• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method, system and apparatus for obtaining a parameter of interest from a plurality of sensors in a fiber optic cable deployed in a wellbore are disclosed. Light having variable frequency within a range of frequencies is propagated along the fiber optic cable. Signals are received that are responsive to interaction of the propagated light with the plurality of sensors. The received signals are filtered using a programrnable filter. The pararneter of interest is obtained from the filtered signals. In one aspect, the fiber optic cable is coupled to a member deployed andl the wellbore and the pararneter of interest is related to the member.
    公开号:DK201300372A
    申请号:DKP201300372
    申请日:2013-06-18
    公开日:2013-06-18
    发明作者:Roger G Duncan；Brooks A Childers
    申请人:Baker Hughes Inc；
    IPC主号:
    专利说明:

    BACICGROUNPOFTHE IMSCLpSIJRE 'L Field, by tfee PlsetoUu «fflOftl} The present disciosyro relates to obtaining a parameter of interest irs. a sweftHvavefetiigÉh iriterievomelry-sysi; eTjoS'Førtesé.iB. ', weH-b0'ros.v ·% Déseripfiéø.of ilse Related Årf | p092; | In vsrioiss aspects of oil exploration and: prødubfioji, optical sensors are deployed downhole and. a light source at a surface location supplies light to the optical sensors over a fiber optic cable. Light interacts because the optical sensors produce a reflected light having a signal, which is measured: to the surface: to be measured. Typically, the returned light is sampled at a sampling; device which is controlled, using a trigger signal .obtained.fei »a.suitable source, such as the light; source. When sampling signals, a sampling frequency is generally selected that prevents false reconsimcfim of the original signal, a process known as aliasing. The highest signal frequency that can be successfully reconstructed for a selected sampling frequency is known as; the. Myquist frequency. Some systems are currently in. use. include anti-aliasing, filters that remove signals above a selected fixed, cut-off frequency of the filter. However, if the signal frequency is changing, as in swepi-wavslcngth systems, such filters may be inadequate. The need for design systems to prevent signal, aliasing introduces factors that.constrain, the utility of the system, or can reduce data, fidelity. The present disclosure therefore provides a method and apparatus for moderating these constraints and / or improving data fidelity in swept-wavelength systems,
    glMMARYmraiPimgsuRE | Blffi3 | lii. one aspect, the present disclosure provides a method of obtaining: a parameter of interest from, a plurality of sensors in a fiber optic cable deployed in a wellbore, the method including; propagating light having variable frequency wifium a range of ftequencies along the fiber optic cable; receiving signals responsive to Interaefidn of the propagated light: with the plurality of sensors ;, filtering; the: received signals using a programmable filter; and obtaining the parameter of xtocrest from the filtered signals.
    [0004] In another aspect, the present disclosure provides apparatus for oMamiftg a parameter of interest from a plurality of sensors. a fiber optic cable deployed in a wellbore, the apparatus including a light source configured to propagate a light having a: variable frequency within a range of frequencies along; the fiber optic: cable; a detector configured to receive signals responsive to interaction of the propagated light with the plurality of sensors; a programmable filter configured to filter the received signals; and a processor configured to obtain the parameter of interest from the filtered signals. f.W '5 | In yet another aspect, the present disclosure provides a system for obtaining a member interest parameter deployed: in a wellbore. The system: Includes a fiber optic cable having a plurality of sensors in it coupled to file nicmbet; alight source configured to propagate a light having a variable frequency within a range of ftequencies along, the fiber optic cable; a detector configured to receive signals responsive to Interaction of the propagated light with the plurality of sensors; a programmable filter configured to filter the received signals; and a preceptor configured to obtain the member's Interest parameter from the filtered signals. piOti] Examples of certain features of the apparatus and method disclosed herein are summarized rather broadly in Older, the dcfailed description thereof that firftows may fee better understood. There are, of course, additional features of the apparatus and method disclosed hereinafter that will form the subject of the claims.
