CN101865735B - Packaging structure and method of quasi-distributed fiber grating temperature sensor - Google Patents
Packaging structure and method of quasi-distributed fiber grating temperature sensor Download PDFInfo
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- CN101865735B CN101865735B CN2010101859847A CN201010185984A CN101865735B CN 101865735 B CN101865735 B CN 101865735B CN 2010101859847 A CN2010101859847 A CN 2010101859847A CN 201010185984 A CN201010185984 A CN 201010185984A CN 101865735 B CN101865735 B CN 101865735B
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- 239000000835 fiber Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 title abstract 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000010935 stainless steel Substances 0.000 claims abstract description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims description 23
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000012943 hotmelt Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 4
- 238000007499 fusion processing Methods 0.000 claims description 4
- 238000003475 lamination Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 239000003129 oil well Substances 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000005253 cladding Methods 0.000 abstract 5
- 229910000838 Al alloy Inorganic materials 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 239000010453 quartz Substances 0.000 description 22
- 238000005538 encapsulation Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
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- 238000007789 sealing Methods 0.000 description 3
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Abstract
The invention discloses a packaging structure and a packaging method of a quasi-distributed fiber grating temperature sensor. The packaging structure comprises a quartz glass capillary packaging structure for a single fiber grating temperature sensor and a packaging structure of the quasi-distributed fiber grating temperature sensor by adopting triple metal cladding technology. The quartz glass capillary packaging structure for the single fiber grating temperature sensor has the advantages of temperature sensitivity and measuring range meeting the requirements of measurement of high-temperature oil wells, high repeatability, high temperature resistance, small volume, high measuring accuracy and the like. The method for packaging the triple metal cladding packaging structure for the quasi-distributed fiber grating temperature sensor formed by serially connecting a plurality of fiber gratings comprises primary stainless steel tube cladding, secondary aluminum alloy pipe cladding and tripe thick wall stainless steel tube cladding. The packaging structure has the advantages of simpleness, insensitivity to stress and ambient pressure change, and capability of meeting special requirements on fiber grating temperature sensor packaging in a severe environment, particularly high temperature (300 DEG C), high pressure (100MPa), acid, alkali and the like under oil and gas wells.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of encapsulation technology of quasi-distributed fiber grating temperature sensor, relate in particular to the encapsulating structure and the method for the quasi-distributed fiber grating temperature sensor of a kind of suitable oil gas down-hole thermometric.
Background technology
In oil reservoir industry, to real-time, dynamic, online, the distributed monitoring of producing oil well temperature, understand the physical state of down-hole oil reservoir, be to optimize the oil recovery technique scheme, improve one of important measures of oil and gas production and recovery ratio.In the production run in some oil field, in order to improve oil production rate, need inject high-temperature steam or burn heating oil well, downhole temperature is up to more than 300 ℃.Since traditional electronic type thermometric instruments in high temperature and high pressure environment a little less than poor reliability, the antijamming capability and the life-span short, can not satisfy the needs of underground survey.
Fiber grating (FBG) sensing technology is in recent years at the novel sensing technology of the confirmed a kind of high precision of industry member, high reliability, anti-interference and suitable abominable working environment; Having based on the Fibre Optical Sensor of FBG can multiplexing on a large scale characteristic; Promptly can realize multisensor or measuring multiple parameters at many sensors of a signal transmission fiber cascaded.The cascade of many FBG temperature sensors is used for the multipoint temperature measuring of important section under the oil well, and electron temperature measurement method relatively has high temperature resistant (can reach 300 ℃), to measure temperature spot many, and can do permanent thermometric advantage; Relatively based on the optical fiber continuous temperature measurement method (DTS) of Raman scattering, have the measuring accuracy height, high temperature resistant, the characteristics that long-time stability are good are particularly suitable for being applied to the permanent monitoring of emphasis section under the hot hole targetedly.
