CN101922289B - Temperature compensation structure of optical fiber detector for high-temperature oil well - Google Patents
Temperature compensation structure of optical fiber detector for high-temperature oil well Download PDFInfo
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- CN101922289B CN101922289B CN 201010231235 CN201010231235A CN101922289B CN 101922289 B CN101922289 B CN 101922289B CN 201010231235 CN201010231235 CN 201010231235 CN 201010231235 A CN201010231235 A CN 201010231235A CN 101922289 B CN101922289 B CN 101922289B
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Abstract
The invention discloses a temperature compensation structure of an optical fiber detector for a high-temperature oil well, comprising a supporting barrel (10), two end covers (20) with holes, a first membrane (31), a second membrane (32) and springs (30), wherein the supporting barrel (10) is used for protecting the inner structure of the optical fiber detector; the two end covers (20) with holes are installed at both ends of the supporting barrel and used for connecting an optical cable; the first membrane (31) is installed between one side of the supporting barrel (10) and one end cover (20) and used for connecting and fixing an optical fiber; the second membrane (32) is installed between the other side of the supporting barrel (10) and the other end cover (20) and used for connecting and fixing the optical fiber; and the springs (30) are installed in the supporting barrel (10) and at the inner side of the second membrane (32) and used for supporting the second membrane (32) and controlling the stress in the optical fiber. By adopting the structures of the springs and the membranes, the temperature compensation structure realizes temperature compensation and solves the problem of temperature compensation of an underground optical fiber detector.
Description
Technical field
The present invention relates to the fiber optic sensor technology field for the downhole petroleum exploration, relate in particular to a kind of novel temperature compensation structure of optical fiber detector that is used for high-temperature oil well.
Background technology
Fibre Optical Sensor is compared with corresponding conventional sensors, has obvious advantage at aspects such as sensitivity, dynamic range, reliabilities, has brought into play increasing effect in civilian and national defence field, is classified as the sensor technology of giving priority to by many countries.
Optical fiber detector is to utilize optical fiber for extraneous sensitive, and its output light parameter changes with the seismic wave signal, thus the instrument of the variation exploration seismic ripple signal by surveying optical parameter.It is compared with traditional piezoelectric type sensor, and following main advantage is arranged: bandwidth, sound pressure sensitivity be high, be not subjected to electromagnetic interference, lightweight, can be designed to arbitrary shape, and have information sensing concurrently and optical transmission of information waits advantage.In view of the as above technical advantage of optical fiber detector, can satisfy various countries in the requirement of petroleum exploration field, at present a lot of research units and oil company have actively launched research in this regard.
Optical fiber detector be the output wavelength of utilizing optical fiber laser signal is responsive to external world, detect the sensor of seismic signal by the variation of surveying the Output of laser wavelength.The inventor of present patent application discloses a kind of for land and optical fiber detector under water in patent application 200910087349.2, this wave detector adopts diaphragm structure, by glue optical fiber laser and flexible member are bonded together, be applicable to the seismic exploration under the normal temperature.Yet when carrying out the downhole petroleum exploration, the thousands of rice of well depth, temperature can reach more than 150 degrees centigrade.If optical fiber detector does not carry out temperature-compensating under the environment of high temperature, high pressure since the deformation that causes of fuel factor to tend to be that wave detector can't work.Particularly can not be realized by the operation of shaft bottom to well head.Under high temperature and high pressure environment, aging and creep can occur with glue in encapsulation unavoidably, thereby affect the performance of wave detector.Therefore, the present invention is the further improvement to above-mentioned patent application, focuses on the problem that downhole petroleum is explored the high-temperature temperature compensation that faces that solves.There is not yet in this respect the similar techniques report.
In addition, traditional detector is carried out the change of frequency response, often needs structural parameters are carried out larger adjustment, even changes design scheme.Therefore, how adjusting easily the Frequency Response of wave detector, also is institute's problem needing to overcome during engineering is used.
Therefore, we propose a kind of temperature compensation structure of optical fiber detector for high-temperature oil well, are used for the problem of downhole optic fiber wave detector temperature-compensating, have proposed simultaneously to change the method for Frequency Response.This is that optical fiber sensing technology is used for the key technical problem that downhole petroleum exploration, oil well logging institute must solutions.
Summary of the invention
The technical problem that (one) will solve
In view of this, main purpose of the present invention is to provide a kind of temperature compensation structure of optical fiber detector for high-temperature oil well, to solve the problem of downhole optic fiber wave detector temperature-compensating.