    MIM.MS ^ raoNOFTH
    For detailed understanding of the present disclosure, references should be made to the following detailed description of the exemplary embodiTM-nf taken in conjunction with the accompanying drawings, in which like elements have been given like numerals and where: FIG. 1 shows an exemplary oil production system suitable for use with the exemplary methods, and optical system described herein; FIG. 2 shows a diagram of an exemplary optical-electronic system suitable for use with the exemplary ary oil production system of FIG. ! to obtain a parameter of interest; and .FIG. S shows exemplary frequency spectra of signals obtained from the exemplary optieai.-electrical system, of FIG. 2, PMmÆPBKSCIlI1> TIC> N OF THE IMSCLOSrRF [ØØØSf. FIG. 1 shows an exemplary Oil production system 100 suitable for use with the exemplary methods and optical system described 'herein. The exemplary production system.100 of FIG. I include a tubular 102 in: -wellbore 120 in optical tuning with: Surfece electronics via fiber optic cable 104. Fiber optic cable 104 includes: a plural ity of sensors 10: 6. Each of the plurality of sensors 106 is configured to provide an optical signal upon interaction, with a light propagating In the fiber option. cable 104. The fiber optic cables 104 are wrapped around the sorlaee of the tubular 102 and each of the plurality of sensors 106 is attached at a particular location to tubular 102. A. change in a parameter, such as current temperature, at the particular location is therafor © detected by the sensor attached to or near the particular location, which thus provides a signal cprrespondmg to tho detected change: in parameter. These signals may be processed at surface eleetromes to obtain a parameter such as, for example, a strain: u temperature or: a deformgdon of the tubular. Therefore, the fiber optic cable: may be used, for example, in various; methods suck as: leal Tittle Compaction Monitoring (RTCM), a temperature in the tubular using Distributed Temperature Sensing (jpTS), optical fieguency domain refiectemeiry (QFP &), or any applicable methods using swepdwavckrigth interferometers.
    [00001 Fiber.optic, cable 104 is coupled at fire surface location. to an hitertogatxon unit. 1081 The interrogation unit 108 may include a light source (not shown), typically a tuhahie laser for providing light to the sensors via fiber optic cable 104, and circuitry for obtaining signals from light received from the plurality of sensors 106. Ittförrogaiiou and sounded may be coupled to a data processing unit 110 and in one aspect transmits obtained signals to foe data, processing unit In one aspect, the data processing unit 110 receives: and processes the measured signals' from the interrogation unit 108 to obtain a parameter such as a measurement of wavelength,, strain or temperature: at the Ufonlar. In varfous aspects, data processing; path 110 includes at least One memory 11 »having various programs and data stored therein, a computer or processor ITS accessible to the memory and configured to access one or more of iho programs aod / Or data stored therein to obtain the 'parameter, and a recording medium 117 ibr recording arid storing the obtained parameter. The data processing unit Mil may output the pom-outer to various devices, such as a display 112 or the recording media at 117, f'OttlO] The exemplary production system .100 of FI € T 1 is a sub-spa · oil production system including sensors · .at a. tubular 102 at a sea bottom location 1.25 · in. oosraminiication with surface eteelronles Ci.ea, mterrogation-umt! 0S) located at a sea platform 127 at sea level 126, However, Fie. 1 i-s provided only as an illustration · and not as a lirmtatMrt of the present disclosure. The system may alternatively be deployed at a land location and may induce an oil exploration system, an oil production system, a.mea'surenient-wlnfe-dnilfeg tool or a wireline logging device, among others. In addition, the system may be suitable for use with. any member used in an application. SUBJECT FIG, 2 shows a diagram of an exemplary optical-electronic system. 20® §.outab} e for obtaining a signal related to a parameter of the exemplary system of FIG. 1, The exemplary opeal-dbctrorae system 260 includes alight source 202, a fiber optic cable 206 having one or more sensors. 