CN102788648A - Oil and gas condition monitoring system based on distributed optical fiber sensing network - Google Patents
Oil and gas condition monitoring system based on distributed optical fiber sensing network Download PDFInfo
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- CN102788648A CN102788648A CN2011101313828A CN201110131382A CN102788648A CN 102788648 A CN102788648 A CN 102788648A CN 2011101313828 A CN2011101313828 A CN 2011101313828A CN 201110131382 A CN201110131382 A CN 201110131382A CN 102788648 A CN102788648 A CN 102788648A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 46
- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 35
- 230000003287 optical effect Effects 0.000 claims description 18
- 230000001427 coherent effect Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract 2
- 239000003208 petroleum Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention discloses an oil and gas condition monitoring system based on a distributed optical fiber sensing network. The system is based on a distributed optical fiber sensing technology, an optical fiber brillouin scattering effect is sensitive to environmental temperature and pressure and has a characteristic of linear correlation with the environmental temperature and pressure, so that conditions of oil and gas temperature, pressure and the like can be monitored, the monitoring can be continuously distributed in space along a sensing optical fiber, and a distributed monitoring can be achieved. Compared with systems in prior art, the system has the advantages that various conditions can be monitored, the space continuous distributed monitoring can be achieved, and the like.
Description
Technical field
The present invention relates to the oil gas status monitoring field of petroleum and petrochemical industry, particularly utilize the distributing optical fiber sensing technology to carry out the system of oil gas status monitoring.
Background technology
In the petroleum and petrochemical industry field, the state of oil gas is monitored, be the important means that is related to safe operations such as production of hydrocarbons, conveying, accumulating, very crucial.Therefore, various kinds of sensors is widely used in the oil gas status monitoring.And because the industry characteristic of petroleum and petrochemical industry, these sensors all need be operated in the harsh environment of high temperature, high pressure, high corrosion mostly.And the sensor that is widely used at present is under harsh like this environment, often can not reliably working, and unstable properties and fragile, the life-span is short, though perhaps can be competent at, costs an arm and a leg.
Based on all kinds of Fibre Optical Sensors of optical fiber, be one type of emerging in recent years sensor.Owing to adopt optical fiber as sensor information; And optical fiber is under the environment of the peculiar high temperature of petroleum and petrochemical industry, high pressure, high corrosion; Still can keep stable properties; Therefore, the various kinds of sensors based on optical fiber can show excellent and reliable and stable performance usually in petroleum and petrochemical industry.
In the sensor based on optical fiber, fiber-optic grating sensor is the one type of sensor that is widely used.This sensor needs and will the fiber grating that specific wavelength has a high reflectance be scribed at above the optical fiber.And the reflection wavelength of fiber grating has the characteristic of linear dependence again with the temperature and pressure of fiber grating environment of living in.Therefore, when a wide spectrum light source process is fiber-optic illuminated on fiber grating,, just can measure the temperature and pressure of fiber grating present position through the light beam wavelength that the measuring optical fiber optical grating reflection is returned.Though have numerous sensor-based systems based on fiber grating to be suggested in the petroleum and petrochemical industry field, this type systematic can not be realized proper distributed sensing system.Have the place of fiber grating to carry out because sensing is only inscribed in optical fiber, the place that does not have a fiber grating then can't sensing, and therefore, monitoring spatially is discontinuously arranged, and can only accomplish the tandem monitoring of a plurality of discrete points at most.Because monitoring is spatially discontinuous, this just is difficult to avoided when monitoring, slip to some extent.
Therefore another kind of Fibre Optical Sensor then directly utilizes optical fiber as sensor information, and need not on optical fiber, to inscribe fiber grating, can accomplish monitoring continuous on the space, from but truly distributed optical fiber sensing system.In the petroleum and petrochemical industry field, people such as Dong Sushan, Guo's transhipment have proposed to utilize fiber grating and have combined this distributing optical fiber sensing technology of optical time domain reflection (OTDR) to carry out the sensor-based system of oil/gas pipe line warning in " alarm sensing system for distributed optical fiber oil and gas pipeline " Chinese invention patent (patented claim notification number CN200610015202.9).But this system is the Rayleigh scattering principle of optical fiber owing to what utilize, and fiber Rayleigh scattering is all insensitive to the temperature and pressure of environment, therefore can't accomplish the oil gas state, like the monitoring of oil gas temperature and pressure.
