CN114484288B - Intelligent pipeline leakage monitoring system based on sensitized fiber grating and monitoring method thereof - Google Patents
Intelligent pipeline leakage monitoring system based on sensitized fiber grating and monitoring method thereof Download PDFInfo
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- CN114484288B CN114484288B CN202210030511.2A CN202210030511A CN114484288B CN 114484288 B CN114484288 B CN 114484288B CN 202210030511 A CN202210030511 A CN 202210030511A CN 114484288 B CN114484288 B CN 114484288B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
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Abstract
The invention discloses an intelligent pipeline leakage monitoring system based on sensitized fiber gratings and a monitoring method thereof, wherein the system comprises a pipeline system and a fiber grating signal processing system, the pipeline system comprises a composite pipe and the sensitized fiber gratings penetrating through the wall of the composite pipe, and the sensitized fiber gratings are connected with a fiber grating temperature compensator; the sensitized fiber grating comprises an inner layer of the fiber grating and an outer coating layer of modified butyl rubber, the modified butyl rubber can swell after contacting hydrocarbon crude oil, and the fiber grating of the inner layer generates a swelling offset signal of Bragg wavelength, and the thermal expansion offset signal generated by temperature change of the fiber grating and the swelling offset signal generated by the swelling change are identified and processed by a fiber grating signal processing system. The system of the invention directly compounds the specific sensitized fiber grating with the inside of the oilfield pipe, does not need to additionally lay a monitoring pipeline, has rapid construction, has the protection of the oilfield pipe jacket layer, and can meet the long-term use requirement in the landfill environment.
Description
Technical Field
The invention belongs to the field of intelligent pipeline real-time monitoring of oilfield pipelines, and particularly relates to an intelligent pipeline leakage monitoring system based on sensitized fiber gratings and a monitoring method thereof.
Background
In the field of oilfield pipeline gathering and transportation, because pipelines are all operated at high pressure, a transportation medium is inflammable, explosive and toxic, once accidents occur, not only can resource loss and environmental pollution be caused, but also fire and explosion can be generated, huge economic loss is generated, and the surrounding environment and surrounding personal safety can be damaged. Therefore, an intelligent detection means is urgently needed to timely and accurately detect the change of the safety state of the pipeline, and the real-time on-line monitoring of the oil pipeline is particularly important. At present, in the field of oilfield pipes, there are two main types of leakage monitoring of pipelines: the electric signal monitoring and the optical signal monitoring are different in information transmission medium, but the leakage state is indirectly represented mainly by monitoring the temperature, pressure and other changes generated during leakage, and a reliable method and a system for directly representing the leakage state are lacked.
The prior art mainly has the following problems:
(1) The conventional electric signal detection mode is easy to interfere, long-distance signal attenuation is large, and the working condition requirements of high temperature and high pressure in an oil field cannot be met.
(2) Most of conventional optical signal detection modes are light intensity type and interference type, the light intensity type is easily influenced by factors such as fluctuation of a light source, bending loss of an optical fiber and the like, the interference type needs to detect change of interference fringes, and the interference fringes need to be clear, so that higher requirements are provided for stability of the light intensity of the light source.
The phenomenon of false alarm possibly caused by indirect characterization of parameters such as temperature and pressure is generated, because in actual engineering, the axial dimension of the buried gathering pipeline is relatively large, the environment is relatively complex, and some uncontrollable environmental factors exist to cause the change of parameters such as temperature. In the prior art, one or more monitoring pipelines are usually arranged outside the pipeline in a conventional leakage detection mode, special fixtures are needed for compounding the pipeline and the oilfield pipeline, the construction is complex, the monitoring pipelines on the outer layer are easily influenced or even destroyed by a long-term landfill environment, and the service life is short.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims to provide an intelligent pipeline leakage monitoring system based on sensitized fiber gratings and a monitoring method thereof.
The intelligent pipeline leakage monitoring system based on the sensitized fiber grating comprises a pipeline system and a fiber grating signal processing system, wherein the pipeline system comprises a composite pipe and the sensitized fiber grating axially penetrating through the wall of the composite pipe, the sensitized fiber grating is connected with a fiber grating temperature compensator, and the fiber grating temperature compensator is used for simulating a Bragg wavelength thermal expansion offset signal generated in a temperature environment where the sensitized fiber grating is positioned in the pipeline system; the sensitized fiber grating comprises a fiber grating and modified butyl rubber, wherein the fiber grating is coated by the modified butyl rubber, and the modified butyl rubber can be swelled after contacting hydrocarbon crude oil; fiber grating signals of the sensitized fiber grating and the fiber grating temperature compensator in the pipeline system are processed by a fiber grating signal processing system.
