EP2638244B1 - System and method for remote sensing - Google Patents

System and method for remote sensing Download PDF

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Publication number
EP2638244B1
EP2638244B1 EP11806009.4A EP11806009A EP2638244B1 EP 2638244 B1 EP2638244 B1 EP 2638244B1 EP 11806009 A EP11806009 A EP 11806009A EP 2638244 B1 EP2638244 B1 EP 2638244B1
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EP
European Patent Office
Prior art keywords
power
signal
conductive line
downhole
sensor
Prior art date
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Active
Application number
EP11806009.4A
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German (de)
English (en)
French (fr)
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EP2638244A2 (en
Inventor
Manuel E. Gonzalez
M. Clark Thompson
Robert L. Williford
David W. Beck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chevron USA Inc
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Chevron USA Inc
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Publication of EP2638244A2 publication Critical patent/EP2638244A2/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency

Definitions

  • the present invention relates generally to remote sensing and more particularly to sensing pressures and temperatures in a down hole environment.
  • the present disclosure extends to tangible computer readable media encoded with computer executable instructions for performing any of the foregoing methods and/or for controlling any of the foregoing apparatuses or systems.
  • FIG. 1 illustrates an example of an apparatus 100 for monitoring a condition in a subsurface borehole.
  • the apparatus 100 includes an electromagnetically transmissive medium, such as a conductive line 102, for conducting electromagnetic energy through the borehole.
  • a conductive line 102 may take different forms or embodiments, depending on the state of the borehole.
  • the conductive line 102 may comprise a production tubing string in a completed borehole or a drillstring in a borehole under construction.
  • a transformer 104 is provided to couple the conductive pipe to a source of electromagnetic energy. Alternate coupling methods to the transformer 104 may be employed.
  • the transmission line may directly couple to a coaxial cable or any other suitable cable.
  • the transformer 104 includes a stack of ferrite rings 106, and a wire 108 wound around the rings.
  • the wire 108 includes leads 110 that may be coupled to a signal generator 112 which may be configured to produce a pulsed or a continuous wave signal, as necessary or desirable.
  • the wire 108 may further be coupled to a receiver 114.
  • the receiver 114 may be embodied as a computer that includes a bus for receiving signals from the apparatus 100 for storage, processing and/or display.
  • the computer 114 may be provided with a display 118 which may include, for example, a graphical user interface.
  • the computer 114 may be programmed to process the received sensor signals to provide a measure of the sensed characteristic.
  • the computer 114 may perform any desired processing of the detected signal including, but not limited to, a statistical (e.g., Fourier) analysis of the signal, a deconvolution of the signal, a correlation with another signal or the like.
  • a statistical (e.g., Fourier) analysis of the signal e.g., a deconvolution of the signal, a correlation with another signal or the like.
  • Commercial products are readily available and known to those skilled in the art that can be used to perform any suitable frequency detection.
  • the computer may be provided with a look-up table in memory or in accessible storage, that correlates received modulated signals to sensed conditions in the borehole.
  • the borehole will be lined with a borehole casing 120 which is used to provide structural support to the borehole.
  • This casing 120 is frequently made from a conductive material such as steel, in which case it will cooperate with the line 102 in order to form a coaxial transmission line, and it is not necessary to provide any additional conductive medium.
  • a conductive sleeve (not shown) may be provided within the casing in order to form the coaxial structure.
  • the apparatus 100 may include dielectric rings 122 disposed periodically along the conductive line 102.
  • the spacers can, for example, be configured as insulated centralizers which can be disks formed from any suitable material including, but not limited to, nylon or polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the illustrated embodiment makes use of a coaxial transmission line, it is contemplated that alternate embodiments of a transmission line may be employed, such as a single conductive line, paired conductive lines, or a waveguide.
  • the casing alone may act as a waveguide for certain frequencies of electromagnetic waves.
  • lengths of coaxial cable may be used in all or part of the line. Such coaxial cable may be particularly useful when dielectric fluid cannot be used within the casing 120 (e.g., when saline water or other conductive fluid is present in the casing 120).
  • a probe portion 124 is located near the distal end of the apparatus 100.
  • the probe portion may be located at any point along the length of the transmission line. Indeed, multiple such probe portions may be placed at intervals along the length.
  • wavelength multiplexing on the coaxial line could be used to allow for multiple probes to use a single communication line without interfering with each other.