(2) technical scheme
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of temperature compensation structure of optical fiber detector for high-temperature oil well, this structure comprises:
Be installed on two end caps 20 with holes at support tube two ends, be used for the connection of optical cable;
Be installed on a side of support tube 10 and the primary diaphragm 31 between the end cap 20, be used for connecting and fixed fiber;
Be installed on the opposite side of support tube 10 and the secondary diaphragm 32 between the end cap 20, be used for connecting and fixed fiber;
Be installed on the spring 30 of support tube 10 inside, secondary diaphragm 32 inboards, be used for supporting secondary diaphragm 32, and the stress in the control optical fiber.
In the such scheme, the central authorities of described support tube 10 have vertically and are no less than one and the uniform pectination hole 12 of hoop, are used for making the inside and outside UNICOM of optical fiber detector, thereby make things convenient for the coupling of seismic signal.
In the such scheme, described end cap 20 is used for drawing the optical fiber except have the first hole 22 at the end axial direction, has at least one second hole 21 in its side, is used for static balance.
In the such scheme, the frequency response characteristic of this structure is regulated by the diameter that changes the first hole 22.
In the such scheme, the inside, two ends of described carrying cylinder 10 further includes boss 11, is respectively applied to install primary diaphragm 31 and spring 30.
In the such scheme, the mounting method of described primary diaphragm 31 is to adopt end cap 20 to be pressed on the boss 11.
In the such scheme, the mounting method of described secondary diaphragm 32 is, spring 30 is installed on the boss 11, after optical fiber and secondary diaphragm 32 are fixed, secondary diaphragm 32 is pressed on the spring 30.
In the such scheme, a space 50 is arranged between described secondary diaphragm 32 and the mounted end cap 20.
In the such scheme, the position of end cap 20 is installed in the both sides of described support tube 10, further has the 3rd hole 14 in its side, is used for mounting screw or fills glue so that fixing end cap 20.
In the such scheme, the rigidity of described spring 30 is much smaller than the rigidity of the used optical fiber of this optical fiber detector.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect:
1, this temperature compensation structure of optical fiber detector for high-temperature oil well provided by the invention, the structure by spring and diaphragm has realized temperature-compensating, has solved the problem of downhole optic fiber wave detector temperature-compensating.
2, this temperature compensation structure of optical fiber detector for high-temperature oil well provided by the invention adopts the method that changes the end cap aperture to adjust the Frequency Response of wave detector, and is convenient and practical.
3, this temperature compensation structure of optical fiber detector for high-temperature oil well provided by the invention all adopts mechanical connecting structure, does not make to stick with glue the method that connects, thereby has avoided the aging and creep problem of under HTHP glue.
Description of drawings
Fig. 1 is the schematic diagram of the temperature compensation structure of optical fiber detector for high-temperature oil well provided by the invention;
Fig. 2 is schematic diagram and the sectional drawing of the support tube 10 of the temperature compensation structure of optical fiber detector for high-temperature oil well provided by the invention;
Fig. 3 is the schematic diagram of the temperature compensation structure of optical fiber detector end cap 20 for high-temperature oil well provided by the invention.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Such as Fig. 1～shown in Figure 3, the temperature compensation structure of optical fiber detector that should be used for high-temperature oil well comprises: support tube 10, for the protection of the optical fiber detector internal construction; Be installed on two end caps 20 with holes at support tube two ends, be used for the connection of optical cable; Be installed on a side of support tube 10 and the primary diaphragm 31 between the end cap 20, be used for connecting and fixed fiber; Be installed on the opposite side of support tube 10 and the secondary diaphragm 32 between the end cap 20, be used for connecting and fixed fiber; Be installed on the spring 30 of support tube 10 inside, secondary diaphragm 32 inboards, be used for supporting secondary diaphragm 32, and the stress in the control optical fiber.
Wherein, the central authorities of described support tube 10 have vertically and are no less than one and the uniform pectination hole 12 of hoop, are used for making the inside and outside UNICOM of optical fiber detector, thereby make things convenient for the coupling of seismic signal.Described end cap 20 is used for drawing the optical fiber except have the first hole 22 at the end axial direction, has at least one second hole 21 in its side, is used for static balance.The frequency response characteristic of this structure is regulated by the diameter that changes the first hole 22.The inside, two ends of described carrying cylinder 10 further includes boss 11, is respectively applied to install primary diaphragm 31 and spring 30.The mounting method of described primary diaphragm 31 is to adopt end cap 20 to be pressed on the boss 11.The mounting method of described secondary diaphragm 32 is, spring 30 is installed on the boss 11, after optical fiber and secondary diaphragm 32 are fixed, secondary diaphragm 32 is pressed on the spring 30.One space 50 is arranged between described secondary diaphragm 32 and the mounted end cap 20.The position of end cap 20 is installed in the both sides of described support tube 10, further has the 3rd hole 14 in its side, is used for mounting screw or fills glue so that fixing end cap 20.The rigidity of described spring 30 is much smaller than the rigidity of the used optical fiber of this optical fiber detector.
