CN101178007B - Diaphragm-type optical-fiber intelligent well pressure and temperature sensing unit - Google Patents
Diaphragm-type optical-fiber intelligent well pressure and temperature sensing unit Download PDFInfo
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- CN101178007B CN101178007B CN2007101789310A CN200710178931A CN101178007B CN 101178007 B CN101178007 B CN 101178007B CN 2007101789310 A CN2007101789310 A CN 2007101789310A CN 200710178931 A CN200710178931 A CN 200710178931A CN 101178007 B CN101178007 B CN 101178007B
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Abstract
The invention relates to a diaphragm type pressure and temperature sensor for fiber optical intelligent well, pertaining to the technology field of intelligent well. The invention comprises a broadband light source, a modularization spectrometer, a data transmission line, a data processor, a first section of optical fiber, a second section of optical fiber, an optical fiber coupler, optical cable, one or more diaphragm type optical fiber temperature and pressure two-parameter sensor probe(s). The broadband light source is connected with the input end of the optical fiber coupler through the second section of optical fiber; one output end of the optical fiber coupler is connected with the optical cable and the other output end with the input end of the modularization spectrometer through the first section of optical fiber and the modularization spectrometer is connected with the data processor through the data transmission line; the diaphragm type optical fiber temperature and pressure two-parameter sensor probe is at the other end of the optical cable. The invention has the advantages of good stability under high temperature and pressure, corrosion resistance, long service life, accurate measure, no spark and safe application, etc. being suitable for application at much narrower space under a well to meet the demand for monitoring conditions under the well.
Description
Technical field
The invention belongs to the smart well technology field,, can read diverse location or the temperature of different oil reservoirs and the full Fibre Optical Sensor of pressure in the oil well in real time particularly by the demodulator on optical cable and ground.
Background technology
Smart well technology starts from the nineties in 20th century, improves under the main trend of oil reservoir production capacity in global petroleum industry at that time, and smart well technology develop also commercialization.The research and development of this technology make many original unworkable marginal oil fields obtain exploitation, for the exploitation of deep water, sea, outlying district and old filed has brought hope.So-called smart well is exactly that sensor, the data transmission system that can the obtain down-hole oil gas production information control appliance of unifying has been installed in well, and can carry out that data are collected and the well of decision analysis on ground.Can carry out Long-distance Control by smart well, reach the purpose of optimizing production capacity.Use smart well technology and can carry out Long-distance Control, the cross flow one of avoiding different reservoir pressures to bring to the inflow and the outflow of a plurality of reservoir fluids by a bite well.Adopt for heavy wool is laminated, the application of intelligent completion allows alternately to exploit the upper and lower payzone, has accelerated the speed of production of whole well, has also improved the net present value (NPV) of oil well.The telemanagement of oil reservoir makes that the operating personnel need not well is carried out physical interventions, has reduced the cost of potential workover treatment.Under the condition of rig time (especially in deep water or seabed) cost costliness, the reduction of workover cost can bring significant benefit, has also remedied the output of losing owing to well workover simultaneously.In addition, the injection well of using intelligent completion can carry out water filling control better, improves the ultimate recovery of oil well.Simultaneously, using the smart well system also can reduce the surface based construction and execute cost.The purpose of smart well technology is to improve the oil mining rate, improves the oil field automation controlling level, reduces oilfield operations cost and equipment cost, thereby realizes long-range economic benefit.
Core component in the smart well technology is a permanent oil well sensing, and it is responsible for providing earthward the pressure and temp data.Along with the continuous exploitation in oil field, the degree of depth of oil gas well constantly increases, and the operating ambient temperature of sensor is also more and more higher.The conditional electronic sensor has been difficult to satisfy the demand.According to foreign statistic, 18 ℃ of the every risings of downhole temperature, the fault rate of electronic sensor just improves 1 times.Royal Dutch Shell to the analysis showed that of 952 permanent oil well sensings of electronics, is being lower than under 100 ℃ the continuous operation environment in the period of 1987-1998, and 12% sensor lost efficacy in 1 year, and 31% lost efficacy in 5 years.U.S. Quartzdyne company surpasses 450 high-temperature electronic sensors to it and tests under 180 ℃ of environment, surpasses 60% sensor failure in 3 months, and in 6 months, all sensors lost efficacy.Therefore, electronic sensor generally is used for being lower than 100 ℃ oil well.The temperature of some deep-sea oil wells has reached 200-250 ℃, and the temperature of thick oil filling gas well is up to 300 ℃.In these applied environments, electronic sensor can't meet the demands fully.