  • the probe portion may include a port 126 that is configured to communicate ambient pressures and/or temperatures from fluid present in the borehole into the probe where it may be sensed by the sensor (not shown in Figure 1 ). Below the probe is illustrated a packer 128 and packer teeth 130.
  • Figure 2 is an electrical schematic illustrating a down hole portion of an embodiment of the system in accordance with the invention.
  • An RC terminator 200 is intended to reduce or eliminate reflections at the line end. From the line end, the path of the power signal depends on whether it is a DC or an AC signal. Applied DC will take the upper path 202 through the high inductance inductor 204 (which may be, for example, about 1mH) and pass through diode 206, arriving at the DC power out 208 at the right of the Figure. On the other hand, applied AC will pass through the relatively lower inductance inductor 212 (which may be, for example, about 17 ⁇ H).
  • the AC energy passes through a power transformer 214 and a bridge rectifier 216 to produce DC power at the same DC power out portion of the circuit 208.
  • the sensors produce a signal (generally an RF signal) that is accepted at the RF sensor input portion of the circuit 218 and coupled back to the conductive pair for transmission to the surface.
  • a passive power switching method and apparatus allows selective application of power to down hole circuits and loads.
  • an isolator may be nothing more than a dielectric break in an otherwise solid piece of tubing.
  • such an isolator needs to fit within well casings with sufficient clearance, exhibit low end-to-end capacitance, be able to standoff many hundreds of volts of applied potential, and perhaps most importantly, be received by wellsite managers with confidence that it will not fail.
  • Built-in failsafe design features may also be useful, or required for acceptance by users.
  • a technique for DC isolation includes a ceramic or other non-conductive insulator inserted in series with well tubing. This may be, for example, built-in to a 1.22 m (4 foot) section of tubing, commonly referred to as a "sub".
  • the ceramic and tubing parts may be clamped together and should be connected without electrically shorting the tubing parts together.
  • An insulating coating may be applied to the internal and external surfaces of the assembly as electrical breakdown protection across the gap.
  • the RF (sensor signal) and DC (power) connection is made to the tubing thru a common connection, with signal separation handled electronically outside the well.
  • FIG. 3 An example of a set-up in accordance with an embodiment of the invention is schematically illustrated in Figure 3 .
  • the power signal generated at the surface is an AC signal delivered to input 300.
  • the AC signal is coupled into the conductor pair via power cores 302 which may be of the ferrite transformer type described above in relation to Figure 1 .
  • Figure 4 illustrates an alternate approach in which the power signal is a DC signal.
  • a primary difference is the use of a transformer which may be, for example, a toroidal transformer made with tape wound cores on the wellstring tubing just below the wellhead and above a set of RF ferrite cores 304.
  • a transformer which may be, for example, a toroidal transformer made with tape wound cores on the wellstring tubing just below the wellhead and above a set of RF ferrite cores 304.
  • a small number of turns make up the primary of the transformer, with the well tubing making up the secondary winding of the transformer.
  • it may be a single turn secondary winding.
  • the sensor module 310 and bowspring centralizer 312 used in the DC isolator approach remains unchanged in such an AC application.
  • the power signals generated by power supply 318 are provided to the sensor module 310 from the lower transformer 304.
  • the sensor module 310 generates communication signals that are transmitted to the lower transformer 304.
  • the communication signals are conducted up the tubing string to the upper transformer 302 and then transmitted to the receiver 320 of the surface system 500 (as illustrated in Figure 5 ).
  • the electrical path is completed by grounding the tubing string on unused sides of the upper and lower transformers and by grounding the surface system and sensor module 310.
  • the casing is generally grounded.
  • the tubing string above the upper transformer may be grounded by coupling the tubing string to the casing through the wellhead.
  • the tubing string below the lower transformer 304 may be grounded by connecting the tubing string to the casing via the bowspring centralizer 312, for example.
  • the transformers are formed by formed by using the tubing string as one of the windings of each transformer.
  • the power signal from the surface system is transmitted to the primary winding of a toroidal transformer positioned around the tubing string.
  • the tubing string itself is the single turn secondary winding of the transformer for the power circuit.
  • the lower transformer is another toroidal transformer surrounding the tubing string and includes, for the power circuit, a primary winding that is the tubing string itself and a secondary winding that is connected to the sensor module 310.
  • signals are transmitted using the same transformers, though (as compared to the power circuit) the roles of the primary and secondary windings in each transformer are reversed.