But because fiber grating itself fragility fractures easily, in practical application, the fiber-optical grating temperature sensor of not doing any protection receives extruding and the shearing of external force easily and is destroyed; Also there is certain temperature-strain cross-sensitivity in fiber grating, when carrying out accurate temperature measurement, must mask the stretched variation of the grating bragg wavelength that causes of extraneous stress or optical fiber; In addition, in the Petroleum Production well, fiber-optical grating temperature sensor will be operated in the rugged surroundings such as high temperature, high pressure, acid, alkali, steam.Therefore, must seek a kind of effective packaged type and solve the problems referred to above.
Summary of the invention
To the problem that prior art exists, the object of the present invention is to provide a kind of simple in structure, good endurance, influence, the encapsulating structure that can adapt to the quasi-distributed fiber grating temperature sensor of thermometric needs in the rugged surroundings and method can eliminate stress.The encapsulating structure and the method that particularly adapt to the quasi-distributed fiber grating temperature sensor of rugged surroundings such as high temperature, high pressure, deep-etching in the Petroleum Production well.
For realizing above-mentioned purpose; The encapsulating structure of quasi-distributed fiber grating temperature sensor of the present invention is in series by a plurality of fiber-optical grating temperature sensors, and the fiber grating of each fiber-optical grating temperature sensor and the link of fiber-optical grating temperature sensor are placed in the quartz glass capillary and sealing and fixing.
Further, be welded to connect between the said fiber-optical grating temperature sensor.
Further, said encapsulating structure is provided with one or more quartz capillaries.
Further, said encapsulating structure is provided with a plurality of quartz capillaries, the link of the fiber grating of a ccontaining said fiber-optical grating temperature sensor and fiber-optical grating temperature sensor in each quartz capillary.
Further, the fiber grating that can ccontaining a plurality of fiber-optical grating temperature sensors in the said quartz capillary and the link of fiber-optical grating temperature sensor.
Further, the length of said quartz glass capillary is 50mm-100mm, internal diameter 130-170um, wall thickness 100-300um.
Further, the outside of said encapsulating structure coats a stainless-steel tube, and this stainless-steel tube outside coats aluminium lamination, and the aluminium lamination outside coats a stainless-steel tube again.
The method for packing of quasi-distributed fiber grating temperature sensor of the present invention is specially: it is subsequent use 1) to shear quartz glass capillary; 2) tail optical fiber of fiber grating grid region one side is cut short, gone to apply; The fine side of short-tail that quartz glass capillary is cut short by fiber grating is overlapped to the fine side of long-tail; 3) with the fine side of short-tail of grating and the fine side welding of long-tail of next fiber grating, the naked fine total length of distinguishing that guarantees grating grid region and both sides thereof in the fusion process is less than quartz capillary length; 4) the quartz capillary cover is back to the fine side of grating short-tail; 5) with the two ends and the optical fiber fixing seal of quartz capillary.
Further, the length of said quartz glass capillary is 50mm-100mm, internal diameter 130-170um, wall thickness 100-300um.
Further, the step 3) fusion process adopts the optical fiber splicer welding.
Further, step 5) adopts CO2 laser beam hot melt perhaps with two ends and the optical fiber fixing seal of high temperature resistance and high strength glue with quartz capillary.
Further, the quasi-distributed thermometric structure that packaged a plurality of fiber gratings are in series further encapsulates, and adopts the stainless-steel tube of wall thickness 0.2-0.3mm once to coat; Then, carry out and once coat the aluminium lamination coating that stainless-steel tube is combined closely; Adopt again and wear method, will wear through the sensor of twice coating in the withstand voltage stainless-steel tube of heavy wall.
Effect of the present invention and benefit be, the single fiber-optical grating temperature sensor of adopting quartz glass kapillary encapsulation, have good reproducibility, high temperature resistant, volume is little, sensitivity and range ability are fit to high temperature logging requirements, the advantage that measuring accuracy is high; The three minor metal encapsulating sealing structures that the quasi-distributed thermometric structure that is in series by many fiber gratings is adopted; Overcome optical fiber, grating is easily broken, is subject to shortcomings such as extraneous strain influence, has simple in structure; Cheap; Can prevent effectively that water logging, hydrogen from soaking the characteristics such as change to optical properties, can adapt to rugged surroundings, especially in the rugged surroundings such as oil gas down-hole high temperature (300 ℃), high pressure (100MPa), acid, alkali during thermometric to the specific (special) requirements of fiber-optical grating temperature sensor encapsulation.
