research Institute Co., Ltd., the brand is ETPU, the second microcapsule encapsulates the second curing agent (benzoyl peroxide, the manufacturer is AkzoNobel, the brand is AkzoNobel Perkadox CH-50), the mass ratio of the second liquid resin to the second curing agent is 100:1.8;

[0063] Yarn: 12k carbon fiber, manufacturer is Hexcel, model is HexForce® 12K;

[0064] (2) Braided multi-pass oil pipe preform;

[0065] A multi-way oil pipe preform is formed by yarn weaving, and the multi-way oil pipe preform is a four-way oil pipe preform;

[0066] In the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the optical fiber sensor and the yarn are combined together for weaving, and the optical fiber sensors are arranged in parallel, and the distance between two adjacent optical fiber sensors is 3mm, so that the optical fiber sensor is fixed at the pipe connection or branch of the multi-way oil pipe;

[0067] In the process of braiding the multi-way oil pipe preform, when braiding the pipe connection or branch of the multi-way oil pipe preform, the resistance wire and the yarn are combined together for braiding, so as to fix the resistance wire at the pipe connection or branch of the multi-way oil pipe;

[0068] In the process of braiding the multi-way oil pipe preform, when braiding the pipe connection or branch of the multi-way oil pipe preform, the first microcapsule and the second microcapsule are braided into the center position of the multi-way oil pipe preform by using the round tube braiding process, so as to fix the first microcapsule and the second microcapsule at the pipe connection or branch of the multi-way oil pipe;

[0069] (3) Preparation of multi-way oil pipes;

[0070] After the mixture of the first liquid resin and the first curing agent is injected into the multi-way oil pipe preform, a first curing reaction is performed to obtain a multi-way oil pipe, such as Figure 1 As shown, the multi-pass oil pipe is composed of an optical fiber sensor 1, a resistance wire 2, a first microcapsule 3, a second microcapsule 4 and a pipe body 5;

[0071] In the mixture of the first liquid resin and the first curing agent, the weight ratio of the first liquid resin to the first curing agent is 100:95;

[0072] (4) Detect and repair damage;

[0073] When the optical fiber sensor detects damage at the pipe connection or branch of the multi-way oil pipe, the resistance wire is energized to make it heat up. The duration of energizing the resistance wire is 34 seconds. After the resistance wire is heated, the temperature reaches 85°C. After the resistance wire is heated, the temperature is lower than the glass transition temperature of the first liquid resin and the second liquid resin, causing the first microcapsule to rupture and release the second liquid resin. At the same time, the second microcapsule is ruptured to release the second curing agent. The second liquid resin and the second curing agent undergo a second curing reaction, and the repair is completed.

[0074] The axial tensile strength of the repaired multi-way oil pipe is 93% of the axial tensile strength of the multi-way oil pipe before damage, and the repaired multi-way oil pipe does not leak in the sealing test.

[0075] Example 3

[0076] A method for repairing damage of a multi-way oil pipe, the specific steps are as follows:

[0077] (1) Prepare raw materials;

[0078] Fiber optic sensor: The optical fiber has twelve Bragg gratings engraved on the surface, and the number of fiber optic sensors is 6;

[0079] Resistance wire: The manufacturer is Japan Kobelco (KOBELCO), model is NCF 600 (NiCr alloy, diameter 0.2mm);

[0080] The first liquid resin: epoxy resin, manufactured by Changshu Juhe Chemical Co., Ltd., brand JC-02A, glass transition temperature 135°C;

[0081] The first curing agent: the manufacturer is Changshu Juhe Chemical Co., Ltd., the brand is JC-02B;

[0082] The first microcapsule: the wall material is polyurethane, the manufacturer is Jiangsu Zhongke Polymer New Material Industry Technology Research Institute Co., Ltd., the brand is ETPU, the first microcapsule encapsulates the second liquid resin (low-temperature curing epoxy resin, the manufacturer is Huntsman, the brand is Huntsman Araldite LY 3585, the glass transition temperature is 128°C);

[0083] Second microcapsule: The wall material is polyurethane, the manufacturer is Jiangsu Zhongke Polymer New Material Industry Technology Research Institute Co., Ltd., the brand is ETPU, the second microcapsule encapsulates the second curing agent (modified polyetheramine, the manufacturer is Huntsman, the brand is JEFFAMINE® D-230 Polyetheramine), the mass ratio of the second liquid resin to the second curing agent is 100:8.5;

[0084] Yarn: 12k carbon fiber, manufacturer is SGL Carbon, model is SIGRAFIL® 12K;

[0085] (2) Braided multi-pass oil pipe preform;

[0086] A multi-way oil pipe preform is formed by yarn weaving, and the multi-way oil pipe preform is a four-way oil pipe preform;

[0087] In the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the optical fiber sensor and the yarn are combined together for weaving, and the optical fiber sensors are arranged in parallel, and the distance between two adjacent optical fiber sensors is 4 mm, so that the optical fiber sensor is fixed at the pipe connection or branch of the multi-way oil pipe;

[0088] In the process of braiding the multi-way oil pipe preform, when braiding the pipe connection or branch of the multi-way oil pipe preform, the resistance wire and the yarn are combined together for braiding, so as to fix the resistance wire at the pipe connection or branch of the multi-way oil pipe;