Compare with electronic sensor, the advantage of Fibre Optical Sensor is high temperature resistant, anticorrosive, anti-electromagnetic interference, safe in utilizationly do not strike sparks, volume is little.These advantages make it launch gradually to use in the oil field in late 1990s.In August, 2002, Norsk Hydro ASA company has finished Fibre Optical Sensor smart well more than first mouthful in the industry.The optical fiber measurement system is installed in the E-11C well of Oseberg east, North Sea Norway marine site, is included in a plurality of optical fiber pressures and temperature pick up and ground controlling intelligence completion flow control device are installed in the well.All Fibre Optical Sensors are all produced by Weatherford company.There is U.S. Sabeus company in addition in the company that carries out at present the exploitation of smart well optical fiber pressure temperature pick up sensor abroad, U.S. Baker-Hughs company, Canadian FISO company, Brazilian Gavea company or the like.The present product of these companies is all used towards the pressure measurement of smart well single-point thermometric.
At present, the structure of smart well single-point pressure and temperature Fibre Optical Sensor mainly is based on and a kind ofly is connected on same cascade structure on the optical fiber successively so that fiber grating and optical fiber Fabry-Paro interference cavity are separated by a distance.Wherein, fiber grating is used for measures ambient temperature, and optical fiber Fabry-Paro interference cavity is used for measurement environment pressure.Because optical fiber Fabry-Paro interference cavity has bigger temperature and crosstalks, therefore need come the pressure measurements of compensated optical fiber Fabry-Paro interference cavity, thereby obtain correct ambient value with the environment temperature that the optical fiber grating measuring goes out.
There are following two subject matters in this structure: 1. because the smart well Fibre Optical Sensor adopts all is the LASER Light Source of high coherence, long coherence distance, if therefore the spacing of fiber grating and optical fiber Fabry-Paro interference cavity is too small, then the reverberation of the reverberation of fiber grating and optical fiber Fabry-Paro interference cavity will interfere in same optical fiber, influence greatly temperature measurement accuracy, and then influence the precision that the pressure rings temperature compensation is repaid, thereby influence the precision of force value.For fear of the interference between two sensors, must make spacing between two sensors greater than the coherence distance of LASER Light Source, its representative value is 600mm.But separated by a distance when two sensors, can't guarantee that then the environment temperature that two sensors are experienced is same value.Therefore, the ring temperature compensation of fibre optic compression sensor repaid deviation to occur, thereby influence the precision of force value; 2. optical fiber Fabry-Paro interference cavity is based on quartz glass and metal material, therefore can long-term work at higher temperature, as 300 ℃.The operating principle of fiber grating is based on the structure with a kind of refractive index cycle modulation of ultraviolet curing in optical fiber.To such an extent as to and the structure of this refractive index can disappear in long-term hot operation in reduction, has reduced the signal to noise ratio of sensor greatly, thereby has influenced thermometric pressure measurement precision.Therefore the maximum temperature that fiber grating can long-term work generally is no more than 150 ℃.
More than two problems make the size of this type optical fiber sensor bigger than normal, precision is not high and maximum operating temperature is on the low side.From the development trend in present oil field, to hold increasing control pipeline and instrument cable in the limited space, down-hole, therefore can be harsh gradually to the dimensional requirement of sensor.In addition, along with the degree of depth of oil well is deepened gradually, processing temperature will be more and more higher, and the oil well quantity that is higher than 150 ℃ is progressively increasing.In sum, based on the optical-fiber intelligent well sensor of fiber grating because Effect on Performance has directly limited its application in the smart well system.
Summary of the invention
Purpose of the present invention is intended to solve under hot environment, in the limited underground work space, the problem of long-term measuring well downforce of Fibre Optical Sensor and temperature, a kind of diaphragm-type optical-fiber intelligent well pressure and temperature pick up are proposed, it is little to have volume, can under hot environment, use for a long time, can monitor the characteristics of pressure and temperature in the oil well simultaneously.Be applicable to the pressure and the temperature survey in fields such as oil field, chemical industry.
