CN105509979B - Monitoring leak from oil gas pipe positioning system and method based on optical fiber suction wave - Google Patents
Monitoring leak from oil gas pipe positioning system and method based on optical fiber suction wave Download PDFInfo
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- CN105509979B CN105509979B CN201610016822.8A CN201610016822A CN105509979B CN 105509979 B CN105509979 B CN 105509979B CN 201610016822 A CN201610016822 A CN 201610016822A CN 105509979 B CN105509979 B CN 105509979B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 45
- 239000013307 optical fiber Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 111
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 29
- 238000004891 communication Methods 0.000 claims description 20
- 230000004807 localization Effects 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 42
- 239000003921 oil Substances 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2892—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for underground fuel dispensing systems
Abstract
The present invention relates to oil and gas pipeline leakage detection fields, it discloses monitoring leak from oil gas pipe positioning systems and method based on optical fiber suction wave, the system includes at least two fiber bragg grating pressure sensors, and each fiber bragg grating pressure sensor is respectively arranged in oil-gas pipeline predetermined position；The fiber bragg grating pressure sensor is attached in a manner of in parallel or series, and the oil-gas pipeline internal negative pressure wave signal for being used to will test is converted to optical signal, and is sent to fiber grating fast demodulation instrument；The fiber grating fast demodulation instrument is used to synchronous acquisition and transmits the optical signal to monitoring host be analyzed and processed, the final leak detection and accurate positioning for realizing oil-gas pipeline.The present invention does not need in addition to be laid with transmission cable, suction wave velocity of wave can be accurately obtained in real time, greatly enhances the monitoring capability to Small leak, and takes the average value of multiple groups measurement result, it can further improve positioning accuracy, have the advantages that detection sensitivity is high, positioning accuracy height is low with rate of false alarm etc..
Description
Technical field
The present invention relates to a kind of leakage positioning system more particularly to a kind of gas oil pipe leakage prisons based on optical fiber suction wave
Measure position system and method.
Background technique
Oil-gas pipeline is important petroleum, natural gas transportation mode, and Chinese Petroliferous pipeline total kilometrage is up to 140,000 public affairs at present
In, carry the crude oil in China 70% and 99% natural gas transportation task.Data show that China's oil-gas pipeline accident rate is average
For 3 times/1000 km years, much higher than 0.5 time/1000 km years in the U.S. and 0.25 time/1000 km years in Europe.
According to statistics, the main reason for causing China's oil-gas pipeline accident is the drilling hole of oil stolen (gas) of artificial damage from third-party and malice, with
And corrosive pipeline and Sudden Natural Disasters.Therefore, real-time monitoring pipeline is leaked and is accurately positioned to leakage point, to guarantee
People's property, personal safety reduce national economy loss and are of great significance.
Existing Discussion on Pipe Leakage Detection Technology specifically includes that flow equilibrium method, interior survey ball, negative pressure wave method, distributed light
Nanofarads, pressure gradient method etc..Wherein negative pressure wave method installs pressure sensor only by pipeline first and last end respectively, realizes letter
It is single, easy to maintain, and much it has been applied to the leakage monitoring of practical pipeline.From the point of view of running situation, detection spirit
Sensitivity is low, poor positioning accuracy is the current bottleneck for restricting the development of suction wave leak detection technology.It is let out using negative pressure wave method
It needs to solve leakage point position by suction wave velocity of wave when leakage positioning, and the spread speed of suction wave and pipeline transmission medium are special
Property, the factors such as pipe material it is related, so to carry out the leakage positioning of pipeline accurately it is necessary to first determine that suction wave is propagated in pipeline
Speed, be brought directly to nominal suction wave value of wave speed and carry out leakage location Calculation, will lead to leakage positioning accuracy it is lower；And
Negative pressure wave signal will appear deep fades in transmission process, and with the extension of transmission range, the pressure of pipeline head and end is passed
Sensor, which is likely to occur, is not measured suction wave, causes partial compromise operating condition that can not detect；Once in addition two of pipeline first and last end
One of failure of pressure sensor just will be unable to obtain the time difference that suction wave travels to pipeline head and end, this will lead
Cause leakage positioning failure.
