Underwater pipeline corrosion monitoring device based on field fingerprint method

Abstract

The invention discloses an underwater pipeline corrosion monitoring device based on a field fingerprint method, which comprises a monitoring unit, the monitoring unit comprises a signal acquisition pipe, and the signal acquisition pipe is provided with a field fingerprint monitoring sensor assembly; a sealed cabin is arranged outside the monitoring unit, and an electrical equipment cabin is connected to the sealed cabin; the underwater pipeline corrosion monitoring device further comprises an anti-corrosion system. On the basis of a field fingerprint method technology, a signal acquisition pipe weld joint design is adopted, and pipeline high-precision uniform corrosion, local corrosion, weld joint corrosion and pipeline corrosion pit depth monitoring can be achieved. According to the invention, a full-sealing waterproof pressure-resistant corrosion-resistant design is adopted, long-term monitoring can be carried out on the subsea pipeline in a deep sea environment, a nondestructive monitoring technology is adopted, and the service life is long. The device can work in the deep sea environment for a long time and is used for monitoring the corrosion defect of the inner wall of the pipeline in the deep sea environment.

Description

Technical Field

[0001] This invention relates to the field of industrial corrosion monitoring, and in particular to an underwater pipeline corrosion monitoring device based on field fingerprinting. Background Technology

[0002] Corrosion monitoring devices are essential for obtaining pipeline corrosion information. Conventional corrosion monitoring devices are installed at both ends of subsea pipelines to collect various corrosion data for corrosion risk analysis and assessment. In subsea oil production, the pipeline inlet is located on the seabed, and the outlet is on the production platform. Since conventional corrosion monitoring devices can only be used above the waterline, they cannot be used for pipelines located on the seabed. Therefore, a corrosion monitoring device suitable for subsea pipelines is needed to effectively monitor corrosion at the pipeline inlet during subsea oil production. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides an underwater pipeline corrosion monitoring device based on field fingerprinting, which can monitor the corrosion of subsea pipelines in deep-sea environments.

[0004] The present invention is achieved by the following technical solution.

[0005] An underwater pipeline corrosion monitoring device based on field fingerprinting includes a monitoring unit, which includes a signal acquisition tube and a field fingerprint monitoring sensor assembly mounted on the signal acquisition tube; a sealed chamber is provided outside the monitoring unit, and an electrical equipment compartment is connected to the sealed chamber; the underwater pipeline corrosion monitoring device also includes an anti-corrosion system.

[0006] Furthermore, the field fingerprint monitoring sensor assembly includes a signal acquisition matrix, with a ring current input terminal and a ring current output terminal on both sides of the signal acquisition matrix, and a reference plate on one side of the ring current input terminal; a weld is formed on the signal acquisition tube, and the weld is located in the signal acquisition matrix.

[0007] Furthermore, the reference board is equipped with several terminals for reference signal acquisition and monitoring of current input and output.

[0008] Furthermore, the signal acquisition matrix consists of multiple connector pins. The number of connector pins in the signal acquisition matrix is ​​equal to the number of annular current input terminals and annular current output terminals in the pipe circumferential direction, and they are arranged in a straight line in the pipe axial direction.

[0009] Furthermore, the sealed chamber includes a sealing tube with insulating flanges at both ends; a signal cable outlet flange is provided on the sealing tube.

[0010] Furthermore, the insulating flange includes a mating flange and an open blind flange, which connects the sealed chamber to the monitoring unit and seals the sealed chamber.

[0011] Furthermore, the electrical equipment compartment includes an equipment compartment tube, with an equipment fixing flange and a cable bus outlet flange respectively provided at both ends of the equipment compartment tube; a signal cable inlet flange is provided on the equipment compartment tube, and the signal cable inlet flange is connected to the signal cable outlet flange.

[0012] Furthermore, the equipment fixing flange includes a flange plate, an electrical equipment blind flange, and an equipment mounting bracket, with the equipment mounting bracket connected to the electrical equipment blind flange; the cable bus outlet flange includes a flange plate and a bus outlet blind flange, with the bus outlet blind flange including a perforated blind flange, a steel pipe welded to the blind flange, and a multi-core signal cable running through the steel pipe.