208 formed therein and various optical: and etetronie devices, referred to herein as surface electronics 212, for obtaining one or more signals related; tp the one or more sensors 2 # S. In. one embodiment, light feom light source 202 is sent to a beam splitter 204 which may split the light info a. first beam of light 23® suitable for obtaining signals from one or more sensors, 208 and a second beam of light 231 for creating a trigger signal. In. an .exemplary embodiment * beam splitter 204 splits the received light so that first beam 230 receives 90% of light and second beam 231 receives 10% of light. However, any splitting ratio may be used, A circulator 214. may be. used to direct the first beam of light: 230, A circulator gsiMpIly includes a p! ofalify of ports circularly ordered for light input and output. The circulator is configured so that light1 enters any port, is trairsmitted to anti exits the next port in rotation- Therefore, light from, the light source 202 propagates info the fiber optic cable 206, The propagated light interacts with, the sensors to produce signals : which are returned to the circulator to be received at detector 218 ·. . | 0i! 21 hi an exemplary embodiment, light source 202. is an ittnable laser light source configured to provide a light having an optical wavelength that sweeps across a range of wavelengths at a selected rate. Use. light source may be any tunable light source or swept wavelength Ilghisouroe which provides a light beam that sweeps across a range of wavelengths, in various aspects ,, the light source may be a continuous light source or a broadband light source. a filter configured in sweep a range of wavelengths, The tange: of wavelengths and a sweep rat © of the Light source, may be pm-programmed or provided by a controller rapping, software or by an operator- Alternatively, the light source can be referred to; as propagating a light having a variable optical fivgiieccy over a range of offrequéacfes. P913 | A typical range of optical wavelengths that may be: swept using the tunable light source may charge from 1550 manometers to 1650 mm at a typical sweep rate of 100 Pm. per second. The range and tuning: rate may be selected by an. operator or a processor sucSt as processor 2311 running a software program, for example.:. For various reasons, the tsMable light source generally does not sweep the selected range in a constant linear manner: but instead-tends'to sweep: the range in an iton-imiforio mom-lhtoar .maimer, the sweep rate may increase as wavelengths get longer or direction of sweep may m & m temporarily.
    [0014). Fiber optic cable 208 includes one or more sensors 208 and: a reference reflector .210, In an exemplary embodiment, the cite or soft sensors 20ft are Fibsr-Bragg Gratings (FBGs) .. An .FBG is a periodic change in lire tefmetive index of the core of an optical fiber and iv typically created, using a laser otoMfig process. An FBG reflects a percentage of incoming light, but only at a specific optical wavelength known as the. Bragg wavelength, which is directly related to a grating period of the FBG. Stress and enulrommetdal factors, such as -thermal changes or mechanical stress, affect the grating: period and thsto & re produce changes with the Bragg wavelength. Thus ,, a measured shift in an optical wavelength of light reflected front an. FBG may be used to detect a change in such etheric cases, ie., Temperature, strain, etc. (0015j Fiber optic -cable 206: is therefore corfogured to propagate light from the circulator 2114 towards reference reflector lift and propagate reflected light towards too circulator. The reflected light ifray is reflected by any of the one or more; sensors 208 or by the reference reflector 218. Reference reflector 218 provides a reference signal which, when combined with light-reflected from a particular sensor of the sensor array, produces an interference pattern which: ratey is used to identify an obtained signal. The interference of toe reference retector signals-wito a sensor signal occurs at a particular optical path: length of the sensor, also known as the spatial frequency of the sensor, 0818] Light reflected from the one or more sensors MS of liber optic cable 208 1 $ sent to -Surface: electronics 212. Exemplary surface electronics 212 includes an optieai-efeefrfeal converter (OBC) 218 that; receives the reflected: light from: the fiber: optical cable 208 via the circulator 214. The OEC 2I8 may be any suitable detector for converting an optical sigimldiito into electrical sigiM, such as a photodetector, or charge-coupled device, for example. . In one embodiment, OEC 2M produces an electrical signal 232 which corresponds to the waveform of the feccineddigM and which may include various signals a! higher frequencies, which may be optical and / or spatial frequencies, These