Summary of the invention
The object of the present invention is to provide a kind of monitoring leak from oil gas pipe positioning system and method based on optical fiber suction wave,
The present invention can overcome above-mentioned deficiency, reach higher detection sensitivity and positioning accuracy, extremely low rate of false alarm.
To achieve the above object, the invention adopts the following technical scheme:
A kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave, including at least two fiber grating pressure
Sensor, each fiber bragg grating pressure sensor are respectively arranged in oil-gas pipeline predetermined position；The fiber grating pressure
Force snesor is attached in a manner of in parallel or series, and the oil-gas pipeline internal negative pressure wave signal for being used to will test is converted to
Optical signal, and it is sent to fiber grating fast demodulation instrument；The fiber grating fast demodulation instrument is for synchronous acquisition and transmits institute
It states optical signal to monitoring host to be analyzed and processed, the final leak detection and accurate positioning for realizing oil-gas pipeline.
The fiber bragg grating pressure sensor is connected in parallel to the multi-core mono-mode fiber of communications optical cable, the multicore single mode light
Fibre is connected with splitter, and the splitter is connected with fiber grating fast demodulation instrument.
The fiber bragg grating pressure sensor is connected to a core single mode optical fiber of communications optical cable, the core single-mode optics
Fibre is connected with fiber grating fast demodulation instrument.
The monitoring host is equipped with communication interface, and the communication interface is connected with fiber grating fast demodulation instrument.
The communication interface uses Ethernet interface.
The fiber bragg grating pressure sensor is installed on oil-gas pipeline at equal intervals.
The fiber bragg grating pressure sensor is installed on oil-gas pipeline according to default unequal interval distance.
A kind of localization method of the monitoring leak from oil gas pipe positioning system based on optical fiber suction wave, comprising:
Step (1): sentenced according to the negative pressure wave signal variation in the oil-gas pipeline that fiber bragg grating pressure sensor detects
Whether the break oil-gas pipeline region of fiber bragg grating pressure sensor covering leaks, if leaking, into next
Step；Otherwise, fiber bragg grating pressure sensor continues to test the negative pressure wave signal in oil-gas pipeline；
Step (2): according to fiber bragg grating pressure sensor transmission come pipeline pressure variation or pressure inflection point time into
Row slightly sentences the position of leakage point；
Step (3): to be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point,
And taking other fiber bragg grating pressure sensors in the determined leakage point the same side of step (2) is terminal, according to starting point and end
Point spacing and receive the pressure change of negative pressure wave signal or the time difference of pressure inflection point, determine suction wave propagate speed
Degree；
Step (4): to be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point,
One group is formed with the symmetrical other side difference fiber bragg grating pressure sensor of step (2) determined leakage point respectively, calculates and lets out
Several groups distance value between leak source and starting point is sought the average value of these group of distance value as final leakage point position, is realized
The accurate positioning of pipe leakage.
In the step (1), judge whether the oil-gas pipeline region of the fiber bragg grating pressure sensor covering lets out
The method of leakage are as follows:
When all fiber bragg grating pressure sensors monitor that the pressure in oil-gas pipeline is constant or pressure inflection point is not present,
Monitoring host judges that the oil-gas pipeline region of all fiber bragg grating pressure sensor coverings does not leak；
When single optical fiber grating pressure sensor monitors pressure change in oil-gas pipeline or there are when pressure inflection point, prison
It surveys host and judges that the oil-gas pipeline region of single optical fiber grating pressure sensor covering does not leak；
When multiple fiber bragg grating pressure sensors monitor pressure change or pass there are host judgement when pressure inflection point, is monitored
The oil-gas pipeline region that sensor is covered leaks.
In the step (2), the position for slightly sentencing leakage point is the pressure change or pressure inflection point for monitoring suction wave earliest
Between two adjacent fiber bragg grating pressure sensors of signal.
