CN1908370B - Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing - Google Patents
Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing Download PDFInfo
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- CN1908370B CN1908370B CN2006100151971A CN200610015197A CN1908370B CN 1908370 B CN1908370 B CN 1908370B CN 2006100151971 A CN2006100151971 A CN 2006100151971A CN 200610015197 A CN200610015197 A CN 200610015197A CN 1908370 B CN1908370 B CN 1908370B
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- 230000003287 optical effect Effects 0.000 claims description 13
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- 239000003921 oil Substances 0.000 abstract description 13
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Abstract
The present invention relates to a fiber grating sensor for detecting temperature or pressure of high-pressure fluid, wherein it comprises; a porous metal protective frame, a sleeve inside the protective frame, the silicon oil filled into the sleeve, the fiber grating sensor inside the sleeve formed by dual-hole single-mode light-sensing fiber, and the fiber grating sensor connected to two ends of fiber grating sensor and formed by single-mode transmission fiber, the stainless steel tube packing the fiber grating sensor, the metal frame at the bottom of stainless steel tube, the locking nut for fixing the metal frame on the bottom of stainless steel tube, the cable joint tube at the top of stainless steel tube, the upper cap covering the cable jointing tube, and the wire tube of fiber grating sensor at the top of upper cap. The fiber grating sensor is through the cable jointing tube into the upper cap; at said end, the single-mode transmission fiber is extended outside the wire tube. The invention has high accuracy, large pressure range, and long service life.
Description
Technical field
The present invention relates to a kind of sensor.A kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure that particularly relates to a kind of high accuracy, big pressure limit.
Background technology
Fiber-optic grating sensor is the novel sensor of researching and developing in recent years, the sensing that fiber-optic grating sensor can collect information be transmitted in one, compare it with traditional sensor and have a lot of advantages: as explosion-proof, anti-electromagnetic interference, anticorrosive, anti-vibration, high temperature resistant, volume is little, in light weight, flexible.Particularly can under adverse circumstances, use, in Oilfield developing with in producing, people need know in relevant stratum, the distribution and the flow parameter (temperature, pressure, flow etc.) of fluid (oil, G﹠W), thus obtain best running status so that control.For obtaining these parameters, corresponding sensor need be set in a plurality of oil-producing wells, water injection well and measuring well, the mobile parameter of oil, gas, water that (often relates to a plurality of stratum) in the stratum is carried out continuous monitoring.Accuracy and the reliability measured are very important.
Because measuring condition is abominable in the oil well: temperature height, pressure are greatly, material and electromagnetic interference etc. are corrosive.Here, because the intrinsic weakness of electrical type sensor (volume weight is big, be subject to electromagnetic interference, reliability safety hidden danger is many, operation and maintenance cost is high, life-span short), thereby this class sensor is difficult to use.On the contrary, fiber-optic grating sensor is owing to little, in light weight, anticorrosive, the anti-electromagnetic interference of its volume, high temperature resistant and high pressure, can ignition and blasting in oil and gas environments, it is the sensor of a kind of " essential safety ", thereby, it is a kind of to oil well, the ideal transducer that the temperature in the geothermal well, pressure are measured.
To the oil reservoirs on stratum and dynamically estimating of reservoir exploitation, determine the oil field development deployment for better, dynamically provide scientific basis for the fine description oil reservoir for the engineering geology scientific and technical personnel, the real time on-line monitoring of oil reservoir seems and is even more important.
Because the restriction of technical condition, long-term in the past detection method is to carry out oil pumper to play the pump pressure measurement, has both influenced production, increases cost again.Annulus logging is because the factor of ectocine is too many, success rate is very low, and to horizontal well, the method for testing of heavy oil wells is not overripened, the zonal pressure of oil well and well dynamically can't long-term online detection, and the accurate acquisition of the data of oil-well strata becomes a great problem of oilfield monitoring work.
Chinese patent 02156479.5 discloses and a kind of a fiber grating has been divided into two sections, respectively fiber grating is encapsulated with two kinds of different chemical polymerization things, the reflection peak of two different wave lengths will appear in the fiber grating under this encapsulation, and it can measure temperature and pressure simultaneously.Because this encapsulation is the chemical polymerization thing, can't bear hundreds of atmospheric pressure; Though it has two reflection peaks, each reflection peak all is the function of temperature and pressure, and precision, reliability and life-span all can not get guaranteeing.