various signals can; considered as isms®, signals. Electrical signal 232 is sent to testable anti-aliasing filler: 224 which filters out the noise signals using the © exemplary methods described herein, Anri-aliasiug til ter 234 is selected to correspond with NyquiM · sampling theory as a sampled signal is folly mermsiructahle when it : ice. less that! 14 of a sampling frequency used to sample the signal signals having a frequency higher than. IT of the sampling frequency reproduces Ms © signals or aliases. .Anti-aliasing 'filter 224 performs, filtering; of signal 232 to remove or reduce signal components above a selected frequency, referred to as, purely as: the cut-off frequency. The multitude of frequencies- present at the: detection system is due to interference between the light reflected at the sensors- and light reflected from the reference reflector. Fitter 224 therefore fit these frequencies ... The cut-off frequency is generally selected at χ / ί of the sampling; rate, loitered signals 236 are then provided to sampler 221 which in one embodiment is analog-to-di: gital converter 1A0C). Sampler 228 receives signal 236 and trigger signal 234, Trigger signal 234 triggers the sampling of signal 23®. Sampler 228 thereby produces a sampled signal typically a digital signal In. aft exemplary emhodimetil the; anti-aliasing: filter can be tuned to remove or reduce signals having spatial fi elds above: the cut-off frequency. It is noted that the: frequency of the electrical signals 232 varies: depending on the frequency of the light: source- The cut-off frequency of anti-aliasing filter 224 also varies with the frequency of the light somce and therefore Is tufted to The received food-free filters 232. Operation of the anti-aliasing filter 224 is discussed below with respect to MG. 3, [1) 017] Gauge molding in reference to FIG,%. the second beam of light 231 is provided to trigger iDtorferometer 220 which provides a trigger signal based on tlte OpticaTwaveLength of the second beam of light 231, In an exemplary embodiment ,, trigger mierferometei '220 produces a trigger signal using a negative-to -positive vero-crossing of a second fringe pattern of the second beam of light 231 such as a transition from a dark region of the fringe pattern to an adjacent iliurnlfiated region of the Ixinge pattern. In an alternate embodiment, trigger signal 244; may be produced from a zero-crossing positi veriomegatlve. Any suitable part of the fringe pattern may be used to produce the trigger signal. In one embodiment QEG .226 may be. used to eoftveri the trigger signal ftfcm M optical signal to. an. electrical trigger sipai 234. solved] Electrical trigger signal 234 is received at smnplef 228 to activate sampling ot filtered signal .2.36 ', Sampler 2ΊΜ samples filtered signal 236 at a rate determined hy ih »electrical trigger sigpai 234 which is therefore related to a variable frequency of light source 2Θ2. | 0019 | In all exemplary embodiment, sampler 228 provides sampled signal. 240 to a. Processor circuits as the data processing unit 110 of FIG. 1, The. exemplary processor may be obiaiu a. parameter from trie sampled signal 240 winch, may be, for example., a; wavelength comspohding for a particular sensor, a wavelength shift at the particular sensor, a. strain at the sensor ,, a. alternatively, the parameter may be determined on any processor including processor .230. f0§: 20] FIG, 3 shows -emftpl & ry frequency spectra of .signals obtained from the exemplary optical system of FIG. 2, Spectrum A. shows an exemplary spectrum at time f of "high * frequency signals and spectrum .B shows an exemplary spectrum at time / exit of "low" frequency signs] ®. Peak '301 represents signals obtained from the; one or more sensors 200 responsive to light at the high frequency range of light source 202; Peak' 31.1 represents signals from one Or more sensors responsive to Eight at a low frequency range of .light, source 202. Sampling: frequency 303 of .Pectrum A is suitable for sampling signal 301. However, wirfous signals in the frequency range 307 of spectrum A, which may be noise signals accompanying Signal 301 for example, produces aliasing effects when sampled using sample, frequency 303. Therefore, filter 303 is applied to spectrum A to reprove signals 307 prior to sampling. Similarly, sampling frequency 30 of Spectrum B. is suitable · for sampling signal 3.11, Spectrum B also induces noise 317 which can produce aliasing effects when sampled: using sample frequency 3D, Therefore, filter 318 is applied to spectrum, B to remove signals. 