The invention has the benefit that
It is an advantage of the invention that by negative pressure wave signal by between the time difference of two fiber bragg grating pressure sensors and distance
Every can accurately obtain suction wave velocity of wave in real time；Multiple fiber grating pressure are laid by spaced apart on long distance pipeline
Sensor monitors negative pressure wave signal, is greatly improved the signal-to-noise ratio that sensor receives signal, enhances the monitoring capability to Small leak,
Negative pressure wave signal long distance transmission is avoided to decay the excessive deficiency for causing to leak positioning accuracy difference, and the present invention is by pipeline edge
The communications optical cable of line does not need in addition to be laid with transmission cable as transmission medium；The average value for taking multiple groups measurement result simultaneously, can
Positioning accuracy is further increased, has the advantages that detection sensitivity is high, positioning accuracy height is low with rate of false alarm etc..
Detailed description of the invention
Fig. 1 is the monitoring leak from oil gas pipe positioning system structure schematic illustration of the invention based on optical fiber suction wave；
Fig. 2 (a) is that sensor of the invention and communications optical cable are connected in parallel figure；
Fig. 2 (b) is sensor of the invention and communications optical cable series connection figure；
Fig. 3 is optical fiber suction wave monitoring leak from oil gas pipe localization method flow chart of the invention.
In figure, 1. fiber bragg grating pressure sensors；2. communications optical cable；3. splitter；4. fiber Bragg grating (FBG) demodulator；5. monitoring
Host；6. oil-gas pipeline.
Specific embodiment
The present invention will be further described with embodiment with reference to the accompanying drawing:
Fig. 1 is the structural schematic diagram of the monitoring leak from oil gas pipe positioning system of the invention based on optical fiber suction wave, should
Positioning system includes at least two fiber bragg grating pressure sensors 1, and the fiber bragg grating pressure sensor 1 is respectively arranged in oil gas
Pipeline predetermined position；The fiber bragg grating pressure sensor 1 is for perceiving 6 internal negative pressure wave signal of oil-gas pipeline, negative pressure
Wave signal is converted to optical signal, and is believed the 6 internal negative pressure glistening light of waves of oil-gas pipeline received by communications optical cable 2 and splitter 3
Number it is transferred to fiber grating fast demodulation instrument 4, the simultaneously and rapidly acquisition of signal is realized by fiber grating fast demodulation instrument 4, and passed
It send to monitoring host 5 and is analyzed and processed, the final leak detection and accurate positioning for realizing oil-gas pipeline.
Fiber bragg grating pressure sensor 1 can be installed at equal intervals, can also be installed according to on-site actual situations by different interval,
The installation site and sensor distance of each fiber bragg grating pressure sensor 1 need to be recorded.
Fiber bragg grating pressure sensor 1 is connected to splitter 3, and there are two types of forms:
(1) fiber bragg grating pressure sensor 1 is connected in parallel to the multi-core mono-mode fiber of communications optical cable 2, the multicore single mode
Optical fiber is connected to splitter 3, as shown in Fig. 2 (a).
(2) fiber bragg grating pressure sensor 1 is connected to a core single mode optical fiber of communications optical cable 2, a core single mode optical fiber
It is connected directly to fiber grating fast demodulation instrument, as shown in Fig. 2 (b).
Wherein, monitoring host 5 is equipped with communication interface, and the communication interface is connected with fiber grating fast demodulation instrument 4.
The pressure measurement range of fiber bragg grating pressure sensor 1 in the present embodiment is 0-10MPa, and sensitivity is better than
0.5%FS, response time < 10ms；Communication interface uses 100M Ethernet interface.
Fiber Bragg grating (FBG) demodulator 4 uses the 8 channel 1kHz high-speed light of GC-97001C-8 type of Zhuhai Guang Chen Science and Technology Ltd.
Fine grating demodulation instrument, each channel can connect the fiber bragg grating pressure sensor 1 of multiple parallel connections by splitter 3, can also connect
Connect multiple 1 arrays of concatenated fiber bragg grating pressure sensor；Each channel fiber grating pressure that fiber Bragg grating (FBG) demodulator 4 collects
1 monitoring data of force snesor are sent to monitoring host 5 by Ethernet interface, are analyzed by monitoring host 5 and determine the accurate of leakage point
Position.