  • the technique for AC isolation includes an isolator built-up on a short section of steel tubing, incorporating AC and RF magnetics. Separate AC and RF electrical connections (300, 314 respectively) may be made through a wellhead hanger 316. A suitable impedance for the RF signal may be established by selection of the RF magnetic material. A suitable impedance for the AC source may be established by selection of the AC transformer characteristics.
  • the RF impedance, established by the RF magnetics is also affected by the presence of the AC magnetics, which represent a very high impedance to the RF. As such, it may be necessary to provide an electrical path around the AC magnetics to the wellhead for the RF currents travelling up the wellstring from the sensor package 310. In that case, two different electrical connections to the wellhead would be required.
  • the power frequencies may be between 5kHz and 200kHz, for example.
  • the RF frequencies for data may be between 3MHz and 8 MHz.
  • power is supplied in a range between 1 and 10kHz and data is transmitted using a frequency-shift keying modulation scheme at frequencies in the range between 15 and 30kHz.
  • Power frequencies above the RF range are, in theory, usable.
  • Sensor data frequencies may also be selected outside the foregoing ranges. Because the transmission frequencies of the power and sensor signals are different, it is possible to separate them using filtering at either the surface system 500 and/or at the sensor module 310.
  • FIG. 6 is a block diagram of a sensor module 600 assembly in accordance with an embodiment of the present invention. As will be appreciated the sensor module 600 is similar to the arrangement illustrated in Figure 2 and represents an alternate approach to illustrating similar concepts.
  • the sensor module 600 connects to the lower transformer by way of a bus 602 that carries both the power signal and the sensor data signal.
  • a low pass filter 604 passes the low frequency power signal to the sensor module power circuitry which is made up of a transformer 606, a rectifier 608, and a voltage regulator 610.
  • Power is supplied to a microprocessor 612 and to one or more digital gauges 614, each of which may be, for example, a Quartzdyne® gauge, available from Quartzdyne, Inc. of Salt Lake City, UT.
  • Such gauges constitute a quartz resonator and are often packaged along with an accompanying oscillator circuit and processor (e.g., frequency counter), and may include reference and temperature crystals along with their respective oscillator circuitry.
  • Output from the gauges 614 is provided to the processor 612 which processes the data and outputs a communication signal through a frequency modulator 616.
  • the communication signal is passed back to the tubing string by way of the bus 602 and the lower transformer.
  • a high pass filter 618 (which may be a capacitor), in conjunction with the low pass filter 604, isolates the communication signal from the power pathway.
  • a bus 702 communicates with the upper transformer 302.
  • a serial input 704 obtains power from a power supply, not shown.
  • An MPU 706 manages the input power and outputs the power by way of a low pass filter 708, digital attenuator 710, and power amplifier 712.
  • a power monitor 714 senses the output power and returns data on the sensed power to the MPU 706.
  • a second low pass filter 716 which in the illustrated embodiment is an inductor, passes the power signal to the bus 702 and excludes the higher frequency data signals that are being returned from the sensor module. The data signals instead pass through a high pass filter 718 to a demodulator 720 and thence to the MPU 706.
  • Output from the MPU may be passed via an Ethernet connection 722, or other type of connection.
  • FIG 8 is a block diagram illustrating an arrangement similar to that illustrated in Figure 4 and represents an alternate approach to illustrating similar concepts. As described above, this approach makes use of ceramic insulated tubing subs in order to isolate a portion of the tubing.
  • One insulating sub forms the upper isolator 319 while another forms the lower isolator 321.
  • An intermediate tubing portion 802 becomes the transmission line for signals and power in the system.
  • the tubing string conducts power signals from a connection point located just below the upper ceramic insulated tubing sub (upper insulator 319) to a connection point located just above the lower ceramic insulated tubing sub (lower insulator 321).
  • the power signals are provided to a sensor module/gauge assembly 310 from the connection point located just above the lower insulator 321.
  • the sensor module 310 In the reverse direction, the sensor module 310 generates communication signals that are transmitted to the connection point located just above the lower insulator 321.
  • the communication signals are conducted up the tubing string to the connection point located just below the upper insulator 319 and then transmitted to the surface system 500..
  • the electrical path is completed by grounding the tubing string above the upper ceramic insulated tubing sub and below the lower ceramic insulated tubing sub and by grounding the surface system and sensor module.
  • the casing In practice, the casing is generally grounded.