Chinese patent 02148911.4 usefulness is protected the quick optical fiber fabrication birefringence fiber of polarisation grating, and its performance and the present invention have points of resemblance, but it is not to be used for making temperature and pressure transmitter, but is used for the dispersion compensation of communication.And with the sensitivity of the pressure to external world of protecting the quick optical fiber fabrication birefringent light of polarisation fiber grating sensor less than lateral opening light-sensitive optical fibre of the present invention.
Chinese patent 02121327.5 discloses a kind of optical fiber grating temperature-pressure sensor that can measure temperature, pressure simultaneously, and its basic principle is based on the semi girder technology; Fiber grating is bonded on the semi girder, semi girder is subjected to external force effect elongation or compression, drive the variation of fiber grating reflection wavelength, because long-term mechanical movement, bearing large-scale pressure again changes, at present packaging technology can't guarantee Wavelength stabilizedly not drift about, and working life is also limited in low pressure range, and this mechanism can not be applied to big pressure range.
Existing as from the foregoing technology has following problem: the one, and ordinary optic fibre grating sensor temperature and pressure can't separate, and the variations in temperature of fiber grating greatly influences tonometric precision: two are to use the method for packing of ordinary optic fibre grating temperature pressure sensor can't guarantee measuring reliability and life-span.The 3rd, utilize other methods of semi girder can not bear big pressure for a long time and change with mechanical movement.
Summary of the invention
Technical problem to be solved by this invention is that a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure of a kind of high accuracy, big pressure limit is provided.
Another technical problem to be solved by this invention is to provide a kind of encapsulation simple, long-life a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure of nothing machinery motion.
A technical problem more to be solved by this invention is, non-interfering a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure that a kind of temperature and pressure can independent measurement is provided.
The technical solution adopted in the present invention is: a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure includes: by the porous metals protective cover, be positioned at protective cover sheath, be full of the silicone oil of sheath and optical fiber grating sensing unit that the single-mode transmission optical fiber that is arranged on the optical fiber grating sensing head that is made of diplopore single mode light-sensitive optical fibre of sheath and is connected the optical fiber grating sensing head two ends is formed; The stainless steel tube of packaged fiber grating sensing unit; Be arranged on the metal guard and the locking nut that is used for the metal guard is fixed on the stainless steel tube bottom of stainless steel tube bottom; Be arranged on the optical cable connection tube on stainless steel tube top, with cover cap on the optical cable connection tube, be formed with on the top of last cap protrusion optical fiber grating sensing head go out spool, wherein, optical fiber grating sensing unit runs through in the supreme cap of optical cable connection tube, and the single-mode transmission optical fiber that is positioned at the cap end is stretched out from going out spool.
The diplopore single mode light-sensitive optical fibre of described formation optical fiber grating sensing head, its structure are to be formed with the axial pass-through holes parallel and symmetrical with fibre core in the fibre core both sides of single mode light-sensitive optical fibre, this through hole make optical fiber grating sensing head to external world pressure birefringence effect is arranged.
The thickness of described stainless steel tube is more than the 5mm.
Described sheath is an oil proof sheath.
Described single-mode transmission optical fiber is a utter misery optical fiber.
The two ends of described optical fiber grating sensing head are to be connected by welding with single-mode transmission optical fiber.
Described sheath is divided into up and down two parts in the junction of last cap and stainless steel tube, identical with pressure in stainless steel tube in order to guarantee the pressure of sheath in last cap, also has a plurality of apertures on the top of stainless steel tube.
A kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure of the present invention, except two through holes of the fibre core both sides of the diplopore single mode light-sensitive optical fibre that constitutes optical fiber grating sensing head, its each parts all are in the same pressure environment, do not need the tight chamber that seals, do not have the space of very big pressure reduction.This tolerance that makes each parts of sensing head make is relaxed greatly, and the life-span prolongs.In the sensing head that the present invention relates to, do not have other stress on the fiber grating except isotropic tested static pressure is arranged, in fact it be in free state.Make fiber-optic grating sensor have very long application life like this.And sensing head do not contain the complicated mechanical transmission mechanism, and its inside need not to have the strictly cabin of sealing yet, thereby the reliability height, and the life-span is long.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 is the schematic diagram of optical fiber sensor head of the present invention;
Fig. 3 is the structural representation of porous metals protective cover of the present invention;
Fig. 4 is an optical fiber optical grating temperature pressure sensing actuator temperature change curve of the present invention;
Fig. 5 is optical fiber optical grating temperature pressure sensing device pressure history figure of the present invention.