[0013] Furthermore, the corrosion protection system includes sacrificial anodes installed on the monitoring unit and the sealed chamber, as well as a corrosion protection layer on the entire surface of the device.

[0014] Furthermore, a protective cover is provided outside the electrical equipment compartment. The protective cover includes a top plate and a side plate. The side plate is designed with multiple air guide holes, and the lower part of the side plate is connected to the sealed compartment.

[0015] This application has the following beneficial effects: (1) Based on the field fingerprinting method, this invention adopts the signal acquisition tube weld design, which can realize high-precision monitoring of pipeline uniform corrosion, local corrosion, weld corrosion and pipeline corrosion pit depth, and is a non-destructive monitoring technology.

[0016] (2) The present invention adopts a fully sealed, waterproof, pressure-resistant and corrosion-resistant design, which can carry out long-term monitoring of subsea pipelines in deep-sea environment. It is also a non-destructive monitoring technology with a long service life.

[0017] (3) The present invention adopts a design such as fully solidified encapsulation of sensor components, ring current terminals, and filling of sealed inner cavity with heat insulation material, which improves the reliability and accuracy of the monitoring system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the monitoring unit of the present invention; Figure 3 This is a schematic diagram of the sealed chamber structure of the present invention; Figure 4 This is a schematic diagram of the electrical equipment compartment of the present invention.

[0019] Figure 5 This is a schematic diagram of the structure of the protective cover of the present invention; Figure 6 This is a structural schematic diagram of the device mounting bracket intended to illustrate the present invention.

[0020] The components include: 1. Monitoring unit; 1.1. Signal acquisition tube; 1.2. Reference board; 1.3.1. Circular current input terminal; 1.3.2. Circular current output terminal; 1.4. Signal acquisition matrix; 2. Sealed chamber; 2.1. Sealing tube; 2.2. Signal cable outlet flange; 2.3. Insulating flange; 3. Electrical equipment chamber; 3.1. Cable bus outlet flange; 3.2. Equipment fixing flange; 3.2.1. Equipment mounting bracket; 3.2.2. Electrical equipment blind flange; 3.3. Signal cable inlet flange; 3.4. Equipment chamber tube; 4. Sacrificial anode; 5. Protective cover. Detailed Implementation

[0021] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0022] like Figure 1 As shown, an underwater pipeline corrosion monitoring device based on field fingerprinting includes a monitoring unit 1, a sealed chamber 2, an electrical equipment chamber 3, an anti-corrosion system, and a protective cover 5. It performs real-time monitoring of corrosion defects on the inner wall of the pipeline based on field fingerprinting. The monitoring unit 1 includes components such as signal acquisition pipes and terminals. The sealed chamber 2 is installed on the monitoring unit's pipeline, providing waterproof sealing protection for the components within the monitoring unit 1. The electrical equipment chamber 3 houses various electrical devices of the system and is fixed to the sealed chamber 2. The anti-corrosion system consists of sacrificial anodes 4 installed on the monitoring unit 1 and the sealed chamber 2, and an anti-corrosion layer covering the entire surface of the device. A protective cover 5 is installed outside the electrical equipment chamber 3.

[0023] like Figure 2 As shown, the monitoring unit 1 is installed in the main flow of the pipeline to be monitored. The monitoring unit 1 consists of a signal acquisition tube 1.1, a weld, a flange, and a field fingerprint monitoring sensor assembly.

[0024] The material, inner diameter, and wall thickness of the signal acquisition tube 1.1 in this application are consistent with those of the monitored subsea pipeline. The weld seam of the signal acquisition tube 1.1 is located within the signal acquisition matrix 1.4, and the welding process of the weld seam is consistent with that of the monitored subsea pipeline, ensuring that the conditions of the signal acquisition tube 1.1 itself and its monitoring environment are the same as those of the subsea pipeline under test. The field fingerprint monitoring sensor assembly is fixed on the signal acquisition tube 1.1 and consists of a reference plate 1.2, a ring current input terminal 1.3.1, a ring current output terminal 1.3.2, the signal acquisition matrix 1.4, and encapsulating adhesive. The encapsulating adhesive can be selected from materials such as high-temperature epoxy resin. The encapsulating adhesive is cast onto the field fingerprint monitoring sensor assembly to permanently fix all components and wiring connectors, providing product reliability.