Further, the fiber grating signal processing system comprises an adjustable laser, a spectrum analyzer and an integrated host, wherein the offset signal of the fiber grating is identified and processed through the spectrum analyzer, and the identification and processing result is displayed on the integrated host.
Further, the fiber bragg grating temperature compensator comprises modified butyl rubber, a fiber bragg grating, an outer metal sleeve and a heating resistance wire, wherein the modified butyl rubber is coated outside the fiber bragg grating, the outer metal sleeve is arranged on the outer side of the modified butyl rubber in a sealing manner, and the heating resistance wire is arranged inside the outer metal sleeve and used for heating the outer metal sleeve; the outer metal sleeve is provided with two through holes for the two ends of the heating resistance wire to penetrate out and be connected with a power supply.
Further, the fiber bragg grating temperature compensator further comprises an epoxy resin sealing sleeve and an aluminum pipe, wherein a screw cap is arranged at the end part of the outer metal sleeve, a male thread for being matched with the connecting screw cap is arranged on the outer side of the aluminum pipe, the aluminum pipe is sleeved on the outer side of the modified butyl rubber, the outer metal sleeve is connected with the aluminum pipe through the screw cap, and the epoxy resin sealing sleeve is tightly and fixedly arranged between the outer metal sleeve and the modified butyl rubber.
Further, the material formula of the modified butyl rubber comprises the following components in parts by weight:
70-80 parts of butyl rubber;
15-20 parts of PE100 high-density polyethylene;
2-5 parts of talcum powder;
1-2 parts of carbon black;
1-2 parts of dioctyl ester;
3300.5-1 parts of an antioxidant.
In the pipeline monitoring method of the intelligent pipeline leakage monitoring system based on the sensitized fiber grating, in the sensitized fiber grating in the pipeline system, the coated modified butyl rubber can swell after contacting hydrocarbon crude oil and the fiber grating in the inner layer of the modified butyl rubber can generate a swelling offset signal of Bragg wavelength; the sensitized fiber grating in the pipeline system can generate two signals, namely a thermal expansion offset signal generated by temperature change and a swelling offset signal generated by swelling change, wherein the total signal of the two signals is marked as X, and the signal X is identified and processed by a fiber grating signal processing system;
meanwhile, a fiber bragg grating temperature compensator connected with a sensitized fiber bragg grating in a pipeline system simulates the temperature environment in which the fiber bragg grating temperature compensator is positioned, a thermal expansion offset signal generated by the fiber bragg grating temperature compensator is marked as Y, and the signal Y is identified and processed by a fiber bragg grating signal processing system; and judging whether hydrocarbon crude oil leakage occurs in the pipeline system or not by analyzing the difference between the signal X and the signal Y.
Further, the processing formula of the intelligent pipeline leakage monitoring system based on the sensitized fiber grating is as follows:
in the above formula, lambda B For a Bragg wavelength unstrained at the calibration temperature, deltalambda B A total wavelength shift amount that causes a Bragg wavelength for both the thermal expansion shift signal and the swelling shift signal; ke is a strain coefficient and is a constant used for measuring the swelling capacity of the fiber bragg grating in the hydrocarbon crude oil environment due to swelling change; k (K) T The temperature coefficient is a constant and is used for measuring the offset of the Bragg wavelength generated by temperature change; Δt represents the temperature difference between the test temperature and the calibration temperature; epsilon is the swelling elongation of the fiber bragg grating in the hydrocarbon crude oil environment due to the swelling change, when epsilon=0, no leakage signal of the leaked hydrocarbon crude oil is shown in the pipeline system, and when epsilon is more than 0, the leakage signal of the leaked hydrocarbon crude oil is shown in the pipeline systemNumber (x).
Compared with the prior art, the invention has the beneficial effects that:
(1) The fiber bragg gratings are wavelength modulation sensors, have strong multiplexing capability, and the measuring signals are not influenced by factors such as optical fiber bending loss, continuous loss, light source fluctuation and the like, can meet extreme working condition conditions used in the field of oilfield pipes, and can realize quasi-distributed measurement on the long-distance conveying scale of oilfield pipes by connecting a plurality of Bragg gratings in series on one optical fiber.