Description of drawings
Fig. 1 is a quartz glass capillary encapsulating structure synoptic diagram;
Among the figure: the 1st, the fine side of fiber grating long-tail (band applies); The 2nd, quartz glass capillary; The 3rd, fiber grating; The 4th, the fine side of fiber grating short-tail (having gone to apply); The 5th, the optical fiber connection welding; The 6th, the fine side of the long-tail of another fiber grating; The 7th, high-temperature plastic or the fixing seal point that forms with CO2 laser beam hot melt.
Fig. 2 carries out quartz capillary and optical fiber hot melt stationary installation synoptic diagram with the CO2 laser beam;
Among the figure: the 8th, be used to control the microcomputer of CO2 laser instrument; The 9th, high-frequency impulse CO2 laser instrument; 10 is the adjustable quartz capillary clampers of five dimensions; The 11st, encapsulating the quartz capillary of fiber grating; The 12nd, the beam splitting of CO2 laser beam, reflecting system; The 13rd, optical fiber; The 14th, the CO2 laser beam.
Fig. 3 aims at the three minor metal encapsulating sealing structure synoptic diagram that the distributed temperature measuring structure adopts.
Among the figure: the 15th, the quasi-distributed fiber grating temperature sensor system that the grating of quartz capillary encapsulation is in series; The 16th, stainless-steel tube; The 17th, aluminum pipe; The 18th, the heavy wall stainless-steel tube.
Embodiment
Specify most preferred embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
The specific practice of single fiber-optical grating temperature sensor encapsulation (see figure 1) is: (1) cutting one segment length is 50-100mm, internal diameter 130-150um, the quartz glass capillary 2 of wall thickness 100-300um; (2) with fiber grating 3 one side tail optical fibers from cutting off greater than 15mm apart from the grid region, form the fine side 4 of short-tail; (3) remove the fine section of short-tail coat, clean with pure water/alcohol wipe; (5) quartz capillary 2 is worn to the fine side 1 band coating interval of grating long-tail; (6) with the optical fiber cutting knife at fine side 4 cutting optical fibres of short-tail, put it on the optical fiber splicer afterwards; (7) the fine side 6 of the long-tail of next grating is gone to apply, cut flat end face, weld with optical fiber splicer, form solder joint 5 with the end face of handling well in (6); (8) quartz capillary 2 covers are back to the fine side 4 of grating short-tail, guarantee that quartz capillary 2 covers grating 3 and solder joint 5; (9) adopt high temperature resistance and high strength glue 7 perhaps with two ends and the optical fiber fixing seal of CO2 laser beam hot-melt technology with quartz capillary.Wherein adopt the specific practice of CO2 laser beam hot melt technique for fixing (see figure 2) to be: at first; Adopt the method for dividing amplitude that a branch of high frequency (20k-24kHz) CO2 pulse laser beam 14 usefulness partially reflecting mirrors are divided into three impartial bundle of pulsed laser of three beam intensities, and reflect to form three beams high frequency CO 2 pulse lasers that intersect at a point and in same plane, be mutually 120 degree angles through reflector group 12; Then quartz capillary 11 and optical fiber 13 are clamped on the adjustable quartz capillary clamper 10 of five dimensions, regulate quartz capillary clamper 10, quartz capillary 11 1 ends are on the intersection point of three beams high frequency CO 2 pulse lasers; Running parameter through microcomputer 8 setting CO2 laser instruments 9 such as frequency of operation, dutycycle and laser pulse etc., carries out the heat fixation that adds between quartz capillary and optical fiber; Through same operation the other end of quartz capillary and optical fiber being carried out hot melt at last fixes.
When encapsulating according to above-mentioned method to the encapsulation of single fiber grating, a plurality of fiber gratings quasi-distributed temperature survey structure that has been in series.To the quasi-distributed thermometric structure that forms therefrom; Adopt three minor metal clad structures to encapsulate (see figure 3), its specific practice is: at first adopt 16 pairs of quasi-distributed fiber grating temperature sensor systems 15 of stainless-steel tube of wall thickness 0.2-0.3mm once to coat; Adopt aluminum pipe 17 to carry out the coating of combining closely then with stainless-steel tube 16 external diameter; Twice coating all is to adopt ripe optical cable processing technology to accomplish.Adopt at last and wear method, will wear through the sensor of twice coating in the withstand voltage stainless-steel tube 18 of heavy wall.