Diaphragm-type optical-fiber intelligent well pressure and temperature pick up that the present invention proposes, it is characterized in that, comprising: wideband light source, modular optical spectrometer, data line, data processor, first section optical fiber, second section optical fiber, fiber coupler, optical cable and one or more diaphragm-type optical-fiber temperature and pressure two parameter sensor probes; Described wideband light source links to each other with the input of fiber coupler by second section optical fiber, an output of this fiber coupler links to each other with optical cable, another output links to each other with the input of modular optical spectrometer by first section optical fiber, and this modular optical spectrometer links to each other with data processor by data line; Described diaphragm-type optical-fiber temperature and pressure two parameter sensor probes are at the other end of optical cable.
An above-mentioned above diaphragm-type optical-fiber temperature and pressure two parameter sensor probes can be distributed in the optical cable on the same optical fiber.
Above-mentioned diaphragm-type optical-fiber temperature and pressure two parameter sensor probes can be made up of fixator and the optical fiber, the diaphragm that are arranged in this fixator, described fiber end face and diaphragm lay respectively at the both ends of the surface of the cavity in the fixator, and fixator is used for each assembly fixed and forms the sensing head of an integral body.
The said fixing device can be served as reasons up and down, and the top cylindrical drum and the lower cylindrical tube of two different-diameters combine, there is a through hole at the fixator center, be used for fixing the light-conductive optic fibre that stretches into wherein, this top cylindrical drum is connected, seals with the oil well optical cable and fix by the outer jointing jacket tube of oil well optical cable; The lower cylindrical tube of fixator has a cavity, and the bottom of fixator has the groove that is used to install diaphragm.
Above-mentioned fibre optic compression sensor probe can be made of the upper surface of the end face of this light-conductive optic fibre, diaphragm on the other side and the fixator cavity between fiber end face and the diaphragm, and the degree of depth of this cavity is that the initial cavity of fibre optic compression sensor is long.
Above-mentioned fibre optic temperature sensor probe can be made of two surfaces and the diaphragm itself of described diaphragm.
Described diaphragm material can adopt and contain SiO
2Dielectric material or optical crystal material a kind of.
One or two surface of described diaphragm can be useful on the plated film that improves reflectivity; The membrane material of described plated film can adopt metal material or oxide material.
Characteristics of the present invention and effect:
It is that 150 ℃, the highest instantaneous operating temperature are that 300 ℃ operating temperature limits that the diaphragm-type optical-fiber intelligent well pressure that the present invention proposes and temperature pick up have been broken through long-term work temperature based on the Fibre Optical Sensor of fiber grating principle.Through actual measurement, the sensor that the present invention proposes can long-term stable operation at 300 ℃.Therefore, fiber-optic sensor probe of the present invention is applicable to the high temperature and high pressure environment in oil exploration and the exploitation.In addition, this sensor probe is compared the sensor probe miniaturization more based on fiber grating.Its axial dimension drops to about 1mm from about the 600mm based on the sensor probe of fiber grating, therefore is fit to be installed in the sleeve and the small space between the oil pipe of oil well.In addition, the size of sensor probe of the present invention reduces effectively to overcome because therefore the influence that the temperature-compensating that temperature non is popped one's head in to pressure sensor brings will further improve precision and the resolution ratio that pressure sensor is popped one's head in.Based on the fiber-optic sensor probe of Bragg grating the spectral resolution of modular optical spectrometer there is very high requirement, reaches the magnitude of 10pm, thereby bring the raising of cost.And certainty of measurement of the present invention reduces greatly to the resolution ratio dependence of modular optical spectrometer, only needs the resolution ratio of 100pm can reach same precision, thereby makes cost descend, and is suitable for coml and promotes.In addition, the core component of this sensor adopts nonmetal non-organic material, has HTHP good stability, corrosion-resistant, long service life, measurement accurately, is not struck sparks and advantage such as safe in utilization.This sensor exists widely at petrochemical industry to be used.
Description of drawings
Fig. 1 is an oil well sensing general structure schematic diagram of the present invention.
Fig. 2 A is the fixator example structure schematic diagram of a kind of optical fiber pressure temperature two parameter sensor probes of the present invention.