(2) The invention relates to a sensitized fiber grating, namely a specific sensitized fiber grating sensor, wherein the external packaging material of the fiber grating is modified butyl rubber mainly through a specific sensitization and packaging technology, and the fiber grating can generate reversible swelling phenomenon in crude oil (hydrocarbon) environment, so that the internal Bragg grating generates offset to measure leakage signals, the leakage state is directly represented by detection of hydrocarbon substances, and the influence of most other interference factors is immunized. Moreover, the swelling deviation is much larger than the thermal expansion deviation generated by temperature change, the error is smaller, and a temperature compensator is also added in the monitoring system of the invention to further optimize the measurement accuracy.
(3) In the monitoring system, the specific sensitized fiber grating is directly compounded with the inside of the oilfield pipe, a monitoring pipeline is not required to be additionally laid, the construction is rapid, the oilfield pipe is protected by an outer jacket layer, the monitoring system can isolate the influence of most external interference factors while working together with the oilfield pipe, and the long-term use requirement under the landfill environment can be met.
Drawings
FIG. 1 is a schematic diagram of the entire system of an intelligent pipeline leakage monitoring system based on sensitized fiber gratings;
FIG. 2 is a schematic diagram of a fiber grating temperature compensator according to the present invention;
FIG. 3 is a schematic view of the piping system of the present invention;
FIG. 4 is a graph showing the elongation versus treatment time for two stages of soaking in hydrocarbon crude oil and drying from hydrocarbon crude oil for a modified butyl rubber tube according to the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples, but the scope of the invention is not limited thereto.
Examples: reference is made to FIGS. 1-3
The intelligent pipeline leakage monitoring system based on the sensitized fiber grating comprises a pipeline system and a fiber grating signal processing system, wherein the pipeline system comprises a composite pipe and the sensitized fiber grating 8 axially penetrating the pipe wall of the composite pipe, the sensitized fiber grating 8 is connected with a fiber grating temperature compensator, the fiber grating temperature compensator is used for simulating a Bragg wavelength thermal expansion offset signal generated in the pipeline system under the temperature environment of the sensitized fiber grating 8, and the thermal expansion offset signal generated by the temperature change of the fiber grating is identified and processed by the fiber grating signal processing system; the sensitized fiber grating 8 comprises an inner layer of the fiber grating and an outer coating layer of modified butyl rubber, the modified butyl rubber of the outer coating layer can swell after contacting hydrocarbon crude oil, and the fiber grating of the inner layer generates a swelling offset signal of Bragg wavelength, and the thermal expansion offset signal generated by temperature change of the fiber grating and the swelling offset signal generated by swelling change are identified and processed by a fiber grating signal processing system.
The fiber grating signal processing system comprises an adjustable laser, a spectrum analyzer and an integrated host, wherein the offset signal of the fiber grating is identified and processed through the spectrum analyzer, and the identification and processing result is displayed on the integrated host.
In contrast to fig. 1, the monitoring system of the present invention is mainly composed of five major parts: piping, temperature compensators, tunable lasers, spectrum analyzers and integrated hosts, the overall system being schematically shown in fig. 1. The whole system adopts a modularized design, is convenient for installation and fault investigation, wherein the adjustable laser generates a stable laser light source, the laser safety level meets the Class1 level of IEC60825-1 (2007), and the highest laser level is achieved, so that the system has no harm to human eyes. The tunable laser is a signal transmitter that processes a signal by receiving a signal echo after transmitting the signal.
The spectrum analyzer has the main functions of identifying and processing offset signals of the fiber gratings, providing a visual display interface of an image, mapping the fiber positions to the image through the graphic configuration module, and directly displaying alarm information on the image once an alarm occurs at a certain point of the fiber, so that the image is visual.