[0025] The reference plate 1.2 is made of the same material and has the same wall thickness as the signal acquisition tube 1.1. The reference plate 1.2 is fixed to the signal acquisition tube 1.1 and is insulated from the signal acquisition tube. Four terminals are installed on the reference plate 1.2 for reference signal acquisition and monitoring current input and output, wherein the two middle terminals of the reference plate 1.2 are reference signal terminals.

[0026] The signal acquisition matrix 1.4 consists of multiple connection pins. The number of connection pins in the circumferential direction of the pipe is equal to that of the annular current input terminal 1.3.1 and the annular current output terminal 1.3.2, and they are arranged in a straight line in the axial direction of the pipe. Signal line connection method: The reference board input terminal is connected to a signal input line for signal input; the reference board output terminal is connected to the annular current input terminal 1.3.1; and each annular current output terminal 1.3.2 is connected to a signal line for signal output. Each acquisition matrix pin is connected to a signal line for voltage signal acquisition. This design and wiring method ensures a uniform electric field in each signal acquisition matrix, reducing the error of the monitoring system.

[0027] The manufacturing method of monitoring unit 1 of this invention is as follows: Two pipe sections identical to those to be tested are selected and welded together. After non-destructive testing meets the requirements, they are ready for use. According to the design, studs are welded onto the pipe to form a signal acquisition matrix 1.4. Studs are welded on both sides of the signal acquisition matrix 1.4 to form a ring current input terminal 1.3.1 and a ring current output terminal 1.3.2, respectively. An insulating layer is applied to the surface of the reference plate 1.2. Two fixing studs are welded on one side of the ring current input terminal 1.3.1. The reference plate 1.2 is fixed to the signal acquisition tube 1.1 by the fixing studs (the fixing studs and the fixing holes of the reference plate are not shown). Requirements: ① Insulation treatment is applied between the fixing studs and the reference plate 1.2. ② The reference plate 1.2 and the signal acquisition tube 1.1 are tightly attached together. After the above work is completed, pour a layer of epoxy resin onto the surface of the signal acquisition tube 1.1, then connect the signal lines to each terminal block. The terminal block connectors can be encapsulated with epoxy resin. Then, apply a thick polyurethane insulation layer to the epoxy resin surface. The insulation layer should be thick enough to fill the inner cavity of the sealed chamber 2. The length of the epoxy resin and the polyurethane insulation layer should be consistent with the length of the inner cavity of the sealed chamber 2.

[0028] like Figure 3 As shown, the sealed chamber 2 consists of an insulating flange 2.3, a sealing pipe 2.1, a signal cable outlet flange 2.2, and a sealed inner cavity. The insulating flange 2.3 is installed at both ends of the pipe and consists of a mating flange, an insulating gasket, and a blind flange with openings. The outer surface of the insulating flange 2.3 is covered with an insulating material, such as underwater viscoelastic tape. The signal cable outlet flange 2.2 includes a signal outlet pipe seat and flange installed above the pipe, from which various signal lines are led out from within the sealed chamber 2.

[0029] The sealed inner cavity is filled with a material that has thermal insulation and sealing properties to ensure that the temperature of the reference plate 1.2 is consistent with the temperature of the signal acquisition tube 1.1. The filling material must have good thermal insulation performance, and thermal insulation materials such as polyurethane foam can be used to reduce the error caused by the temperature inconsistency of the reference plate 1.2.

[0030] The fabrication method of the sealed chamber 2 is as follows: Select a suitable pipe section as the sealed pipe 2.1, make an opening on the sealed pipe 2.1, and install the pipe seat and flange by welding to form the signal cable outlet flange 2.2. Weld a flange plate (the butt flange plate of the insulating flange 2.3) to each end of the sealed pipe 2.1, and then seal it with a blind flange for pressure testing. Seal the signal cable outlet flange 2.2 with a blind flange with a pressure testing interface. Perform non-destructive testing and pressure testing on the sealed chamber 2 according to relevant standard requirements (remove the blind flange for pressure testing after the test is completed), and set it aside for use. A flange (the perforated blind flange of insulating flange 2.3) is welded onto the signal acquisition tube 1.1. The sealing tube 2.1 is passed through one end of the monitoring unit 1 and connected to the perforated blind flange of insulating flange 2.3 via an insulating gasket. The signal cable from monitoring unit 1 exits through the signal cable outlet flange 2.2. The other perforated blind flange of insulating flange 2.3 and an insulating gasket are passed through monitoring unit 1 and connected to one flange of sealing tube 2.1. The perforated blind flange of insulating flange 2.3 is then fixed to the signal acquisition tube 1.1 by welding. Non-destructive testing is performed on the weld. After the above work is completed, an anti-corrosion layer is applied to the surfaces of signal acquisition unit 1 and the sealed chamber 2.

