CN200943489Y - Optical fiber grating sensor for high temperature and high pressure fluid checking - Google Patents
Optical fiber grating sensor for high temperature and high pressure fluid checking Download PDFInfo
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- CN200943489Y CN200943489Y CNU2006200269396U CN200620026939U CN200943489Y CN 200943489 Y CN200943489 Y CN 200943489Y CN U2006200269396 U CNU2006200269396 U CN U2006200269396U CN 200620026939 U CN200620026939 U CN 200620026939U CN 200943489 Y CN200943489 Y CN 200943489Y
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Abstract
This utility model discloses a fiber-optic and grating temperature pressure sensor for detecting a high temperature and pressure liquid, which comprises a multiple-hole metal protecting case, a jacket in the protecting case, silicone oil fully filled in the jacket and a fiber-optic and grating sensor comprising a double-hole and single-mode photosensitive fiber in the jacket and a fiber-optic and grating sensor element comprising a single-mode transmission fiber-optic cable connected with two ends of a fiber-optic and grating sensor head; a stainless steel pipe encapsulating the fiber-optic and grating sensor element; a metal guard arranged on the bottom end of the stainless steel pipe and a locknut fixing the metal guard on the bottom end of the stainless steel pipe; an optical fiber cable connecting pipe arranged on the bottom end of the stainless steel pipe, an upper cap covering the fiber-optic cable connecting pipe and an out-line pipe of fiber-optic and grating sensor head with a convex formed on the top end of the upper end, wherein the fiber-optic and grating sensor element is connected to the upper cap by passing through the fiber-optic cable connecting pipe and the single-mode transmission fiber-optic cable at the end sticks out of the line-out pipe. This utility model is characterized in high precision of measurement, large pressure range, and unavailable space with large pressure difference, high reliability and a longer service life.
Description
Technical field
The utility model relates to a kind of sensor.The optical fiber optical grating temperature pressure sensing device that high-temperature, high pressure fluid detects that is used for 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 utility model 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 utility model.
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 in the utility model is that the optical fiber optical grating temperature pressure sensing device that high-temperature, high pressure fluid detects that is used for of a kind of high accuracy, big pressure limit is provided.
Another technical problem to be solved in the utility model is to provide a kind of encapsulation simple, long-life optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection of nothing machinery motion.
A technical problem more to be solved in the utility model is, what provide that a kind of temperature and pressure can independent measurement non-interferingly is used for the optical fiber optical grating temperature pressure sensing device that high-temperature, high pressure fluid detects.
The technical scheme that the utility model adopted is: a kind ofly be used for the optical fiber optical grating temperature pressure sensing device that high-temperature, high pressure fluid detects, include: 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 of this 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.
The optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection of the present utility model, 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 utility model 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 utility model;
Fig. 2 is the schematic diagram of optical fiber sensor head of the present utility model;
Fig. 3 is the structural representation of porous metals protective cover of the present utility model;
Fig. 4 is an optical fiber optical grating temperature pressure sensing actuator temperature change curve of the present utility model;
Fig. 5 is optical fiber optical grating temperature pressure sensing device pressure history figure of the present utility model.
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 the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection of the present utility model is made a detailed description.
As Fig. 1, Fig. 2, shown in Figure 3, of the present utility modelly be used for the optical fiber optical grating temperature pressure sensing device that high-temperature, high pressure fluid detects, 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, 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 the utility model preferred embodiment, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model is to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.
Claims (7)
1. one kind is used for the optical fiber optical grating temperature pressure sensing device that high-temperature, high pressure fluid detects, 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 of this end (2) is stretched out from going out spool (11).
2. the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection 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. the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection according to claim 1 is characterized in that the thickness of described stainless steel tube (6) is more than the 5mm.
4. the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection according to claim 1 is characterized in that described sheath (4) is an oil proof sheath.
5. the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection according to claim 1 is characterized in that described single-mode transmission optical fiber (2) is a utter misery optical fiber.
6. the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection 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. the optical fiber optical grating temperature pressure sensing device that is used for the high-temperature, high pressure fluid detection 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 |
|---|---|---|---|
| CNU2006200269396U CN200943489Y (en) | 2006-08-04 | 2006-08-04 | Optical fiber grating sensor for high temperature and high pressure fluid checking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200269396U CN200943489Y (en) | 2006-08-04 | 2006-08-04 | Optical fiber grating sensor for high temperature and high pressure fluid checking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200943489Y true CN200943489Y (en) | 2007-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200269396U Expired - Lifetime CN200943489Y (en) | 2006-08-04 | 2006-08-04 | Optical fiber grating sensor for high temperature and high pressure fluid checking |
Country Status (1)
| Country | Link |
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| CN (1) | CN200943489Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908370B (en) * | 2006-08-04 | 2011-11-16 | 天津爱天光电子科技有限公司 | Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing |
-
2006
- 2006-08-04 CN CNU2006200269396U patent/CN200943489Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908370B (en) * | 2006-08-04 | 2011-11-16 | 天津爱天光电子科技有限公司 | Optical fiber grating temperature-pressure sensor for high-pressure flow liquid testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20070905 Effective date of abandoning: 20060804 |