CN103064153B - Be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa - Google Patents
Be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa Download PDFInfo
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- CN103064153B CN103064153B CN201310025861.0A CN201310025861A CN103064153B CN 103064153 B CN103064153 B CN 103064153B CN 201310025861 A CN201310025861 A CN 201310025861A CN 103064153 B CN103064153 B CN 103064153B
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Abstract
Be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa, possess following all features: comprise Fibre Optical Sensor, sensing optic cable and optical cable gland, Fibre Optical Sensor comprises the first fiber optic tap stretched out, described sensing optic cable is through optical cable gland, and extension is the second fiber optic tap; Described first fiber optic tap, the second fiber optic tap end are fixedly connected with, and near tie point, fiber optic tap part only comprises fiber core and covering.Described first fiber optic tap and the peripheral integral coating of the second fiber optic tap have internal diameter to be greater than the sealing shroud of complete optical fiber external diameter, thus form optical fiber redundant space between sealing shroud and tie point.The present invention has peeled off coating to the optical cable near fiber connection points, forms an optical fiber redundant space, fibre-optical splice can be allowed not to be subject to the effect of external force and stress, effectively protect tie point; Ensure that the joint of sensor and sensing optic cable has good physical strength and bend resistance ability.
Description
Technical field
The invention belongs to the communications field, relate to a kind of logging sensor connection encapsulation device being suitable for temperature 300 degrees Celsius, pressure 50MPa.
Background technology
Optical fiber sensing technology is the New Sensing Technology that 20 century 70s develop rapidly with the development of Fibre Optical Communication Technology.The applied research of more external developed countries to optical fiber sensing technology acquires a great achievement, and many optical fiber sensing systems are practical, become the commodity of alternative traditional sensors.
The typical structure of optical fiber is a kind of elongated multilayer coaxial cylindrical entity composition fiber.Be from inside to outside: fibre core (sandwich layer) → covering → coat.Core is fibre core and covering, and the two forms dielectric optical waveguide jointly, forms the conduction to light signal and constraint, realizes the transmission of light, so again the two optical fiber formed is called bare fibre.Principal ingredient because of bare fibre is silicon dioxide, and it is a kind of fragility friable material, and bending resistance is poor; poor toughness, for improving the microbend performance of optical fiber, applies one deck polymeric coating layer usually again; coat, also known as coating, is one deck polymeric coating layer, mainly provides mechanical protection to bare fibre.
In the performance history in oil field, people need know that this will use oil well logging about the holding property of in-hole fluid and the particulars of state in production fluid or the injecting process, its reliability and accuracy most important.And traditional electronic sensor cannot work under down-hole rugged environment such as high temperature, high pressure, the ground electrical interference of burn into earth magnetism.Fibre Optical Sensor can overcome these difficulties, it is insensitive and can bear extreme condition to electromagnetic interference (EMI), comprise high temperature, high pressure (more than tens MPas) and strong shock and vibration, pit shaft and well site environmental parameter can be measured accurately, simultaneously, Fibre Optical Sensor has distributed measurement ability, can measure measured space distribution, provide profile information.And Fibre Optical Sensor cross-sectional area is little, and profile is short, take up space in the wellbore minimum.
Transmit data for convenience, Fibre Optical Sensor is connected with fiber optic tap to be connected with sensing optic cable, and conventional art adopts the connected mode of coated one deck hermetically sealed case in junction after direct welding, and junction bad mechanical strength, bend resistance ability is weak.
Summary of the invention
For overcoming conventional art in optical cable sensor and sensing optic cable junction bad mechanical strength, the technological deficiency that bend resistance ability is weak, the invention provides one and being suitable for temperature 300 degrees Celsius, pressure 50MPa(MPa) logging sensor connection encapsulation device.
The logging sensor connection encapsulation device being suitable for temperature 300 degrees Celsius, pressure 50MPa of the present invention, comprise Fibre Optical Sensor, sensing optic cable and optical cable gland, Fibre Optical Sensor, comprise the first fiber optic tap stretched out, described sensing optic cable is through optical cable gland, and extension is the second fiber optic tap;
Described first fiber optic tap, the second fiber optic tap end are fixedly connected with; Described first fiber optic tap and the second fiber optic tap periphery are coated with the sealing shroud that internal diameter is greater than fibre external diameters near tie point, thus form optical fiber redundant space between sealing shroud and tie point; Preferably, also comprise the protection overcoat be enclosed within outside tie point, described protection lagging material is teflon.