Fig. 2 B is a kind of optical fiber pressure temperature two parameter sensor probe structural representations of the fixator of employing Fig. 2 A.
Fig. 2 C is the optical texture schematic diagram of the optical fiber pressure temperature two parameter sensor probes of demonstration Fig. 2 B.
Fig. 3 A is the reflectance spectrum of fibre optic compression sensor probe.
Fig. 3 B is the long and ambient pressure curve in the cavity chamber of typical fibre optic compression sensor probe.
Fig. 3 C is the long and ambient temperature curve in the cavity chamber of typical fibre optic compression sensor probe.
Fig. 4 A is the reflectance spectrum of fibre optic temperature sensor probe.
Fig. 4 B is the long and ambient temperature curve of the equivalent cavity of typical fibre optic temperature sensor probe.
The specific embodiment
Diaphragm-type optical-fiber intelligent well pressure and temperature pick up that the present invention proposes reach embodiment in conjunction with the accompanying drawings and are described in detail as follows:
General structure of the present invention comprises as shown in Figure 1: wideband light source 1, modular optical spectrometer 2, data line 3, data processor 4, optical fiber 5, optical fiber 6, fiber coupler 7, optical cable 8 and diaphragm-type optical-fiber temperature and pressure two parameter sensor probes 14; Described wideband light source 1 links to each other with the input of fiber coupler 7 by optical fiber 6, an output of this fiber coupler 7 links to each other with optical cable 8, another output links to each other with the input of modular optical spectrometer 2 by optical fiber 5, and this modular optical spectrometer 2 links to each other with data processor 4 by data line 3; Described fiber optic temperature and pressure two parameter sensor probes 14 are distributed in the other end of optical cable 8.
An above-mentioned above diaphragm-type optical-fiber temperature and pressure two parameter sensor probes can be distributed in the optical cable on the same optical fiber.
Operating principle of the present invention is: the light that sends from wideband light source 1 injects the optical cable 8 that is made of optical fiber through the coupling injection fibre via fiber coupler 7; Be distributed with diaphragm-type optical-fiber temperature and pressure two parameter sensor probes on the optical cable 8; Diaphragm-type optical-fiber temperature and pressure two parameter sensor probes are modulated its reflectance spectrum respectively under the pressure and temperature action in the external world; By fibre optic temperature sensor probe and the fiber-optic pressure sensor head reverse optical cable 8 that passes through once more of spectrum of reflected light respectively, via fiber coupler 7 injection module spectrometers 2; Modular optical spectrometer 2 is converted into spectroscopic data with input spectrum, transfers to data processor 4; Data processor obtains following spectroscopic data: the reflected spectrum data of fibre optic compression sensor probe, the reflected spectrum data of fibre optic temperature sensor probe; Data processor obtains the characteristic parameter of each diaphragm-type optical-fiber temperature and pressure two parameter sensor probes to this two classes spectroscopic data difference analyzing and processing; Each the diaphragm-type optical-fiber temperature that data processor will obtain and the characteristic parameter of pressure two parameter sensor probes contrast with the characteristic parameter calibration curve that is stored in each diaphragm-type optical-fiber temperature and pressure two parameter sensor probes in the data processor, thereby obtain the temperature and pressure reading of each diaphragm-type optical-fiber temperature and pressure two parameter sensor probes.
A kind of embodiment of the present invention is: wideband light source 1 adopts the HFE4854 high-capacity LED of U.S. Honeywell company; The modular optical spectrometer adopts the USB4000 micro spectrometer of U.S. Ocean Optics company; Data line 3 uses the USB transmission line; Data processor 4 uses the microcomputer that has USB interface; The single-mode fiber that optical fiber 5 and optical fiber 6 adopting quartz glass are made is as the SMF28 single-mode fiber of U.S. Corning company; Fiber coupler 7 uses A level three port photocirculators of Shanghai vast space company; Optical cable 8 can adopt the oil well special optical cable.