The operating principle of the temperature compensation structure of optical fiber detector for high-temperature oil well provided by the invention is: the medium of oil well to be measured is generally water or mud, when using the temperature compensation structure of optical fiber detector for high-temperature oil well of the present invention, it is transferred to suitable well depth, behind the earthquake-wave-exciting signal, seismic wave propagates on the temperature compensation structure of optical fiber detector by the medium in the well, in liquid environment, sound wave can be coupled to the inside of optical fiber detector by the first hole 22, and acts on the optical fiber sensing element.This optical fiber sensing element is generally fiber grating or optical fiber laser, and optical fiber laser can be distributed Blatt reflective (DBR) laser instrument or distributed feed-back (DFB) optical fiber laser.The two ends of fiber grating or optical fiber laser are separately fixed on primary diaphragm 31 and the secondary diaphragm 32.Simultaneously, spring 30 is in compressive state, and secondary diaphragm 32 is had certain effect power and makes certain initial tensile stress in the optical fiber.Because if optical fiber relaxes, the primary diaphragm 31 that seismic wave causes and the deformation of secondary diaphragm 32 may cause that fiber grating or optical fiber laser produce strain, thereby optical fiber detector can't work.
When seismic signal is arranged, deformation occurs under the effect of primary diaphragm 31 and secondary diaphragm 32 liquid propagation acoustic pressure in well, thereby the output light wavelength that causes fiber grating or optical fiber laser changes with the seismic wave signal, and the variation that detects optical wavelength by ground installation is reducible seismic signal.
When the temperature compensation structure of optical fiber detector that is used for high-temperature oil well was transferred to the shaft bottom by well head, temperature constantly raise, and support tube 10 extends along with the rising generation thermal expansion of temperature.Because the rigidity of spring 30 should be much smaller than the rigidity of the used optical fiber of this optical fiber detector, in temperature-rise period, spring 30 is constantly compressed, thereby optical fiber is unlikely to owing to excessive stress is born in the elongation of support tube 10.When the temperature compensation structure of optical fiber detector that is used for high-temperature oil well is promoted to well head by the shaft bottom, temperature constantly reduces, support tube 10 shortens along with the reduction of temperature, this moment, compressed spring 30 extended gradually, promote secondary diaphragm 32, thereby make optical fiber still be in extended state, can work.In a word, the secondary diaphragm that passes through fixing primary diaphragm 31 and float 32 of this programme is realized temperature-compensating.
The external diameter of boss 11 generally is greater than the external diameter of spring 30, can be movable at the internal freedom of support tube 10 to guarantee spring 30, and by the auto-alignment of optical fiber to two diaphragms of pulling force realization of primary diaphragm 31 and secondary diaphragm 32.
Two end caps 20 have formed the first cavity 25 and the second cavity 26 with primary diaphragm 31 and secondary diaphragm 32 respectively in the both sides of support tube 10.The second hole 21, the first cavitys 25 and the second cavity 26 by end cap 20 sides are in communication with the outside, thereby form the static pressure self-compensation structure, have avoided the destruction of down-hole high pressure to optical fiber detector.Formed structure of resonant cavity with the first cavity 25 and the second cavity 26 respectively owing to the second hole 21 simultaneously, thus acoustic resistance and acoustic capacitance that the size in the second hole 21 can change resonator system changed, thus change the Frequency Response of optical fiber detector.This is very necessary for adopting the geophysical exploration of different qualities wave detector for different geological environments.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. temperature compensation structure of optical fiber detector that is used for high-temperature oil well is characterized in that this structure comprises:
Support tube (10) is for the protection of the optical fiber detector internal construction;
Be installed on two end caps with holes (20) at support tube two ends, be used for the connection of optical cable;
Be installed on a side of support tube (10) and the primary diaphragm (31) between the end cap (20), be used for connecting and fixed fiber;
Be installed on the opposite side of support tube (10) and the secondary diaphragm (32) between the end cap (20), be used for connecting and fixed fiber;
Be installed on the spring (30) that support tube (10) is inner, secondary diaphragm (32) is inboard, be used for supporting secondary diaphragm (32), and the stress in the control optical fiber.
2. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1, it is characterized in that, the central authorities of described support tube (10) have vertically and are no less than one and the uniform pectination hole (12) of hoop, be used for making the inside and outside UNICOM of optical fiber detector, thereby make things convenient for the coupling of seismic signal.
3. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1, it is characterized in that, described end cap (20) is used for drawing the optical fiber except have the first hole (22) at the end axial direction, have at least one second hole (21) in its side, be used for static balance.
4. according to claim 1 or 3 described temperature compensation structure of optical fiber detector for high-temperature oil well, it is characterized in that the frequency response characteristic of this structure is regulated by the diameter that changes the first hole (22).
5. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1, it is characterized in that, the inside, two ends of described carrying cylinder (10) further includes boss (11), is respectively applied to install primary diaphragm (31) and spring (30).
6. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1 is characterized in that, the mounting method of described primary diaphragm (31) is to adopt end cap (20) to be pressed on the boss (11).
7. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1, it is characterized in that, the mounting method of described secondary diaphragm (32) is, spring (30) is installed on the boss (11), after optical fiber and secondary diaphragm (32) fixed, secondary diaphragm (32) is pressed on the spring (30).
8. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1 is characterized in that, between described secondary diaphragm (32) and the mounted end cap (20) space (50) is arranged.
9. the temperature compensation structure of optical fiber detector for high-temperature oil well according to claim 1, it is characterized in that, the position of end cap (20) is installed in the both sides of described support tube (10), further have the 3rd hole (14) in its side, be used for mounting screw or fill glue so that fixing end cap (20).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010231235 CN101922289B (en) | 2010-07-14 | 2010-07-14 | Temperature compensation structure of optical fiber detector for high-temperature oil well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010231235 CN101922289B (en) | 2010-07-14 | 2010-07-14 | Temperature compensation structure of optical fiber detector for high-temperature oil well |
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| CN101922289A CN101922289A (en) | 2010-12-22 |
| CN101922289B true CN101922289B (en) | 2013-03-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104570543B (en) * | 2014-12-19 | 2017-06-13 | 中国科学院理化技术研究所 | A kind of optical frequency variable device for answering force adaptive |
| CN104777582B (en) * | 2015-04-22 | 2017-10-20 | 杭州无创光电有限公司 | A kind of fibre scope motion compensator |
| CN115015824B (en) * | 2022-06-16 | 2024-01-23 | 成都仕芯半导体有限公司 | Logarithmic detector calibration circuit and calibration method and logarithmic detector |
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| US6002646A (en) * | 1997-06-27 | 1999-12-14 | The United States Of America As Represented By The Secretary Of The Navy | Portable optical range tracking array |
| US6160762A (en) * | 1998-06-17 | 2000-12-12 | Geosensor Corporation | Optical sensor |
| CN101201283A (en) * | 2006-12-13 | 2008-06-18 | 中国科学院半导体研究所 | Optical fiber pipe hydraulic sensor |
| CN101210832A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院半导体研究所 | Optical fiber grating sonic device |
| CN101324189A (en) * | 2008-07-28 | 2008-12-17 | 西安石油大学 | External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor |
| CN101598802A (en) * | 2009-06-17 | 2009-12-09 | 中国科学院半导体研究所 | Can be used for land and optical fiber laser detector under water |
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2010
- 2010-07-14 CN CN 201010231235 patent/CN101922289B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6002646A (en) * | 1997-06-27 | 1999-12-14 | The United States Of America As Represented By The Secretary Of The Navy | Portable optical range tracking array |
| US6160762A (en) * | 1998-06-17 | 2000-12-12 | Geosensor Corporation | Optical sensor |
| CN101201283A (en) * | 2006-12-13 | 2008-06-18 | 中国科学院半导体研究所 | Optical fiber pipe hydraulic sensor |
| CN101210832A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院半导体研究所 | Optical fiber grating sonic device |
| CN101324189A (en) * | 2008-07-28 | 2008-12-17 | 西安石油大学 | External pressure type temperature compensation high-temperature high-pressure optical fiber grating sensor |
| CN101598802A (en) * | 2009-06-17 | 2009-12-09 | 中国科学院半导体研究所 | Can be used for land and optical fiber laser detector under water |
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