317 prior to sampling; 'Filter 300 is unsuitable for filtering the sigiiais: of spectri.B, since signals 317 am not removed by application of filter 308. Therefore, the cut-off frequency of the present: disclosure is programmed to be tunable to a frequency of a selected signal. In the embodiment shown In HG. 3, filters 308 and 318are: low-pass filters. Low-pass filter passes signals Whose frequencies are less form a .selected (foot-oif ') frequency, in alternative embodiments ,, the filler may have a band-pass filter centered on the evenq> 1 ary signals 301 arid'311. | W23.J Altemafiy © ly ,, p © dk 301 .roay reproseat sipals obtasfted irom the eight Of more sensars 20S al high apatial frequency rank ©, and peak 311 may represent signals .freon one or; more Sfensois at a low spatial frequency range, in this alternative emhodiPieot, sampling frequencies 303 and 313 sample the spatial frequencies of their respective spectra, ftM122j. Returning to the € fr% a sample rate provided by trigger signal 234 is solved in accordance with variable frequency © f light source 202 In one aspect, the filter 224 is selected by processor 236, the processor may select the cut-off frequency or a type of filter, fe low-pass filter, band-pass filter, etc. Processor 2341 may measure a parameter of the light source 2112, which may be a. frequency of the light source o r sweep rate of light source 202, The processor may select tile filter 224 based on the measured light source parameter. Processor may therefore tune: filter 224. To correspond to the frequency of light source 202, Nominalities ip the .sweep of the light source is also generally refied in the selected cut-off frequency at filter 224. In another aspect, processor 236 may control sweep rate and frequency range of light source 202 and sysehionize filter 224 based on frequency of light source, | 9Q23 | Therefore, in one aspect, the present disclosure provides a method of obtaining a parameter of interest from a plurality of sensors in a fiber optic cable deployed in a wellbore, the method including: propagating light having variable ifequeney within a range of frequencies along : the fiber optic cable; receiving signals responsive to interaction of the propagated light with tire: plurality of sensors; filtering the received signals using a programable filter; arid obtaining the parameter of Interest from the filtered signals. The program © filter may be selected using a processor. The method may further include measuring a parameter of the light selected from the group consisting of (i) q frequency of the propagated light, and (ii) a riming rate of a light source propagating: the fight, and selecting the programmable filter using, the measured light parameter, In one aspect, filtering the receipt by signals fttriher includes; reducing a component of the received signal having a frequency: greater than% of a, sampling rate. The sampling rate may be. related to the variable frequency of the fight source. A band-pass filter and / or a low-pass filter may be selected, for example. The parameter: of interest may be one of: (I) downhole a member; tit): temperature; and (hi) defomiation of the member dmwihoie. i; e various embodiments, tib © fight source is swept across the range of ftequoftcl.es to propagate the light. In another aspect, the petition disclosure provides a device for increasing the interest rate of a fiber optic cable sensor deployed in a home appliance, including a light source configured to propagate a light having a variable frequency within a range. or Ttequeneks. along: the fiber optic cable; a detector configured: to receive signals responsive to interaction of the propagated light with the pterality of sensors; a program number: filter configured to filter the received signals; and a processor eoftfigored to; obtain the parameter of Interest from the filtered signals. The processor may be configured to. select the programmable filter using a parameter of the light selected from the group consisting of; (1) a frequency of the propagated light, sod (If) an inning rate of the light source. The processor may also charge .configured to select the programmable filter to reduce a component of the received signals having a frequency greater than Id of a sampling; rate, Tte sampling; rate is: typically related to the variable frequency of the fight source. The processor may be further configured to select the programmable filter from the. group consisting of a; (i) band-pass: filter and (ii) low-pass filter. The parameter of interest may include: (i) stress fit a member coupled to the