Monitoring leak from oil gas pipe positioning system principle based on optical fiber suction wave of the invention are as follows:
When pipeline leaks, pipeline inside and outside differential pressure becomes larger, and fluid is lost rapidly, and leakage point adjacent area fluid density subtracts
Small, pressure reduction, this pressure downward trend are gradually spread to pipe ends, form suction wave.Pacify respectively along pipeline
Fiber bragg grating pressure sensor is filled, leakage point is different, and it is also different that suction wave reaches pressure at two ends sensor time difference.According to the time
Difference, duct length, negative pressure velocity of wave propagation, can be realized the positioning of pipe leakage point.
Its ranging formula are as follows:
Wherein: v is the spread speed of suction wave in the duct；
Δ t is that two test points receive the pressure change of negative pressure wave signal or the time difference of pressure inflection point；
Δ L is two test points duct length detected.
As shown in figure 3, the localization method of the monitoring leak from oil gas pipe positioning system of the invention based on optical fiber suction wave,
Including the following steps:
Step (1): the variation of the negative pressure wave signal in oil-gas pipeline detected according to fiber bragg grating pressure sensor come
Judge whether the oil-gas pipeline region of the fiber bragg grating pressure sensor covering leaks, if leaking, under entering
One step；Otherwise, fiber bragg grating pressure sensor continues to test the negative pressure wave signal in oil-gas pipeline；
Step (2): according to fiber bragg grating pressure sensor transmission come negative pressure wave signal pressure change or pressure inflection point
Time carry out slightly sentencing the position of leakage point；
Step (3): to be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point,
And taking other fiber bragg grating pressure sensors in the determined leakage point the same side of step (2) is terminal, according to starting point and end
Point separation delta L and receive the pressure change of negative pressure wave signal or the time difference of pressure inflection point, determine suction wave propagate
Speed；
Negative pressure velocity of wave propagationWherein, t1、t2Respectively leakage negative pressure wave signal reaches the 1st optical fiber light
The time of grid voltage force snesor and the 2nd fiber bragg grating pressure sensor；
Step (4): to be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point,
One group is formed with the symmetrical other side difference fiber bragg grating pressure sensor of step (2) determined leakage point respectively, calculates and lets out
Several groups distance value between leak source and starting point is sought the average value of these group of distance value as final leakage point position, is realized
The accurate positioning of pipe leakage.
Wherein, i-th of fiber bragg grating pressure sensor meter of starting point and step (2) symmetrical other side of determined leakage point
Distance value X between obtained leakage point and starting pointiExpression formula are as follows:
Wherein, Δ tiDetermine that i-th of fiber grating pressure of the symmetrical other side of leakage point passes by starting point and step (2)
Sensor receives the pressure change of negative pressure wave signal or the time difference of pressure inflection point；
ΔLiI-th of fiber bragg grating pressure sensor of the symmetrical other side of leakage point is determined by starting point and step (2)
Duct length detected, i are the positive integer more than or equal to 1.
Further, in step (1), judge whether the oil-gas pipeline region of the fiber bragg grating pressure sensor covering is sent out
The method of raw leakage are as follows:
When all fiber bragg grating pressure sensors monitor that the pressure in oil-gas pipeline is constant or pressure inflection point is not present,
Monitoring host judges that the oil-gas pipeline region of all fiber bragg grating pressure sensor coverings does not leak；
When single optical fiber grating pressure sensor monitors pressure change in oil-gas pipeline or there are when pressure inflection point, prison
It surveys host and judges that the oil-gas pipeline region of single optical fiber grating pressure sensor covering does not leak；
When multiple fiber bragg grating pressure sensors monitor pressure change or pass there are host judgement when pressure inflection point, is monitored
The oil-gas pipeline region that sensor is covered leaks.