Preferably, described tie point is also coated with protection resin outward.
Further, described protection resin is polyimide resin.
Preferably, described sealing shroud comprises sealed liner and is enclosed within the hermetically sealed case outside sealed liner.
Preferably, the length of described optical fiber redundant space is 1:1.2 to 1:1.5 with the sensing optic cable length ratio be connected.
Preferably, also comprise and be positioned at sealing shroud near sensor one end, sealing shroud sealing is locked sensor nut on a sensor and gasket seal.
Preferably, the optical cable cassette chuck of clamping optical cable gland and the optical cable set nut of fastening optical cable cassette chuck is also comprised.
Adopt the logging sensor connection encapsulation device being applicable to temperature 300 degree, pressure 50MPa environment of the present invention, coating has been peeled off to the optical cable near fiber connection points, form an optical fiber redundant space, fibre-optical splice can be allowed not to be subject to the effect of external force and stress, effectively protect tie point; Ensure that the joint of sensor/sensor and sensing optic cable has good physical strength and bend resistance ability.
Accompanying drawing explanation
Fig. 1 illustrates a kind of specific implementation of logging sensor connection encapsulation device being suitable for temperature 300 degrees Celsius, pressure 50MPa of the present invention;
In each figure, Reference numeral name is called: 1. Fibre Optical Sensor, 2. sensor pressure cap, 3. gasket seal; 4. sensor nut, 5. the first fiber optic tap, 6. the second fiber optic tap; 7. tie point, 8. nurse tree lipid layer, 9. protect overcoat; 10. optical fiber redundant space, 11. hermetically sealed cases, 12. sealed liner 13. optical cable gland bayonet sockets; 14. optical cable glands, 15. optical cable cassette chucks, 16. sealant layers; 17. optical cable set nuts, 18. sensing optic cables, the sensing optic cable length that A. connects.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The logging sensor connection encapsulation device being suitable for temperature 300 degrees Celsius, pressure 50MPa of the present invention, comprise Fibre Optical Sensor 1, sensing optic cable 18 and optical cable gland 14, Fibre Optical Sensor comprises the first fiber optic tap 5 stretched out, described sensing optic cable is through optical cable gland 14, and extension is the second fiber optic tap 6;
Described first fiber optic tap 5, second fiber optic tap 6 end is fixedly connected with; Described first fiber optic tap 5 and the second fiber optic tap 6 periphery are coated with the sealing shroud that internal diameter is greater than fibre external diameters near tie point, thus between sealing shroud and tie point, form optical fiber redundant space 10.
Traditional fiber connects the connected mode adopting after welding direct coated one deck sealing shroud again in junction, and junction bad mechanical strength, bend resistance ability is weak.The present invention adopts internal diameter to be greater than the sealing shroud of fibre external diameters near tie point in junction, make to form an optical fiber redundant space between sealing shroud and tie point.When junction sealing shroud is by external force deformation, due to the existence of optical fiber redundant space, the distortion of sealing shroud can not be directly delivered to inner fiber optic tap junction, and optical fiber redundant space makes the deformable allowed band of junction increase, and improves physical strength and the bend resistance ability of junction.
Structure optical fiber redundant space can adopt internal diameter to be greater than the sealing shroud of fibre external diameters, but it is preferred, the hermetically sealed case that internal diameter is identical with complete optical fiber external diameter can be adopted, fiber optic tap part near tie point is peeled off simultaneously, whole coat can be peeled off and only retain fiber core and covering, also can as required, released part coat forms the optical fiber redundant space of different-thickness.
According to different fibre diameters and optical fiber redundant space external diameter, optical fiber redundant space length arranges difference, inventor is through overtesting, the length finding optical fiber redundant space and the sensing optic cable length be connected are than during for 1:1.2 to 1:1.5, the bend resistance performance of junction and sealing property better, further, above-mentioned length, than during for 1:1.3, obtains best practical function.The so-called sensing optic cable length connected is optical fiber redundant space near sensing optic cable end face to the distance of optical cable gland away from optical fiber redundant space, as the distance A indicated in accompanying drawing.