fiber optic cable; (Ii) temperatures; and (hi) deformation of a member eoapled to the fiber optic cable. In various embodiments, the light source is further configured: to sweep the range of fieqmmcies. {06251 In yet another aspect, the present disclosure provides a system for obtaining a member interest parameter deployed in a wellbore. The system includes a fiber optic cable having a plurality of sensors coupled to the niembef; a light source configured to propagate a light having a variable frequency within a range © of frequencies along; the fiber optic cable; a detector configured to receive signals responsive to interaction of the propagated light with the purity of sensors; a programmable filter configured to filter the received signals; and a processor configured, to obtain the parameter of interest of the niember from, the filtered signals, The processor may select the programmable filter using: a parameter of the light .selected item the group-consistency: .of: (1) a frequency of the propagated light, and. (| i) a. tuning tm of the fight source. The processor may select the programmable filter to reduce a component of the received signals having a frequency greater than 14 of a sampling rate. The sampling fate is typically related to the variable frequency of the light source. The parameter of Merest of the member may be one of a: fi) stress at the member; (ii) texuperators; and (ill) deformation of the member. f§Q26j While the foregoing disclosure is directed to the pmfen ^ d. egfoodiments of the disclosure, various modifications will appear to those skilled in art. It is intended that all variants within .the scope and spirited foe appended claims · he embraced bp foe foregoing disclosure,
    权利要求:
    Claims (15)
    [1] 1. A merited of obtaining. a garameter of interest: fto.ro a plurality of sensors in a fiber opile cable deployed in a weilbore, comprising; prøpagariwg light having variable ftoqueoey within a range of.frequencies along the fiber optic cable; receiving signals respcmsive to interaction of the propagated Sight with the plurality of sensors: tillering the received signals: using a programmable filter; and obtaining the paratoeter of interest from the filtered signals,
    [2] 2. The method of claim I, further coifiprtsi&g'. Seeing: the programmable filter using a processor.
    [3] 3. The method of claim 1 further comprising measuring a: pararoeter of the light selected from the .group consisting of: (I) a frequency: of the propagated light, and (ii) a tuning rate of a tight source propagating the light, and .selecting, the pragmnsnahle filter using the measured light parameter.
    [4] 4. The method of claim 1, wherein filtering the received signals iffiher comprises leducing acøroponent of the ree©i:ved signal having a frequency greater than % of a sampling rate. 5. lire method of clalxp 4, wherein the sampling rate is related; to the variable frequency, fi. The method of claim 1., wherein selecting ilte programmable filter ferther comprises selecting one of a* (i) bsnd-qmss filter and (ii.) low-pass filter..
    [5] 7. The method of claim 1, wherein the parameter of interest is selected from, a .group, consisting of a: (!) stress at a member' downhole; (it.) temperature; and (Hi) defenuation of the member downhole, S, The method of claim 1 ferther comprising sweeping; the light soiaoe across the mnge of frequencies to propagate the light.
    [6] 9, An apparatus for obtaining a parameter of interest from a plurality of sensors in a fiber optic cable deployed in a wellbore, comprising; a light source configured to. propagate a light having; a variahte frequency within a range of frequenc ies along the fiber optic cable; a detector coirilgured to receive signals responsive to interaction of the Brøpagafed fight with the pluialily of sensors ; a pmgmrantaWe filter eoxifigurefi to fitter the received signals by the detector; and a proeesor configured'to obtain the parameter of interest fh>m tire filtered signals,
    [7] 10, The apparatus of claim 9, wherein. the processor is further configured to sekel tike program make tiller using a parameter: of the light selected from the group, eonsisting of: |i) a ifoqueney of the-propagated light, and. (H) a tuning rate-of the light source, 1L. The apparatus of claim 9, wherein the processor is further 'configured io select the programmable filter to reduce a component of the received, signals having: a ifeqoeney greater than. % of a sampling rate,
    [8] 12, The apparatus of claim 11, wherein the samplingrate is related to the. variable frequency.