Diaphragm-type optical-fiber temperature of the present invention and pressure two parameter sensor probes are made up of fixator and the optical fiber, the diaphragm that are arranged in this fixator, described fiber end face and diaphragm lay respectively at the both ends of the surface of the cavity in the fixator, and fixator is used for each assembly fixed and forms the sensing head of an integral body.A kind of example structure of fixator is shown in Fig. 2 A, and fixator is one to be combined by the up and down cylindrical drum 15 and the cylindrical drum 16 of two different-diameters, and there is a through hole 17 at the fixator center, is used for fixing the light-conductive optic fibre that stretches into wherein.The top cylindrical drum 16 of fixator is connected, seals with the oil well optical cable by outer 13 protection sleeves of the metal of oil well optical cable and be fixing.The lower cylindrical tube 15 of fixator has a cavity 18 (initial cavity that its degree of depth is the fiber-optic pressure sensor head is long).The bottom of fixator has the groove 19 that is used to install diaphragm.A kind of embodiment of fixator is: the fixator material is selected the 316L low carbon stainless steel of resistance to chemical attack for use, and cylindrical drum 15 external diameters are that 6.8mm, length are 5mm, and cylindrical drum 16 external diameters are that 3.3mm, length are 20mm.The diameter of through hole 17 is 0.4mm.The diameter of groove 19 is 4mm, and the degree of depth is 1mm.The diameter of cavity 18 is 3mm, and the degree of depth is 80 microns.
The diaphragm-type optical-fiber pressure and temp sensing head example structure that adopts the fixator shown in Fig. 2 A is shown in Fig. 2 B.Among the figure, optical fiber 8 stretches in the through hole 17 on the fixator, at through hole two ends 22 and 23 places by the seal sealing with fixing.Be fixed on the lower surface that diaphragm 24 on the groove 19 is installed in the groove 19 and is in cavity 18, diaphragm 24 and groove 19 by sealing and fixture 25 sealings with fixing.The metal outer jointing jacket tube 21 of optical cable is connected and sealing by seal 20 with the external wall of upper portion 16 of fixator.The embodiment of this optical fiber pressure temperature pick up is as follows: optical fiber 8 adopts the SMF28 single-mode fiber of U.S. Corning company, and seal 20 can adopt laser weld or argon arc welding.21 adopt 316L low carbon stainless steel material, and seal 22 adopts the 353ND High temp. epoxy resins of U.S. Epotek company with seal 25.
The optical texture of the diaphragm-type optical-fiber pressure and temp two parameter sensor probes of present embodiment is shown in Fig. 2 C.The assembly of fiber-optic pressure sensor head is: the upper and lower surface 27 and 28 of the end face 26 of optical fiber 8, cavity 18, diaphragm 24, diaphragm 24.The typical thickness of diaphragm 24 is 280 microns.The material of diaphragm 24 can be selected but be not limited to quartz glass, melten glass, boronation glass etc. to contain SiO
2Dielectric material; Maybe can select but be not limited to the crystalline material of sapphire, ruby etc.The material of diaphragm 24 has in the wave-length coverage of wideband light source and absorbs for a short time, and the characteristics that transmitance is high should be controlled in the 2dB the one way absorption loss of the light of wideband light source 1.Plated film can be selected in one or two surface of diaphragm 24, to improve or the assurance reflectivity.Coating Materials can be selected metal material or oxide material: as aluminium, silver, gold, silica etc.Requirement to Coating Materials is: the high temperature tack is good, and is high temperature resistant, to the absorption loss of wideband light source 1 less than 3dB, to the absorption inhomogeneities of the light in the bandwidth of wideband light source 1 less than 1dB.Adopt in the present embodiment that 15nm is thick, purity is 99.999% golden film, its reflectivity brings up to 0.37 from 0.04.
Shown in Fig. 2 C, the fibre optic compression sensor probe is based on the two-beam interference principle, be made of the fixator 15 of upper surface 27, fixed fiber and the diaphragm relative position of the end face 26 of optical fiber 8, diaphragm on the other side 24 and the cavity 18 between fiber end face and the diaphragm, the degree of depth of this cavity 18 is that the initial cavity of fibre optic compression sensor probe is long.Optical fiber 8 is used for the photoconduction of wideband light source 1 is popped one's head in to pressure sensor, and the reflectance spectrum of collection and propagation pressure sensor probe.Fiber end face 26 is used to form the reflection of first face.The reflection that the upper surface 27 of diaphragm produces second face.Optical fiber and diaphragm all are fixed on the fixator 15, thereby the normal of assurance optical fiber 8 is perpendicular to diaphragm 24 surfaces.Diaphragm 24 can deform under the pressure differential of ambient pressure and internal cavities pressure, thereby the chamber that changes cavity 18 is long.