Wherein:
1: optical fiber grating sensing head 2: single-mode transmission optical fiber
3: silicone oil 4: sheath
5: porous metals protective cover 6: stainless steel tube
7: metal guard 8: sealing ring
9: locking nut 10: go up cap
11: go out spool 12: the optical cable connection tube
15: optical fiber grating sensing unit
The specific embodiment
Below in conjunction with embodiment and accompanying drawing a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure of the present invention is made a detailed description.
As Fig. 1, Fig. 2, shown in Figure 3, a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure of the present invention includes: by porous metals protective cover 5, be positioned at protective cover 5 sheath 4, be full of the silicone oil 3 of sheath 4 and optical fiber grating sensing unit 15 that the single-mode transmission optical fiber 2 that is arranged on the optical fiber grating sensing head 1 that is made of diplopore single mode light-sensitive optical fibre of sheath 4 and is connected optical fiber grating sensing head 1 two ends is formed; The stainless steel tube 6 of packaged fiber grating sensing unit 15, the thickness of stainless steel tube 6 are more than the 5mm, and be indeformable so that can bear high pressure. The foreign matters such as prevented sandstone that are arranged on stainless steel tube 6 bottoms enter the metal guard 7 in the stainless steel tube 6 and are used for metal guard 7 is fixed on the locking nut 9 and the sealing ring 8 of stainless steel tube 6 bottoms; Be arranged on the optical cable connection tube 12 on stainless steel tube 6 tops, with cover cap 10 on the optical cable connection tube 12, be formed with on the top of last cap 10 protrusion optical fiber grating sensing head go out spool 11, wherein, optical fiber grating sensing unit 15 runs through in the optical cable connection tube 12 supreme caps 10, and the single-mode transmission optical fiber 2 of this end is stretched out from going out spool 11.
The diplopore single mode light-sensitive optical fibre of above-mentioned formation optical fiber grating sensing head 1, its structure is to be formed with the axial pass-through holes parallel and symmetrical with fibre core in the fibre core both sides of single mode light-sensitive optical fibre, this through hole make optical fiber grating sensing head 1 to external world pressure birefringence effect is arranged, under external force, the bragg wavelength that reflects by fiber grating has two different wavelength peaks.
As shown in Figure 5, two reflection wavelengths of optical fiber grating sensing unit have identical temperature performance, and under the situation of no external force effect, two reflection wavelengths are not separated, annex.Therefore the distance between two reflection wavelength peak values is only relevant with ambient pressure, temperature independent, has guaranteed the accuracy of pressure detecting like this.
As shown in Figure 4, one of them reflection wavelength and the ambient pressure of optical fiber grating sensing unit are insensitive, and its reflection wavelength change value is the function of temperature, can obtain the temperature of test environment thus.
In the single-mode transmission optical fiber 2 that optical fiber grating sensing head 1 two ends connect, the single-mode transmission optical fiber 2 of one end has only 3 millimeter long, its function is the through hole of two symmetries of the fibre core both sides of hermetic fiber grating sensing head 1, to guarantee that outside liquid does not enter in the through hole, and the single-mode transmission optical fiber 2 of the other end not only has the through hole of two symmetries of the fibre core both sides of hermetic fiber grating sensing head 1, also has the effect of transmission sensing signal to main frame simultaneously.The two ends of optical fiber grating sensing head 1 are to be connected by welding with single-mode transmission optical fiber 2.
Form optical fiber grating sensing unit 15 by optical fiber grating sensing head 1, single-mode transmission optical fiber 2, silicone oil 3, oil resistant flexible rubber sheath 4 and porous metals protective cover 5; guaranteed the reliability of optical fiber optical grating temperature pressure sensing unit; make it both have the function that obtains transducing signal, can prevent again simultaneously extraneous may be to the damage of optical fiber grating temperature, pressure sensing unit.
Described single-mode transmission optical fiber 2 is a utter misery optical fiber, and it can prevent that under high pressure hydrogen atom infiltrates in the transmission cable 2.