Fig. 2 is a schematic structural diagram of a fiber grating temperature compensator (abbreviated as temperature compensator), in which a sensitized fiber grating is composed of two parts: an outer cladding layer of modified butyl rubber 6 and an inner layer of fiber grating 7. The modified butyl rubber is a mixed material obtained by mixing butyl rubber matrix with PE 100-grade resin, adding partial modifier and inorganic filler, and extruding by high-temperature double screws. The modified butyl rubber has unique hydrocarbon substance sensitization effect, can be repeatedly used in a reversible swelling phenomenon in a crude oil environment, ensures the physical bonding strength and chemical compatibility of the butyl rubber with a glue layer and each structural layer of the pipe in the pipe processing process, ensures the flexibility of the optical fiber and simultaneously enhances the mechanical strength by adding the inorganic filler, and has the main components as shown in the following formula:
70-80 parts of butyl rubber;
15-20 parts of PE100 high-density polyethylene;
2-5 parts of talcum powder;
1-2 parts of carbon black;
1-2 parts of dioctyl ester;
3300.5-1 parts of an antioxidant.
In the material formula of the modified butyl rubber, talcum powder is an inorganic filler, butyl rubber is a main material, and the balance is a modifier.
In contrast to fig. 2, the fiber grating temperature compensator includes a modified butyl rubber 6, a fiber grating 7, an outer metal sleeve 1 and a heating resistance wire 2, wherein the modified butyl rubber 6 is coated outside the fiber grating 7, the outer metal sleeve 1 is arranged on the outer side of the modified butyl rubber 6 in a sealing manner, and the heating resistance wire 2 is arranged inside the outer metal sleeve 1 for heating the same; two through holes are formed in the outer metal sleeve 1 so that two sections of the heating resistance wire 2 penetrate out to be connected with a power supply. The heating resistance wire 2 is used for realizing temperature compensation of the petroleum pipeline under the high-temperature working condition.
Further, the fiber bragg grating temperature compensator further comprises an epoxy resin sealing sleeve 3 and an aluminum pipe 4, a screw cap 5 is arranged at the end part of the outer metal sleeve 1, a male thread for being matched with the connecting screw cap 5 is arranged on the outer side of the aluminum pipe 4, the aluminum pipe 4 is sleeved on the outer side of the modified butyl rubber 6, the outer metal sleeve 1 is connected with the aluminum pipe 4 through the screw cap 5, and the epoxy resin sealing sleeve 3 is tightly and fixedly arranged between the outer metal sleeve 1 and the modified butyl rubber 6.
The principal principle of the fiber bragg grating 7 is that the strain of the fiber bragg grating in the axial direction causes the bragg wavelength passing through the grating to change, and an optical signal is generated and received and processed by a spectrum analyzer.
In a sensitized fiber grating 8 in a pipeline system, the coated modified butyl rubber can swell after contacting hydrocarbon crude oil and enable the fiber grating in the inner layer to generate a swelling offset signal of Bragg wavelength; the sensitized fiber grating 8 in the pipeline system can generate two signals, namely a thermal expansion offset signal generated by temperature change and a swelling offset signal generated by swelling change, wherein the total signal of the two signals is marked as X, and the signal X is identified and processed by a fiber grating signal processing system; meanwhile, a fiber bragg grating temperature compensator connected with a sensitized fiber bragg grating 8 in a pipeline system simulates the temperature environment in which the fiber bragg grating temperature compensator is positioned, a thermal expansion offset signal generated by the fiber bragg grating temperature compensator is marked as Y, and the signal Y is identified and processed by a fiber bragg grating signal processing system; and judging whether hydrocarbon crude oil leakage occurs in the pipeline system or not by analyzing the difference between the signal X and the signal Y.
The processing formula of the system of the invention is as follows:
in the above formula, lambda B For a Bragg wavelength unstrained at the calibration temperature, deltalambda B Representing heatBoth the swelling shift signal and the swelling shift signal cause a total wavelength shift of the Bragg wavelength, the ratio of which is made up of two parts; ke represents a strain coefficient, which is a constant used for measuring the swelling capacity of the fiber bragg grating in the hydrocarbon crude oil environment due to swelling change; k (K) T The representative temperature coefficient is a constant for measuring the offset of the Bragg wavelength generated by temperature change; Δt represents the temperature difference between the test temperature and the calibration temperature. In the formula, epsilon represents the swelling elongation of the fiber bragg grating in the hydrocarbon crude oil environment due to swelling change, and when the calculated result epsilon=0, no leakage signal of the hydrocarbon crude oil is indicated in the pipeline system; when the calculated result epsilon is more than 0, the leakage signal of the leaked hydrocarbon crude oil exists in the pipeline system. The whole temperature compensation device is used for eliminating the measurement error of the temperature part, namely K in the formula T △T。
Fig. 3 is a schematic structural diagram of a pipeline system in which a pipeline is compounded with the specific sensitized optical fibers, wherein two optical fibers are arranged in parallel, and a single-fiber or multi-fiber pipeline compounding scheme can be adopted according to actual working conditions and cost budget requirements. The composite tube in fig. 3 comprises a pipeline inner layer 11, a reinforcing layer 10 and an outer sheath layer 9, and optical fibers are arranged between the reinforcing layer 10 and the outer sheath layer 9 of the composite tube, so that the optical fibers are matched during extrusion molding of the composite tube. For bonded pipelines (such as steel wire composite pipes), the grafting effect of the hot melt adhesive layer and the modified butyl rubber can ensure enough bonding strength, and for non-bonded pipelines (such as polyester composite pipes), the optical fibers and the reinforcing layer are preferably driven into the spike teeth to be fixed at a distance from one end.