The quartz glass capillary that adopts in the present embodiment can be placed in a plurality of fiber gratings in one capillary for a very long kapillary; Also can one capillary be set corresponding each section fiber grating, in any case distortion does not all break away from the protection domain of claim of the present invention.
It is to be noted and any distortion of making according to embodiment of the present invention all do not break away from the scope that spirit of the present invention and claim are put down in writing.
Claims (4)
1. the method for packing of the encapsulating structure of a quasi-distributed fiber grating temperature sensor is specially:
1) the shearing quartz glass capillary is subsequent use; 2) tail optical fiber of fiber grating grid region one side is cut short, gone to apply; The fine side of short-tail that quartz glass capillary is cut short by fiber grating is overlapped to the fine side of long-tail; 3) with the fine side of short-tail of fiber grating and the fine side welding of long-tail of next fiber grating, the naked fine total length of distinguishing that guarantees fiber grating grid region and both sides thereof in the fusion process is less than quartz glass capillary length; 4) the quartz glass capillary cover is back to the fine side of fiber grating short-tail; 5) with the two ends and the optical fiber fixing seal of quartz glass capillary; 6) the quasi-distributed thermometric structure that packaged a plurality of fiber gratings is in series further encapsulates, and adopts the stainless-steel tube of wall thickness 0.2-0.3m m once to coat; Then, carry out and once coat the aluminium lamination coating that stainless-steel tube is combined closely; Adopt again and wear method, will wear through the sensor of twice coating in the withstand voltage stainless-steel tube of heavy wall.
2. the method for packing of quasi-distributed fiber grating temperature sensor according to claim 1 is characterized in that the length of said quartz glass capillary is 50mm-100mm, internal diameter 130-170um, wall thickness 100-300um.
3. the method for packing of quasi-distributed fiber grating temperature sensor according to claim 1 is characterized in that, the step 3) fusion process adopts the optical fiber splicer welding.
4. the method for packing of quasi-distributed fiber grating temperature sensor according to claim 1 is characterized in that, step 5) adopts CO2 laser beam hot melt or with two ends and the optical fiber fixing seal of high temperature resistance and high strength glue with quartz glass capillary.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101859847A CN101865735B (en) | 2010-05-28 | 2010-05-28 | Packaging structure and method of quasi-distributed fiber grating temperature sensor |
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| CN2010101859847A CN101865735B (en) | 2010-05-28 | 2010-05-28 | Packaging structure and method of quasi-distributed fiber grating temperature sensor |
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| CN101865735A CN101865735A (en) | 2010-10-20 |
| CN101865735B true CN101865735B (en) | 2012-07-04 |
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| CN2549430Y (en) * | 2002-05-30 | 2003-05-07 | 欧进萍 | Optical fiber raster capillary packed strain gauge |
| JP4331978B2 (en) * | 2003-05-26 | 2009-09-16 | 京セラ株式会社 | FBG sensing system |
| GB2407377B (en) * | 2003-10-16 | 2006-04-19 | Kidde Ip Holdings Ltd | Fibre bragg grating sensors |
| CN1928599A (en) * | 2006-09-29 | 2007-03-14 | 天津爱天光电子科技有限公司 | Optical fiber grating sensor and portable electric devices temperature detection system therewith |
| CN101324189B (en) * | 2008-07-28 | 2011-12-21 | 西安石油大学 | External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor |
| CN101413831A (en) * | 2008-11-29 | 2009-04-22 | 大连理工大学 | Method for packaging sensitized optical fiber grating temperature sensor |
| CN201794579U (en) * | 2010-05-28 | 2011-04-13 | 北京康华盛鸿能源科技发展有限公司 | Packaging structure of quasi-distributed fiber grating temperature sensor |
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Granted publication date: 20120704 |