The reflectance spectrum I (λ) of fibre optic compression sensor probe is explained by formula 1 with the relation of the long L in cavity chamber
Wherein λ is a wavelength, and I (λ) is a reflectance spectrum, I
s(λ) be wideband light source spectrum, L is long for the cavity chamber, and γ is the interference fringe contrast.Therefore, can pass through processing, obtain the long L in current cavity chamber the reflectance spectrum I (λ) of fibre optic compression sensor probe.Initial cavity chamber length is that the reflectance spectrum of 80 micron fiber pressure sensors probe under 0MPa and 10MPa ambient pressure is respectively as dotted line among Fig. 3 A and solid line.The long variation relation with ambient pressure in cavity chamber is explained by formula 2
Wherein L, L
0, P, Pi, r, μ, E, h be respectively when ante-chamber length, initial cavity length, ambient pressure, cavity inside pressure, diaphragm radius, the poisson's ratio of diaphragm material, the yang type modulus of diaphragm material, the thickness of diaphragm.The long L in cavity chamber of fibre optic compression sensor and the variation relation of ambient pressure P are shown in Fig. 3 B, and what wherein show is 3 duplicate measurements, represents with different line styles respectively, wherein, the 1st line for the band square frame, the 2nd line, the 3rd line for the band circle for the band stain.The result shows that the repeatability of this sensor probe is good.Because the distance between the tie point of the tie point of the coefficient of thermal expansion that fixator 15 existence be can not ignore and the upper surface 28 of diaphragm 24 and fixator and the end face 26 of optical fiber 8 and fixator 15 be can not ignore, therefore the fibre optic compression sensor probe exists temperature to crosstalk, by formula 3 statements
L＝L
0+Gε(T-T
0) (3)
Wherein L, L
0, G, ε, T, T
0Be respectively long when ante-chamber, initial cavity long, distance, the coefficient of thermal expansion of fixator, Current Temperatures, initial temperature between the tie point of the end face 26 of the tie point of the upper surface 28 of diaphragm 24 and fixator and optical fiber 8 and fixator 15.The variation relation of cavity chamber length and ambient temperature has shown the result of 3 measurements among the figure shown in Fig. 3 C, represents with different line styles respectively, wherein, and the 1st line for the band square frame, the 2nd time is the line of being with stain, the 3rd time is the line of band circle.The long L in cavity chamber becomes big along with the rising of ambient temperature.The fibre optic compression sensor probe exists temperature to crosstalk, and therefore must carry out temperature drift compensation with the optical fiber temperature sensor probe.
Fibre optic temperature sensor probe of the present invention is made of two surfaces 27,28 and the diaphragm itself of diaphragm 24, shown in Fig. 2 C.The light that the optical fiber 8 of fibre optic compression sensor is derived is respectively by two surfaces 27 and 28 reflections of diaphragm, and once more by these optical fiber 8 acceptance, forms two-beam interference in optical fiber 8.The fibre optic temperature sensor probe reflectance spectrum under different temperatures is shown in Fig. 4 A, and dotted line among the figure and solid line are respectively the reflectance spectrum under the temperature of 0 ℃ and 200 ℃.Ambient temperature rises and causes interference fringe to become close.The thickness of diaphragm 24 and refractive index change with the variation of ambient temperature.The long M in equivalent cavity chamber of diaphragm 24 is the product of its thickness h and its refractive index n, and the relation of M and ambient temperature is by formula 4 statements
M＝nh＝n
0[1+α
n(T-T
0)]h
0[1+α
h(T-T
0)] (4)
Wherein M, n, n
0, h, h
0, T, T
0Be equivalent cavity chamber length, current refractive index, initial index of refraction, current diaphragm thickness, initial diaphragm thickness, Current Temperatures, initial temperature, α
n=
N/n
T is a diaphragm material refractive index coefficient of thermal expansion, α
h=
H/h
T is the diaphragm material coefficient of thermal expansion.The variation relation of reflectance spectrum cavity equivalent with it long M in chamber of fibre optic temperature sensor probe is by formula 5 statements.