In contrast to fig. 3, a branch pipe 12 is connected from the side of the sensitized fiber grating 8, the branch pipe 12 is an integral structure of coating the fiber grating 7 with the modified butyl rubber 6 as in fig. 2, that is, an integral structure of forming the whole structure (i.e. a fiber grating temperature compensator) as shown in fig. 2 by assembling the outer metal sleeve 1, the heating resistance wire 2, the epoxy resin sealing sleeve 3, the aluminum pipe 4 and the nut 5 on the branch pipe 12, and realizing the installation structure of the fiber grating temperature compensator in the temperature environment where the sensitized fiber grating 8 is located in the analog pipeline system.
Example 1:
the material formula of the modified butyl rubber comprises the following components in parts by weight:
75 parts of butyl rubber;
18 parts of PE100 high-density polyethylene;
3 parts of talcum powder;
1.5 parts of carbon black;
1.5 parts of dioctyl ester;
3300.7 parts of an antioxidant.
And (3) melting and extruding the formula raw materials of the modified butyl rubber by using a single screw extruder, wherein the temperature of a machine barrel area is 190 ℃, the temperature of a die head area is 195 ℃, and then carrying out vacuum sizing and cooling to obtain the modified butyl rubber tube. In the material formula of the modified butyl rubber, the inorganic filler and the modifier are added, so that the modified butyl rubber has a certain stiffening effect, the elastic modulus is about 950MPa, the elongation at break is about 90%, and the use requirement can be met. The temperature-induced change in elongation of the modified butyl rubber is also small, with an elongation of only about 4% at 95 ℃.
Swelling test of modified butyl rubber tube in hydrocarbon crude oil: the relationship between the pipe elongation and the soaking time of the hydrocarbon crude oil extracted from five factories of Changqing oilfield is shown in fig. 4 when the modified butyl rubber pipe is soaked in the hydrocarbon crude oil. It can be seen that the linear expansion saturation is achieved after soaking in hydrocarbon material for about 24 hours, and the elongation is about 55%. And then the pipeline is taken out from the hydrocarbon crude oil for drying, the drying stage is the recovery stage, and the drying is gradually recovered after 60 hours.
In contrast, when a conventional butyl rubber tube was used as a control experiment, the conventional butyl rubber tube was immersed in the above hydrocarbon crude oil for 24 hours, and the elongation thereof was only 30% or less.
What has been described in this specification is merely an enumeration of possible forms of implementation for the inventive concept and may not be considered limiting of the scope of the present invention to the specific forms set forth in the examples.
Claims (6)
1. The intelligent pipeline leakage monitoring system based on the sensitized fiber grating is characterized by comprising a pipeline system and a fiber grating signal processing system, wherein the pipeline system comprises a composite pipe and the sensitized fiber grating (8) axially penetrating the pipe wall of the composite pipe, the sensitized fiber grating (8) is connected with a fiber grating temperature compensator, and the fiber grating temperature compensator is used for simulating a Bragg wavelength thermal expansion offset signal generated in a temperature environment where the sensitized fiber grating (8) is positioned in the pipeline system; the sensitized fiber grating (8) comprises a fiber grating and modified butyl rubber, wherein the fiber grating is coated by the modified butyl rubber, and the modified butyl rubber can be swelled after contacting hydrocarbon crude oil; fiber grating signals of the sensitized fiber grating (8) and the fiber grating temperature compensator in the pipeline system are processed by a fiber grating signal processing system;
the fiber grating signal processing system comprises an adjustable laser, a spectrum analyzer and an integrated host, wherein the offset signal of the fiber grating is identified and processed through the spectrum analyzer, and the identification and processing result is displayed on the integrated host.