The above only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention is to any simple modification that above embodiment did, and equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (7)
1. fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure, it is characterized in that, include: by porous metals protective cover (5), be positioned at protective cover (5) sheath (4), be full of the silicone oil (3) of sheath (4) and optical fiber grating sensing unit (15) that the single-mode transmission optical fiber (2) that is arranged on the optical fiber grating sensing head (1) that is made of diplopore single mode light-sensitive optical fibre of sheath (4) and is connected optical fiber grating sensing head (1) two ends is formed; The stainless steel tube (6) of packaged fiber grating sensing unit (15); Be arranged on the metal guard (7) of stainless steel tube (6) bottom and be used for metal guard (7) is fixed on the locking nut (9) of stainless steel tube (6) bottom; Be arranged on the optical cable connection tube (12) on stainless steel tube (6) top, with the last cap (10) that covers on optical cable connection tube (12), be formed with on the top of last cap (10) protrusion optical fiber grating sensing head go out spool (11), wherein, optical fiber grating sensing unit (15) runs through in the supreme cap of optical cable connection tube (12) (10), and the single-mode transmission optical fiber (2) that is positioned at cap (10) end is stretched out from going out spool (11).
2. a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure according to claim 1, it is characterized in that, the diplopore single mode light-sensitive optical fibre of described formation optical fiber grating sensing head (1), its structure is to be formed with the axial pass-through holes parallel and symmetrical with fibre core in the fibre core both sides of single mode light-sensitive optical fibre, this through hole make optical fiber grating sensing head (1) to external world pressure birefringence effect is arranged.
3. a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure according to claim 1 is characterized in that the thickness of described stainless steel tube (6) is more than the 5mm.
4. a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure according to claim 1 is characterized in that described sheath (4) is an oil proof sheath.
5. a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure according to claim 1 is characterized in that described single-mode transmission optical fiber (2) is a utter misery optical fiber.
6. a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure according to claim 1 is characterized in that, the two ends of described optical fiber grating sensing head (1) are to be connected by welding with single-mode transmission optical fiber (2).
7. a kind of fiber-optic grating sensor that is used to detect high-pressure fluid temperature or pressure according to claim 1, it is characterized in that, described sheath (4) is divided into two parts up and down in the junction of last cap (10) and stainless steel tube (6), in order to guarantee that the pressure of sheath (4) in last cap (10) is identical with the environment stress of optical fiber grating sensing head (1) with pressure in stainless steel tube (6), also has a plurality of apertures on the top of stainless steel tube (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100151971A CN1908370B (en) | 2006-08-04 | 2006-08-04 | Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100151971A CN1908370B (en) | 2006-08-04 | 2006-08-04 | Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing |
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| Publication Number | Publication Date |
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| CN1908370A CN1908370A (en) | 2007-02-07 |
| CN1908370B true CN1908370B (en) | 2011-11-16 |
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| CN2006100151971A Expired - Fee Related CN1908370B (en) | 2006-08-04 | 2006-08-04 | Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2542855B (en) * | 2015-10-02 | 2017-10-11 | Smart Fibres Ltd | Monitoring probe |
| CN110823760A (en) * | 2019-12-13 | 2020-02-21 | 无锡必创传感科技有限公司 | Fiber Optic Multifunctional Density Sensor |
| CN112882166B (en) * | 2021-01-14 | 2023-05-16 | 国网浙江省电力有限公司电力科学研究院 | Temperature measuring optical fiber packaging structure suitable for embedded transformer and use method thereof |
| CN116446850A (en) * | 2022-01-07 | 2023-07-18 | 中国石油化工股份有限公司 | A wellbore integrity test and evaluation device and method based on grating testing technology |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6144026A (en) * | 1997-10-17 | 2000-11-07 | Blue Road Research | Fiber optic grating corrosion and chemical sensor |
| CN1384341A (en) * | 2002-06-14 | 2002-12-11 | 清华大学 | Optical-fiber grating sensor detecting pressure temperature simultaneously |
| CN1482474A (en) * | 2003-07-14 | 2004-03-17 | 徐志宏 | Packaging structure of fibre-optical grating |
| CN200943489Y (en) * | 2006-08-04 | 2007-09-05 | 天津爱天光电子科技有限公司 | Optical fiber grating sensor for high temperature and high pressure fluid checking |
-
2006
- 2006-08-04 CN CN2006100151971A patent/CN1908370B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6144026A (en) * | 1997-10-17 | 2000-11-07 | Blue Road Research | Fiber optic grating corrosion and chemical sensor |
| CN1384341A (en) * | 2002-06-14 | 2002-12-11 | 清华大学 | Optical-fiber grating sensor detecting pressure temperature simultaneously |
| CN1482474A (en) * | 2003-07-14 | 2004-03-17 | 徐志宏 | Packaging structure of fibre-optical grating |
| CN200943489Y (en) * | 2006-08-04 | 2007-09-05 | 天津爱天光电子科技有限公司 | Optical fiber grating sensor for high temperature and high pressure fluid checking |
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