Further, in step (2), the position for slightly sentencing leakage point is the pressure change or pressure for monitoring suction wave earliest
Between two adjacent fiber bragg grating pressure sensors of inflection point signal.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (9)
1. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave, which is characterized in that including at least two light
Fine grating pressure sensor, each fiber bragg grating pressure sensor are respectively arranged in oil-gas pipeline predetermined position；It is described
Fiber bragg grating pressure sensor is attached in a manner of in parallel or series, the oil-gas pipeline internal negative pressure wave for being used to will test
Signal is converted to optical signal, and is sent to fiber grating fast demodulation instrument；The fiber grating fast demodulation instrument is adopted for synchronizing
Collect and transmit the optical signal extremely monitoring host and be analyzed and processed, finally realizes the leak detection of oil-gas pipeline and accurately determine
Position；
The optical fiber is judged according to the variation of the negative pressure wave signal in the oil-gas pipeline that fiber bragg grating pressure sensor detects
Whether the oil-gas pipeline region of grating pressure sensor covering leaks, if leaking:
According to fiber bragg grating pressure sensor transmission come the pressure change of negative pressure wave signal or the time of pressure inflection point carry out it is thick
Sentence the position of leakage point, the position for sentencing leakage point roughly is the pressure change or pressure inflection point signal for monitoring suction wave earliest
Between two adjacent fiber bragg grating pressure sensors；
To be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point, and take in institute really
Other fiber bragg grating pressure sensors for determining leakage point the same side are terminal, according to the spacing of beginning and end and are received negative
The pressure change of wave signal or the time difference of pressure inflection point are pressed, determines negative pressure velocity of wave propagation；
To be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point, respectively with determine
The symmetrical other side difference fiber bragg grating pressure sensor of leakage point forms one group, calculates the several groups between leakage point and starting point
Distance value seeks the average value of these group of distance value as final leakage point position, realizes the accurate positioning of pipe leakage；
If not leaking, fiber bragg grating pressure sensor continues to test the negative pressure wave signal in oil-gas pipeline；
Wherein, judge the method whether the oil-gas pipeline region of the fiber bragg grating pressure sensor covering leaks are as follows:
When all fiber bragg grating pressure sensors monitor that the pressure in oil-gas pipeline is constant or pressure inflection point is not present, monitoring
Host judges that the oil-gas pipeline region of all fiber bragg grating pressure sensor coverings does not leak；
When single optical fiber grating pressure sensor monitors pressure change in oil-gas pipeline or there are when pressure inflection point, monitoring master
Machine judges that the oil-gas pipeline region of single optical fiber grating pressure sensor covering does not leak；
When multiple fiber bragg grating pressure sensors monitor pressure change or there are when pressure inflection point, monitoring host judges sensor
The oil-gas pipeline region covered leaks.
2. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave as described in claim 1, feature exist
Be connected in parallel to the multi-core mono-mode fiber of communications optical cable in, the fiber bragg grating pressure sensor, the multi-core mono-mode fiber with
Splitter is connected, and the splitter is connected with fiber grating fast demodulation instrument.
3. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave as described in claim 1, feature exist
Be connected to a core single mode optical fiber of communications optical cable in, the fiber bragg grating pressure sensor, the core single mode optical fiber with
Fiber grating fast demodulation instrument is connected.
4. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave as described in claim 1, feature exist
In the monitoring host is equipped with communication interface, and the communication interface is connected with fiber grating fast demodulation instrument.
5. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave as claimed in claim 4, feature exist
In the communication interface uses Ethernet interface.
6. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave as described in claim 1, feature exist
In the fiber bragg grating pressure sensor is installed on oil-gas pipeline at equal intervals.
7. a kind of monitoring leak from oil gas pipe positioning system based on optical fiber suction wave as described in claim 1, feature exist
In the fiber bragg grating pressure sensor is installed on oil-gas pipeline according to default unequal interval distance.
8. it is a kind of based on as described in claim 1-7 is any based on the monitoring leak from oil gas pipe positioning system of optical fiber suction wave
Localization method characterized by comprising
Step (1): judged according to the variation of the negative pressure wave signal in the oil-gas pipeline that fiber bragg grating pressure sensor detects
Whether the oil-gas pipeline region of the fiber bragg grating pressure sensor covering leaks, if leaking, enters in next step；
Otherwise, fiber bragg grating pressure sensor continues to test the negative pressure wave signal in oil-gas pipeline；
Step (2): according to fiber bragg grating pressure sensor transmission come negative pressure wave signal pressure change or pressure inflection point when
Between carry out slightly sentencing the position of leakage point, the position for sentencing leakage point roughly is to monitor that the pressure change of suction wave or pressure turn earliest
Between two adjacent fiber bragg grating pressure sensors of point signal；
Step (3): it to be initially received the fiber bragg grating pressure sensor of pressure change or pressure inflection point signal as starting point, and takes
Other fiber bragg grating pressure sensors in the determined leakage point the same side of step (2) are terminal, according to beginning and end
Spacing and the pressure change of negative pressure wave signal or the time difference of pressure inflection point are received, determines negative pressure velocity of wave propagation；
Step (4): using the fiber bragg grating pressure sensor for being initially received pressure change or pressure inflection point signal as starting point, distinguish
One group is formed with the symmetrical other side difference fiber bragg grating pressure sensor of step (2) determined leakage point, calculates leakage point
Several groups distance value between starting point seeks the average value of these group of distance value as final leakage point position, realizes pipeline
The accurate positioning of leakage.