2. The intelligent pipeline leakage monitoring system based on the sensitized fiber grating according to claim 1, wherein the fiber grating temperature compensator comprises modified butyl rubber (6), a fiber grating (7), an outer metal sleeve (1) and a heating resistance wire (2), the modified butyl rubber (6) is coated on the outer part of the fiber grating (7), the outer metal sleeve (1) is arranged on the outer side of the modified butyl rubber (6) in a sealing mode, and the heating resistance wire (2) is arranged inside the outer metal sleeve (1); two through holes are formed in the outer metal sleeve (1) and are used for penetrating out of two ends of the heating resistance wire (2) to be connected with a power supply.
3. The intelligent pipeline leakage monitoring system based on the sensitized fiber grating according to claim 2, wherein the fiber grating temperature compensator further comprises an epoxy resin sealing sleeve (3) and an aluminum pipe (4), a screw cap (5) is arranged at the end part of the outer metal sleeve (1), a male thread for being matched with the connecting screw cap (5) is arranged on the outer side of the aluminum pipe (4), the aluminum pipe (4) is sleeved on the outer side of the modified butyl rubber (6), the outer metal sleeve (1) is connected with the aluminum pipe (4) through the screw cap (5), and the epoxy resin sealing sleeve (3) is fixedly arranged between the outer metal sleeve (1) and the modified butyl rubber (6).
4. The intelligent pipeline leakage monitoring system based on the sensitized fiber grating according to claim 1, wherein the material formula of the modified butyl rubber comprises the following components in parts by weight:
70-80 parts of butyl rubber;
15-20 parts of PE100 high-density polyethylene;
2-5 parts of talcum powder;
1-2 parts of carbon black;
1-2 parts of dioctyl ester;
3300.5-1 parts of an antioxidant.
5. A pipeline monitoring method based on the intelligent pipeline leakage monitoring system based on the sensitized fiber grating according to claim 1, which is characterized in that in the sensitized fiber grating (8) in the pipeline system, the coated modified butyl rubber can swell after contacting hydrocarbon crude oil and the fiber grating in the inner layer can generate a swelling offset signal of Bragg wavelength; the sensitized fiber grating (8) in the pipeline system can generate two signals, namely a thermal expansion offset signal generated by temperature change and a swelling offset signal generated by swelling change, the total signal of the two signals is marked as X, and the signal X is identified and processed by a fiber grating signal processing system;
meanwhile, a fiber bragg grating temperature compensator connected with a sensitized fiber bragg grating (8) in the pipeline system simulates the temperature environment in which the fiber bragg grating temperature compensator is positioned, a thermal expansion offset signal generated by the fiber bragg grating temperature compensator is marked as Y, and the signal Y is identified and processed by a fiber bragg grating signal processing system;
and judging whether hydrocarbon crude oil leakage occurs in the pipeline system or not by analyzing the difference between the signal X and the signal Y.
6. The method for monitoring the pipeline of the intelligent pipeline leakage monitoring system based on the sensitized fiber grating according to claim 5, wherein,
the processing formula of the thermal expansion offset signal and the swelling offset signal generated by the swelling change is as follows:
in the above formula, lambda B For a Bragg wavelength unstrained at the calibration temperature, deltalambda B A total wavelength shift amount that causes a Bragg wavelength for both the thermal expansion shift signal and the swelling shift signal; ke is a strain coefficient and is a constant used for measuring the swelling capacity of the fiber bragg grating in the hydrocarbon crude oil environment due to swelling change; k (K) T The temperature coefficient is a constant and is used for measuring the offset of the Bragg wavelength generated by temperature change; Δt represents the temperature difference between the test temperature and the calibration temperature; and epsilon is the swelling elongation of the fiber bragg grating in the hydrocarbon crude oil environment due to swelling change, when epsilon=0, the fiber bragg grating indicates that no leakage signal of the hydrocarbon crude oil leaks in the pipeline system, and when epsilon is more than 0, the fiber bragg grating indicates that the leakage signal of the hydrocarbon crude oil leaks in the pipeline system.
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