For improving the mechanical property of fiber connection points further; protecting sheathing can also be overlapped outward at tie point; teflon (being commonly called as Teflon) has sealing, height lubricates not viscosity, electrical insulating property and good ageing resistance, heatproof excellence (can long-term work at the temperature of+250 DEG C to-180 DEG C), does not have toxicity to people.The thinner thickness of protecting sheathing, is generally 0.1 to 0.5 millimeter, and length is arranged on 25-50 millimeter, to keep the pliability of junction.
Put protecting sheathing again after can also coating protection resin outside tie point in advance, to protect tie point, preferably use polyimide resin, polyimide resin is widely used in cable optic fibre as insullac, is also a kind of excellent high-temperature resistant coating simultaneously.
Below provide a specific embodiment of the present invention:
Pass optical cable gland 14 after first sensor fibre 18 surface smear fluid sealant being formed sealant layer 16, then carry out cutting polishing; The gasket seal 3 of Fibre Optical Sensor is arranged on Fibre Optical Sensor 1; The coat of outside is all peeled off with second fiber optic tap 6 that will be connected by the first fiber optic tap 5 that Fibre Optical Sensor stretches out; overcoat will be protected in advance through fiber optic tap; and then carry out the welding of two fiber optic taps; on fusion point, smear protection resin after welding form nurse tree lipid layer 8; then protection overcoat 9 is socketed on fusion point, to ensure intensity and the quality of fusion point.
After above-mentioned fused fiber splice and protection work complete, sealed liner 12 is installed between the pressure cap 2 and optical cable gland 14 of Fibre Optical Sensor, then hermetically sealed case 11 is arranged on outside sealed liner 12, sensing optic cable end optical cable cassette chuck clamps, fastened sensors nut 4 and through the optical cable set nut 17 of optical cable cassette chuck 15, by sensing optic cable and hermetically sealed case fastening; Then on optical cable gland bayonet socket 13, carry out repeatedly roll extrusion sealing.
Hermetically sealed case is arranged on outside fusion point, and corrosion resistivity requires higher, and hermetically sealed case outside surface can smear corrosion-resistant coating.Sealed liner then requires good mechanical property, and material capability should be better than hermetically sealed case, if same material, then the thickness of sealed liner is greater than hermetically sealed case thickness usually.
Sensor pressure cap 2, optical cable gland 14, sealed liner 12, hermetically sealed case 11, sensor nut 4, optical cable set nut 17 for the trade mark be 304, in the steel of 304L or 306 any one.
Described optical cable gland 14, Fibre Optical Sensor metallic gasket 3 material are 45# steel, Cr after modified
12, Cr
12any one of MoV or other mould steel.Cr12 is high carbon and chromium ledeburite steel, and Cr12MoV is the GB title of steel industry, refers to the steel meeting this standard here, and the hardness after Cr12MoV mould steel quenching degree, Q-tempering, intensity, toughness are all better than CR12 steel.So-called modified be the known technology of steel field of smelting, refer to quenching+high tempering; Namely first quench, after quenching, carry out high tempering again.Modified fundamental purpose obtains all reasonable comprehensive mechanical performance of intensity, plasticity.
Optical fiber in sensor fibre of the present invention and Fibre Optical Sensor be applicable to common multimode, single-mode fiber, polyimide coated fiber, coating metal optical fiber any one or multiple.
By multiple protective, the present invention can ensure that the joint of Fibre Optical Sensor and sensing optic cable has good physical strength and bend resistance ability; Run in the space can ensure that in sensor/sensor and sensing optic cable, optical fiber can remain on independently by repeatedly sealing, completely cutting off, because its good isolation performance effectively extends the serviceable life of optical cable and sensor, allow test macro is long-term, continual is operated in mensuration plane.
In this device, all metal materials all adopt the intermetallic composite coating that resistance to corrosion is stronger, and the foregoing trade mark is 304, the steel of 304L or 306, and 45# steel, the Cr after modified
12, Cr
12the materials such as MoV or other mould steel, corrosion environment complicated, stronger under being highly resistant to oil well; The optical fiber redundant space formed through unique design can allow fibre-optical splice not be subject to the effect of external force and stress, effectively protects fusion point.