9. localization method as claimed in claim 8, which is characterized in that in the step (1), judge the fiber grating pressure
The method whether the oil-gas pipeline region of sensor covering leaks are as follows:
When all fiber bragg grating pressure sensors monitor that the pressure in oil-gas pipeline is constant or pressure inflection point is not present, monitoring
Host judges that the oil-gas pipeline region of all fiber bragg grating pressure sensor coverings does not leak；
When single optical fiber grating pressure sensor monitors pressure change in oil-gas pipeline or there are when pressure inflection point, monitoring master
Machine judges that the oil-gas pipeline region of single optical fiber grating pressure sensor covering does not leak；
When multiple fiber bragg grating pressure sensors monitor pressure change or there are when pressure inflection point, monitoring host judges sensor
The oil-gas pipeline region covered leaks.
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| CN106481989B (en) * | 2016-12-01 | 2019-06-25 | 山东省科学院激光研究所 | Pipeline leakage detection method and device |
| CN107917784B (en) * | 2017-11-16 | 2019-10-29 | 武汉理工大学 | A kind of pipeline road Oil Leakage Detecting system and its working method based on fiber grating |
| CN107989672A (en) * | 2017-12-31 | 2018-05-04 | 重庆小康工业集团股份有限公司 | Communicating pipe for Pcv valve |
| CN108443714B (en) * | 2018-04-09 | 2019-11-15 | 山东省科学院激光研究所 | Determine the method and device of pipe leakage |
| CN110132509A (en) * | 2019-05-30 | 2019-08-16 | 广州燃气集团有限公司 | A kind of buried pipeline breakage point positioning system and method |
| CN112082093A (en) * | 2020-08-31 | 2020-12-15 | 中国石油集团渤海钻探工程有限公司 | Oil gas high-pressure pipeline damage and leakage monitoring method |
| CN114366869B (en) * | 2022-01-17 | 2022-12-09 | 南方医科大学南方医院 | Negative pressure drainage system for abdominal operation |
| CN114963024A (en) * | 2022-04-11 | 2022-08-30 | 国家石油天然气管网集团有限公司 | Monitoring device and detection system for oil and gas pipeline and installation method of detection system |
| CN117307988B (en) * | 2023-11-30 | 2024-03-05 | 山东省科学院激光研究所 | Large dynamic optical fiber sensor and system for pipeline leakage detection |
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| CN1101914C (en) * | 2001-05-31 | 2003-02-19 | 山东新大通石油环保科技股份有限公司 | Transportation pipeline leakage monitoring and locating method and system |
| CN1228610C (en) * | 2003-06-18 | 2005-11-23 | 中国石油天然气集团公司 | Sensing and testing fiber grating system for oil and gas pipeline detection |
| CN102853261A (en) * | 2011-06-27 | 2013-01-02 | 国际商业机器公司 | Method and device for determining leakage amount of fluid in conveying pipeline |
| CN102997056B (en) * | 2011-09-14 | 2014-10-15 | 中国石油天然气集团公司 | Method for measuring distance between natural gas pipe leakage detecting sensors |
| CN103822097B (en) * | 2012-11-16 | 2016-11-16 | 国际商业机器公司 | The method and device of the velocity of wave of suction wave is estimated in fluid-transporting tubing |
| CN205280311U (en) * | 2016-01-11 | 2016-06-01 | 山东省科学院激光研究所 | Oil gas pipeline leak detection positioning system based on optic fibre rarefaction wave |
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