[0089] In the process of braiding the multi-way oil pipe preform, when braiding the pipe connection or branch of the multi-way oil pipe preform, the first microcapsule and the second microcapsule are braided into the center position of the multi-way oil pipe preform by using the round tube braiding process, so as to fix the first microcapsule and the second microcapsule at the pipe connection or branch of the multi-way oil pipe;

[0090] (3) Preparation of multi-way oil pipes;

[0091] After the mixture of the first liquid resin and the first curing agent is injected into the multi-way oil pipe preform, a first curing reaction is performed to obtain a multi-way oil pipe, such as Figure 1 As shown, the multi-pass oil pipe is composed of an optical fiber sensor 1, a resistance wire 2, a first microcapsule 3, a second microcapsule 4 and a pipe body 5;

[0092] In the mixture of the first liquid resin and the first curing agent, the weight ratio of the first liquid resin to the first curing agent is 100:85;

[0093] (4) Detect and repair damage;

[0094] When the optical fiber sensor detects damage at the pipe connection or branch of the multi-way oil pipe, the resistance wire is energized to make it heat up. The duration of energizing the resistance wire is 37 seconds. After the resistance wire is heated, the temperature reaches 85°C. After the resistance wire is heated, the temperature is lower than the glass transition temperature of the first liquid resin and the second liquid resin, causing the first microcapsule to rupture and release the second liquid resin. At the same time, the second microcapsule is ruptured to release the second curing agent. The second liquid resin and the second curing agent undergo a second curing reaction, and the repair is completed.

[0095] The axial tensile strength of the repaired multi-way oil pipe is 95% of the axial tensile strength of the multi-way oil pipe before damage, and the repaired multi-way oil pipe has no leakage in the sealing test.

Claims

1. A method for repairing damage to a multi-way oil pipe, characterized in that: The optical fiber sensor, the resistance wire, the first microcapsule and the second microcapsule are fixed at the pipe connection or branch of the multi-way oil pipe. When the optical fiber sensor detects that the pipe connection or branch of the multi-way oil pipe is damaged, the resistance wire is energized to heat the resistance wire, thereby causing the first microcapsule to rupture and release the second liquid resin, and at the same time causing the second microcapsule to rupture and release the second curing agent. The second liquid resin and the second curing agent undergo a second curing reaction, thereby completing the repair. The multi-way oil pipe is made of a first liquid resin, a first curing agent, and a multi-way oil pipe preform; After the resistance wire is heated, the temperature thereof is lower than the glass transition temperature of the first liquid resin and the second liquid resin.

2. A method for repairing damage to a multi-way oil pipe according to claim 1, characterized in that: The fiber optic sensor is an optical fiber with multiple Bragg gratings engraved on its surface.

3. A method for repairing damage to a multi-way oil pipe according to claim 1, characterized in that: There are multiple optical fiber sensors which are arranged in parallel, and the distance between two adjacent optical fiber sensors is 2-4 mm.

4. A method for repairing damage to a multi-way oil pipe according to claim 1, characterized in that: The duration of powering the resistance wire is ≤40s; the temperature of the resistance wire reaches 85-89°C after heating; the wall material of the first microcapsule and the second microcapsule is one of polyurethane and polystyrene; the second liquid resin is one of unsaturated polyester resin, epoxy resin, polyurethane resin and bismaleimide resin, and the second curing agent is one of acid anhydride, peroxide initiator, dicyandiamide, imidazoles and polyetheramine.

5. A method for repairing damage to a multi-way oil pipe according to claim 4, characterized in that: The mass ratio of the second liquid resin to the second curing agent is 100:1.5-90.

6. The method for repairing damage of a multi-way oil pipe according to claim 1, characterized in that: The preparation process of the multi-way oil pipe is as follows: after injecting a mixture of a first liquid resin and a first curing agent into a multi-way oil pipe preform, a first curing reaction is performed to obtain the multi-way oil pipe, wherein the multi-way oil pipe preform is woven from yarns.

7. A method for repairing damage to a multi-way oil pipe according to claim 6, characterized in that: The optical fiber sensor is fixed to the pipe connection or branch of the multi-way oil pipe by combining the optical fiber sensor and the yarn for weaving during the weaving of the multi-way oil pipe preform.

8. A method for repairing damage to a multi-way oil pipe according to claim 6, characterized in that: The resistance wire is fixed at the pipe connection or branch of the multi-way oil pipe by combining the resistance wire and the yarn for weaving during the weaving of the multi-way oil pipe preform.

9. A method for repairing damage to a multi-way oil pipe according to claim 6, characterized in that: The first microcapsule and the second microcapsule are fixed at the pipe connection or branch of the multi-way oil pipe as follows: in the process of weaving the multi-way oil pipe preform, when weaving the pipe connection or branch of the multi-way oil pipe preform, the first microcapsule and the second microcapsule are woven into the center position of the multi-way oil pipe preform by using a round tube weaving process.

10. The method for repairing damage of a multi-way oil pipe according to claim 1, characterized in that: The axial tensile strength of the repaired multi-way oil pipe is 91-95% of the axial tensile strength of the multi-way oil pipe before damage, and the repaired multi-way oil pipe has no leakage in the sealing test.

Images