Because this device has sealing property good under long term high temperature, can resistance to up to 300 DEG C of high temperature, anti-10000N with upper pulling force, anti-50MPa, even 100MPa is with upward pressure, the excellent properties such as anticorrosive, working environment complicated under tackling oil well; This device is applicable to environmental parameter and transmission coherent signal (as liquid bit-plane depth etc.) of measuring pit shaft and well site in the environment of the very severes such as oil well vapour well, and can accurately measure, expanded the application of Fibre Optical Sensor, can to exploration drill through work provide lasting, for a long time, measurement parameter accurately.
Previously described is each preferred embodiment of the present invention, preferred implementation in each preferred embodiment is if not obviously contradictory or premised on a certain preferred implementation, each preferred implementation can stack combinations use arbitrarily, design parameter in described embodiment and embodiment is only the invention proof procedure in order to clear statement inventor, and be not used to limit scope of patent protection of the present invention, scope of patent protection of the present invention is still as the criterion with its claims, the equivalent structure change that every utilization instructions of the present invention and accompanying drawing content are done, in like manner all should be included in protection scope of the present invention.
Claims (8)
1. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa, comprise Fibre Optical Sensor (1), sensing optic cable (18) and optical cable gland (14), Fibre Optical Sensor (1) comprises the first fiber optic tap (5) stretched out, described sensing optic cable (18) is through optical cable gland (14), and extension is the second fiber optic tap (6);
It is characterized in that: described first fiber optic tap (5), the second fiber optic tap (6) end are fixedly connected with, and described first fiber optic tap (5) and the second fiber optic tap (6) periphery are coated with the sealing shroud that internal diameter is greater than fibre external diameters near tie point, thus between sealing shroud and tie point, form optical fiber redundant space (10);
Also comprise the protection overcoat (9) be enclosed within outside tie point; Described protection overcoat (9) material is teflon.
2. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 1, it is characterized in that: described tie point also has nurse tree lipid layer (8) outward.
3. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 2, it is characterized in that: described nurse tree lipid layer (8) is polyimide resin.
4. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 1, it is characterized in that: described sealing shroud comprises sealed liner (12) and is enclosed within the hermetically sealed case (11) outside sealed liner.
5. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 1, it is characterized in that: the optical fiber near described tie point only comprises fiber core and covering.
6. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 1, it is characterized in that: the length of described optical fiber redundant space (10) is 1:1.2 to 1:1.5 with the sensing optic cable length ratio be connected.
7. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 1, it is characterized in that: also comprise and be positioned at sealing shroud near Fibre Optical Sensor one end, sealing shroud is sealed the sensor nut (4) and gasket seal (3) that are locked on Fibre Optical Sensor.
8. be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa as claimed in claim 1, it is characterized in that: also comprise the optical cable cassette chuck (15) of clamping optical cable gland and the optical cable set nut (17) of fastening optical cable cassette chuck (15).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025861.0A CN103064153B (en) | 2013-01-24 | 2013-01-24 | Be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025861.0A CN103064153B (en) | 2013-01-24 | 2013-01-24 | Be suitable for the logging sensor connection encapsulation device of temperature 300 degrees Celsius, pressure 50MPa |
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| Publication Number | Publication Date |
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| CN103064153A CN103064153A (en) | 2013-04-24 |
| CN103064153B true CN103064153B (en) | 2015-09-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5849847B2 (en) * | 1980-08-02 | 1983-11-07 | 日本電信電話株式会社 | Connection structure of submarine optical cable |
| CN101709638B (en) * | 2009-11-24 | 2012-09-26 | 山东省科学院激光研究所 | Novel optical fiber temperature and pressure sensor |
| CN201724688U (en) * | 2010-06-24 | 2011-01-26 | 上海启鹏工程材料科技有限公司 | Fiber bragg grating sensor for building and structure healthy detection |
| CN203101683U (en) * | 2013-01-24 | 2013-07-31 | 四川汇源光通信有限公司 | Well-logging sensor connector packaging apparatus suitable for temperature of 300 DEG and pressure of 50MPa |
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