Summary of the invention
In order to overcome the deficiency of the existing sensing technology in oil gas status monitoring field, the purpose of this invention is to provide a kind of oil gas condition monitoring system based on the distributing optical fiber sensing network.
The object of the invention is realized through following technical scheme: a kind of oil gas condition monitoring system based on the distributing optical fiber sensing network; Form by high coherent length laser instrument (1), photo-coupler (2,12), electrooptic modulator (4), pulse signal source (3), image intensifer (5,8), optical circulator (6), sensor fibre (7), light scrambler (11), optoisolator (9), optical filter (10), photodetector (13) and signal processing unit (14); The coherent light that high coherent length laser instrument (1) sends is divided into two-way through photo-coupler (2); One the tunnel after electrooptic modulator (4) is by the output of pulse signal source (3) modulation; Behind image intensifer (5) and optical circulator (6), send into sensor fibre (7); Light scrambler (11) is then sent on another road; Sensor fibre is amplified (8) by another image intensifer everywhere behind the brillouin scattering signal process optical circulator (6) that the optical fiber Brillouin scattering effect reflects; After passing through optoisolator (9) and optical filter (10) filtering optical noise again; Together send into another one photo-coupler (12) with the output of light scrambler (11), the output of photo-coupler (12) is converted into electric signal by photodetector (13) and is admitted to signal processing unit (14) and receives and analyze, final environment temperature and the pressure state that obtains along the sensor fibre distributed throughout.
Wherein, the coherent length of high coherent length laser instrument (1) must be greater than 2 π times of tested distance.
Pulse signal source (3) must possess the adjustable pulse output function of pulsewidth, and minimum exportable pulse width should be at least 1ns simultaneously.
The frequency band of detection width of photodetector (13) should be at least greater than 12GHz.
The centre frequency of the passband of optical filter (10) should be at the frequency place of the following 10GHz of high coherent length laser instrument centre frequency, and the passband width is at least greater than 5GHz.
The present invention has the following advantages and technique effect with respect to prior art: the present invention directly uses ordinary optic fibre as sensor information, need not on optical fiber, to make fiber grating, therefore can the implementation space on continuous proper distributed monitoring.Simultaneously; Because the present invention has adopted the distributed sensing technology based on the optical fiber Brillouin scattering effect; And the optical fiber Brillouin scattering effect all has fabulous linear dependence characteristic to environment temperature and pressure; Therefore the present invention can realize distributed monitoring to temperature and pressure, satisfies distributed monitoring is carried out in the oil gas field to parameters such as oil gas state such as temperature and pressures demand.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of the oil gas condition monitoring system based on the distributing optical fiber sensing network of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but embodiment of the present invention is not limited thereto.
Embodiment
The principle of the invention is as shown in Figure 1.
(1) light source: the light () field of high coherent length laser instrument output is:
E＝E
0·exp(jω
0t)
Wherein, E
0Be light () amplitude, ω
0It is light () angular frequency.
(2) pulse signal of establishing pulse signal source output is p (t), and then high coherent length laser instrument output is after pulse signal modulation, and its light () is:
E＝E
0·[1+p(t)]·exp(jω
0t)，
(3) the high coherent length laser instrument output through pulse signal modulation is admitted to sensor fibre after amplifying; At sensor fibre along the line everywhere; Owing to receive the influence of optical fiber Brillouin scattering effect, part exports that light is reflected can transmitting terminal, and it along the back scattered everywhere light of optical fiber () is:
Wherein, z is that sensor fibre is along the line everywhere apart from the distance of sensor fibre starting point, v
gBe the velocity of propagation of light in optical fiber, α (z) is the amplitude fading factor that sensor fibre receives environment temperature and pressure influence everywhere, ω
BIt is optical fiber Brillouin scattering angle frequency with optical fiber environment temperature of living in and pressure correlation.
(4) after the output coupling of another road of back scattered everywhere light signal of optical fiber and high coherent length laser instrument after scrambler is disturbed partially, the photocurrent that on photodetector, forms is:
All the temperature and pressure with sensor fibre environment everywhere along the line is relevant with frequency for the amplitude of this photocurrent, through after the signal Processing of signal processing unit, just can be finally inversed by the sensor fibre temperature and pressure situation of environment everywhere along the line.