[0031] like Figure 4 , 6 As shown, the electrical equipment compartment 3 consists of a cable bus outlet flange 3.1, an equipment mounting flange 3.2, a signal cable inlet flange 3.3, and an equipment compartment tube 3.4. The signal cable inlet flange 3.3 consists of a pipe seat and a flange plate, which are sequentially welded to the equipment compartment tube 3.4. The equipment mounting flange 3.2 is installed at one end of the equipment compartment tube 3.4 and consists of a flange plate, a gasket, an electrical equipment blind flange 3.2.2, and an equipment mounting bracket 3.2.1. The equipment mounting bracket 3.2.1 has multiple threaded holes. The electrical equipment is placed on the equipment mounting bracket 3.2.1 and, during installation, enters the equipment compartment tube 3.4 along with the electrical equipment blind flange 3.2.2, making installation simple and convenient. The cable bus outlet flange 3.1 is installed at the other end of the equipment compartment tube 3.4 and consists of a flange plate, a gasket, and a bus outlet blind flange. The bus outlet blind flange consists of a perforated blind flange, a gasket, a multi-core signal cable, and a steel pipe welded to the blind flange. The steel pipe passes through the hole of the blind flange and is welded and fixed. A channel is provided inside the steel pipe, through which the multi-core signal cable passes. The remaining cavity of the steel pipe is filled and sealed with epoxy resin.

[0032] The construction method of electrical equipment compartment 3 is as follows: An opening is made in the equipment compartment pipe 3.4, and a pipe seat and flange are welded to form the signal cable inlet flange 3.3. Two flanges are welded to both ends of the equipment compartment pipe 3.4, and two blind flanges (one of which has a pressure testing interface) are connected to each other. Simultaneously, the blind flanges are connected to the signal cable inlet flange 3.3 (the blind flanges are removed after the test). Non-destructive testing and pressure testing are performed on electrical equipment compartment 3 according to relevant standards. Then, an anti-corrosion layer is applied to the surface of electrical equipment compartment 3. The signal cable from the signal cable outlet flange 2.2 is introduced into electrical equipment compartment 3 through the signal cable inlet flange 3.3. The signal cable outlet flange 2.2 and the signal cable inlet flange 3.3 are connected. Pressure is applied through the blind flange with a pressure testing interface on one side of the equipment compartment pipe 3.4 to perform a pressure test on the entire sealed compartment 2 and electrical equipment compartment 3. Install the equipment mounting bracket 3.2.1 on the blind flange 3.2.2 of the electrical equipment. Fix the electrical equipment on the mounting bracket 3.2.1. Connect the signal cable to the electrical equipment. Connect the blind flange 3.2.2 of the electrical equipment to the flange plate on one side of the equipment compartment tube 3.4. Install the cable bus outlet flange 3.1. Lead out the main outlet signal cable through the cable bus outlet flange 3.1 and transmit it to the terminal through cable or optical fiber.

[0033] The anti-corrosion system consists of sacrificial anodes 4 and an anti-corrosion layer on the outer surface of the device. The sacrificial anodes 4 are respectively installed on the pipe walls of the monitoring unit 1 and the sealed chamber 2. The anti-corrosion layer on the outer surface of the device is designed to provide long-term corrosion protection in seawater environments. The anti-corrosion layer material can be underwater viscoelastic tape, 3PE, 3PP, or other long-term anti-corrosion materials, ensuring that the entire device can operate in deep-sea environments for extended periods without being damaged by seawater corrosion.