    [9] 13, The apparatus of claim 9, wherein the processor is further configured to select the progminrhable filter froth the group consisting of a: (i) hand-pass filter and (ii) low-pass: filler,
    [10] 14, The apparatus: of claim 9,, UffeéiP tht processor Is forti« configured to obtain the parameter of interest selected from a group consisting of a: (I) stress at a member coupled to the fiber optic cable; (ii) temperature;.; tead (iil) åeforøialion of a member coupled to the fiber optic cable.
    [11] 15, The apparatus of claim % wherein the light source, is further configured; to sweep the . range of frequenci es. lb. A system for obiainijig a parameter of interest of a member deployed, in. a wellbore, comprising: a fiber optic cable having .a plurality of sensors therein coupled to the member;, a light source configured,to propagate a light.having, a variable frequency within a range Of frequencies along the liber optic cable; a detector configured to receive signals, responsive to. Interaction of the propagated light with the plurality of sensors; a programmabk filter configured to filter the received signals; and a processor configured to obtain the parameter of Interest of the member from the filtered signals.
    [12] 17. The system Of claim 16, wherein the processor is further configured to seleet the programmable Slier using. a parameter of the light selected from the group consisting of: (i) a frequency of tile: propagated JigM, and (ii) a toning rate of the light source. It. The system of claim 1C wherdB. the processor is mriher configured to select ike programmable biter tb reduce a component of the ré&Pived. signals: having, a .frequency greater than :½ of a sampling rats.
    [13] 19, The system of eiaim IS, wherein the sampling .rate is .related to the variable fiequeney,
    [14] 20, The system of claim, 16, wherein the parameter of interest of the member is ms of a: (:) stress at the member; (il) temperature;, and (Hi) deibimation of the member..
    [15] 21, A method of ohtammg a parameter relating to member hi a wellbore, comprising: placing the member in the wellbore; placing a fiber optic cable having a plurality of sensors on the,member; propagating light having variable irequeney within « range of frequencies along ike fiber optic cable; receiving signals responsive to hiteraetion of the propagated light with, the plurality of sensors; filtering the received signals using a programmable filter; and processing the filtered signals to determine the parameter,
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    同族专利:
    公开号 | 公开日
    CN103299216A|2013-09-11|
    GB201314012D0|2013-09-18|
    BR112013017754A2|2016-10-11|
    BR112013017754B1|2020-12-15|
    CN103299216B|2016-10-19|
    GB2501649A|2013-10-30|
    CA2823245A1|2012-07-26|
    AU2011355676A1|2013-06-20|
    AU2011355676B2|2015-02-12|
    NO345355B1|2020-12-21|
    GB2501649B|2017-02-01|
    DK178150B8|2015-07-27|
    US20120181420A1|2012-07-19|
    DK178150B1|2015-07-06|
    NO20130809A1|2013-06-18|
    WO2012099650A1|2012-07-26|
    GB2501649A8|2016-12-21|
    US8592747B2|2013-11-26|
    CA2823245C|2016-04-12|
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    申请号 | 申请日 | 专利标题
    US201113008979|2011-01-19|
    US13/008,979|US8592747B2|2011-01-19|2011-01-19|Programmable filters for improving data fidelity in swept-wavelength interferometry-based systems|
    PCT/US2011/063866|WO2012099650A1|2011-01-19|2011-12-08|Programmable filters for improving data fidelity in swept-wavelength interferometry-based systems|
    US2011063866|2011-12-08|
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