The present invention with ordinary optic fibre as sensor fibre; Need not on optical fiber, to inscribe sensors such as fiber grating; Utilize the optical fiber Brillouin scattering effect; Through measuring the sensor fibre amplitude and the frequency of optical fiber Brillouin scattered signal everywhere along the line, just can be finally inversed by the sensor fibre temperature and pressure situation of environment everywhere along the line.Because optical fiber Brillouin is scattered in optical fiber and all can takes place everywhere along the line, therefore measurement and monitoring result spatially be continuous distribution, that is to say the distributed optical fiber sensing system of saying so truly.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not limited by the examples; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. oil gas condition monitoring system based on the distributing optical fiber sensing network; It is characterized in that; Form by high coherent length laser instrument (1), photo-coupler (2,12), electrooptic modulator (4), pulse signal source (3), image intensifer (5,8), optical circulator (6), sensor fibre (7), light scrambler (11), optoisolator (9), optical filter (10), photodetector (13) and signal processing unit (14); The coherent light that high coherent length laser instrument (1) sends is divided into two-way through photo-coupler (2); One the tunnel after electrooptic modulator (4) is by the output of pulse signal source (3) modulation; Behind image intensifer (5) and optical circulator (6), send into sensor fibre (7); Light scrambler (11) is then sent on another road; Sensor fibre everywhere through brillouin scattering signal that the optical fiber Brillouin scattering effect reflects through optical circulator (6) back by another image intensifer amplification (8), pass through optoisolator (9) and optical filter (10) filtering optical noise again after, together send into another one photo-coupler (12) with the output of light scrambler (11); The output of photo-coupler (12) is converted into electric signal by photodetector (13) and is admitted to signal processing unit (14) and receives and analyze, final environment temperature and the pressure state that obtains along the sensor fibre distributed throughout.
2. a kind of oil gas condition monitoring system based on the distributing optical fiber sensing network according to claim 1 is characterized in that, the coherent length of high coherent length laser instrument (1) must be greater than 2 π times of tested distance.
3. a kind of oil gas condition monitoring system based on the distributing optical fiber sensing network according to claim 1 is characterized in that pulse signal source (3) must possess the adjustable pulse output function of pulsewidth, and minimum exportable pulse width should be at least 1ns simultaneously.
4. a kind of oil gas condition monitoring system based on the distributing optical fiber sensing network according to claim 1 is characterized in that the frequency band of detection width of photodetector (13) should be at least greater than 12GHz.
5. a kind of oil gas condition monitoring system according to claim 1 based on the distributing optical fiber sensing network; It is characterized in that; The centre frequency of the passband of optical filter (10) should be at the frequency place of the following 10GHz of high coherent length laser instrument centre frequency, and the passband width is at least greater than 5GHz.
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| CN2011101313828A CN102788648A (en) | 2011-05-20 | 2011-05-20 | Oil and gas condition monitoring system based on distributed optical fiber sensing network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764461A (en) * | 2017-11-28 | 2018-03-06 | 南方科技大学 | Distributed Hydraulic Sensor System Based on Brillouin Dynamic Grating |
| CN109000613A (en) * | 2018-08-22 | 2018-12-14 | 太原理工大学 | A three-dimensional rapid detection system for geological subsidence in goaf |
| CN110077247A (en) * | 2019-06-06 | 2019-08-02 | 北京有感科技有限责任公司 | Wireless charging foreign matter detection system and detection method based on optical fiber sensing network |
-
2011
- 2011-05-20 CN CN2011101313828A patent/CN102788648A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764461A (en) * | 2017-11-28 | 2018-03-06 | 南方科技大学 | Distributed Hydraulic Sensor System Based on Brillouin Dynamic Grating |
| CN107764461B (en) * | 2017-11-28 | 2023-10-20 | 南方科技大学 | Distributed hydraulic sensor system based on Brillouin dynamic grating |
| CN109000613A (en) * | 2018-08-22 | 2018-12-14 | 太原理工大学 | A three-dimensional rapid detection system for geological subsidence in goaf |
| CN110077247A (en) * | 2019-06-06 | 2019-08-02 | 北京有感科技有限责任公司 | Wireless charging foreign matter detection system and detection method based on optical fiber sensing network |
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Application publication date: 20121121 |