[0034] like Figure 5 As shown, the protective cover 5 consists of a top plate and side plates, both made of metal. The side plates have multiple drainage holes to prevent the protective current from being shielded. The joints and outer surfaces of the top and side plates are smooth and flat to prevent entanglement by fishing nets or other foreign objects. After holes are drilled on both sides of the protective cover 5 and anti-corrosion treatment is applied, it is fixed to the sealing pipe 2.1 by welding. The protective cover 5 protects the electrical equipment compartment 3.

[0035] like Figure 1 As shown, a pair of bracelet-type sacrificial anodes 4 are welded onto the signal acquisition tube 1.1 and the sealing tube 2.1 respectively, and the welded areas are treated with anti-corrosion measures. Flanges are welded to both sides of the signal acquisition tube 1.1, and non-destructive testing and pressure testing are performed according to relevant standards. During on-site installation, if... Figure 1 The underwater pipeline corrosion monitoring device shown is a skid-mounted unit that is placed in the water and connected to the pipeline to be tested. The monitoring system outlet cable inside the underwater pipeline corrosion monitoring device is connected to an external signal line to transmit the signal to the terminal, thereby realizing the function of real-time corrosion monitoring.

[0036] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An underwater pipeline corrosion monitoring device based on field fingerprinting method, characterized in that: The device includes a monitoring unit (1), which includes a signal acquisition tube (1.1) and a field fingerprint monitoring sensor assembly on the signal acquisition tube (1.1); a sealed chamber (2) is provided outside the monitoring unit (1), and an electrical equipment chamber (3) is connected to the sealed chamber (2); the underwater pipeline corrosion monitoring device also includes an anti-corrosion system.

2. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 1, characterized in that: The field fingerprint monitoring sensor assembly includes a signal acquisition matrix (1.4), with a ring current input terminal (1.3.1) and a ring current output terminal (1.3.2) respectively on both sides of the signal acquisition matrix (1.4), and a reference plate (1.2) on one side of the ring current input terminal (1.3.1); a weld is formed on the signal acquisition tube (1.1), and the weld is set in the signal acquisition matrix (1.4).

3. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 2, characterized in that: Several terminals are installed on the reference board (1.2) for reference signal acquisition and monitoring of current input and output.

4. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 2, characterized in that: The signal acquisition matrix (1.4) consists of multiple connector pins. The number of connector pins in the signal acquisition matrix is ​​equal to that of the annular current input terminal (1.3.1) and the annular current output terminal (1.3.2) in the pipe ring direction, and they are arranged in a straight line in the pipe axial direction.

5. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 1, characterized in that: The sealed chamber (2) includes a sealing tube (2.1), with insulating flanges (2.3) at both ends of the sealing tube (2.1); and a signal cable outlet flange (2.2) is provided on the sealing tube (2.1).

6. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 5, characterized in that: The insulating flange (2.3) includes a mating flange and an open blind flange. The insulating flange (2.3) connects the sealed chamber (2) to the monitoring unit (1) and seals the sealed chamber (2).

7. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 1, characterized in that: The electrical equipment compartment (3) includes an equipment compartment tube (3.4), with an equipment fixing flange (3.2) and a cable bus outlet flange (3.1) respectively at both ends of the equipment compartment tube (3.4); a signal cable inlet flange (3.3) is provided on the equipment compartment tube (3.4), and the signal cable inlet flange (3.3) is connected to the signal cable outlet flange (2.2).

8. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 7, characterized in that: The equipment fixing flange (3.2) includes a flange plate, an electrical equipment blind flange (3.2.2), and an equipment mounting bracket (3.2.1). The equipment mounting bracket (3.2.1) is connected to the electrical equipment blind flange (3.2.2). The cable bus outlet flange (3.1) includes a flange plate and a bus outlet blind flange. The bus outlet blind flange includes a perforated blind flange, a steel pipe welded to the blind flange, and a multi-core signal cable running through the steel pipe.

9. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 1, characterized in that: The corrosion protection system includes sacrificial anodes (4) installed on the monitoring unit (1) and the sealed chamber (2) as well as a corrosion protection layer on the entire surface of the device.

10. The underwater pipeline corrosion monitoring device based on field fingerprinting method according to claim 1, characterized in that: A protective cover (5) is provided outside the electrical equipment compartment (3). The protective cover (5) includes a top plate and a side plate. Multiple flow guide holes are designed on the side plate. The lower part of the side plate is connected to the sealed compartment (2).

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