Wherein λ is a wavelength, and I (λ) is a reflectance spectrum, I
s(λ) be wideband light source spectrum, M is that its equivalent cavity chamber is long, and γ is the interference fringe contrast.Therefore, can calculate the long M in equivalent cavity chamber by reflectance spectrum I (λ) to the fibre optic temperature sensor probe.In the present embodiment, the long M in equivalent cavity chamber of fibre optic temperature sensor probe and the relation of ambient temperature are shown in Fig. 4 B.The result who has shown 5 measurements among the figure, wherein the 1st time is the line of band square frame, the 2nd line for the band cross, the 3rd time is the line of being with triangle, and the 4th is the line of band circle, and the 5th is for being with the line of five-pointed star.Wherein the 1st time, the 3rd time and the 5th are heating curves, and the 2nd time and the 4th are temperature lowering curves.The result shows that the thermometric repeatability of optical fiber temperature sensor probe is better.
Foregoing is illustrating content of the present invention just, the invention is not restricted to above-mentioned disclosed specific embodiment, various modifications in foundation spirit of the present invention that those of ordinary skills carry out the foregoing description and the category change, and all should drop in the scope defined by the claims.
Claims (8)
1. diaphragm-type optical-fiber intelligent well pressure and temperature pick up, it is characterized in that, comprising: wideband light source, modular optical spectrometer, data line, data processor, first section optical fiber, second section optical fiber, fiber coupler, optical cable and one or more diaphragm-type optical-fiber temperature and pressure two parameter sensor probes; Described wideband light source links to each other with the input of fiber coupler by second section optical fiber, an output of this fiber coupler links to each other with optical cable, another output links to each other with the input of modular optical spectrometer by first section optical fiber, and this modular optical spectrometer links to each other with data processor by data line; Described diaphragm-type optical-fiber temperature and pressure two parameter sensor probes are at the other end of optical cable; Described diaphragm-type optical-fiber temperature and pressure two parameter sensor probes are made up of fixator and the light-conductive optic fibre, the diaphragm that are arranged in this fixator, described light-conductive optic fibre end face and diaphragm lay respectively at the both ends of the surface of the cavity in the fixator, and fixator is used for each assembly fixed and forms the sensing head of an integral body; The fibre optic temperature sensor of described diaphragm-type optical-fiber temperature and pressure two parameter sensor probes probe is made of two surfaces and the diaphragm itself of described diaphragm.
2. sensor as claimed in claim 1 is characterized in that, a described above diaphragm-type optical-fiber temperature and pressure two parameter sensor probes are distributed in the optical cable on the same optical fiber.
3. sensor as claimed in claim 1, it is characterized in that, described fixator is served as reasons up and down, and the top cylindrical drum and the lower cylindrical tube of two different-diameters combine, there is a through hole at the fixator center, be used for fixing the light-conductive optic fibre that stretches into wherein, this top cylindrical drum is connected, seals with the oil well optical cable and fix by the outer jointing jacket tube of oil well optical cable; The lower cylindrical tube of fixator has a cavity, and the bottom of fixator has the groove that is used to install diaphragm.
4. sensor as claimed in claim 1, it is characterized in that, the fibre optic compression sensor probe of described diaphragm-type optical-fiber temperature and pressure two parameter sensor probes, be made of the upper surface of the end face of this light-conductive optic fibre, diaphragm on the other side and the fixator cavity between fiber end face and the diaphragm, the degree of depth of this cavity is that the initial cavity of fibre optic compression sensor is long.
5. sensor as claimed in claim 1 is characterized in that, described diaphragm material adopts and contains SiO
2Dielectric material or optical crystal material a kind of.
6. sensor as claimed in claim 5 is characterized in that, one or two surface of described diaphragm is useful on the plated film that improves reflectivity.
7. sensor as claimed in claim 6 is characterized in that, the membrane material of described plated film adopts metal material or oxide material.
8. the sensor described in claim 1 is characterized in that, described first section optical fiber and second section single-mode fiber that the optical fiber adopting quartz glass is made.
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Denomination of invention: Diaphragm-type optical-fiber intelligent well pressure and temperature sensing unit Effective date of registration: 20120608 Granted publication date: 20110302 Pledgee: Zhongguancun Beijing science and technology Company limited by guarantee Pledgor: Beijing Weilanshi Technology Co., Ltd. Registration number: 2012990000276 |
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