  • the tubing string above the upper ceramic insulated tubing sub may be grounded by coupling the tubing string to the casing through the wellhead.
  • the tubing string below the lower ceramic insulated tubing sub may be grounded by connecting the tubing string to the casing via a bowspring shorting centralizer, for example.
  • the inventors arranged up to 5,182 m (17,000') of coaxial cable that matched the losses of a field test (i.e., simulated the depth of a typical deep well).
  • a remote full-wave AC power rectifier/filter was provided at the end of the cable to provide DC power to amplify the sensor signal.
  • a low frequency 60 hertz AC voltage was transmitted down the cable. It provided about 10 volts DC (out of the rectifier/filter) at the cable terminus.
  • An amplified sensor signal (frequency peak) was received at the surface using an HF radio detector. This setup allowed receipt of over 120 readings per second at the surface.
  • parameters such as pressure or temperature are measured (singularly or simultaneously) at great depth using the well string hardware as both the path to power the sensors (and other associated devices), and to transport data signals from the sensors.
  • this technique uses the same conduction system for both electrical power and the signal path for the parameter data.
  • Applied power can be DC and/or AC power at various frequencies to accommodate a multitude of lower powered remote functions or higher powered uses including artificial lifting systems (pumps).
  • This technique uses the well tubing and casing as a conductive pair (CP) to carry the power down to the remote, powered sensor set or associated devices.
  • CP conductive pair
  • the tubing is maintained on center of the well-casing with annular insulator spacers ("centralizers") such that the conductive pair (tubing and casing) do not electrically short to each other.
  • centralizers annular insulator spacers
  • this same conductor pair can perform as the path to the wellhead for processing of the data from the sensor set.
  • Those familiar with the art will understand selective frequency filtering methods used here to separate power from signal and function from function.
  • This process uses sensors that translate the parameter of interest to a low power Radio Frequency (RF) transmitter.
  • RF Radio Frequency
  • the carrier of each transmitter is modulated to provide the imbedded data to surface level instrumentation.
  • the RF carrier is then demodulated at the surface electronics for use.
  • a second use of the CP arrangement of the well hardware described herein is to power an electrical submersible pump (ESP) system for artificial lifting of fluids in the producing zones.
  • Electrical power sent to the ESP, via the tubing string, can be used to power attached sensor systems with the signals from those sensors using the same CP as the RF path back to surface instruments.
  • methods for commanding various functions down-hole might be accomplished by selecting a specific power frequency that would perform various separate remote operations (i.e. multiple zone valve control, etc.) by using resonant, frequency selective networks at the remote valve location.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Electromagnetism (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP11806009.4A 2010-11-12 2011-11-11 System and method for remote sensing Active EP2638244B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41317910P 2010-11-12 2010-11-12
PCT/US2011/060454 WO2012065118A2 (en) 2010-11-12 2011-11-11 System and method for remote sensing

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Publication Number Publication Date
EP2638244A2 EP2638244A2 (en) 2013-09-18
EP2638244B1 true EP2638244B1 (en) 2020-03-25

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US (1) US20120211278A1 (zh)
EP (1) EP2638244B1 (zh)
CN (1) CN103221635A (zh)
AU (1) AU2011325931B2 (zh)
BR (1) BR112013011709B1 (zh)
CA (1) CA2817593C (zh)
EA (1) EA025452B1 (zh)
MX (1) MX2013005021A (zh)
WO (1) WO2012065118A2 (zh)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9103198B2 (en) * 2010-11-12 2015-08-11 Chevron U.S.A. Inc. System and method for remote sensing
US9506340B2 (en) * 2013-03-14 2016-11-29 Sercel-Grc Corporation Downhole quartz gauge with minimal electronics
US10240456B2 (en) * 2013-03-15 2019-03-26 Merlin Technology, Inc. Inground device with advanced transmit power control and associated methods
US9425619B2 (en) 2013-03-15 2016-08-23 Merlin Technology, Inc. Advanced inground device power control and associated methods
US9828848B2 (en) * 2014-10-09 2017-11-28 Baker Hughes, A Ge Company, Llc Wireless passive pressure sensor for downhole annulus monitoring
DE102014224749B3 (de) * 2014-12-03 2016-01-14 Heidelberger Druckmaschinen Ag Intellectual Property Temperaturerfassung im Stecker mittels überlagerter Prüffrequenz
US9708905B2 (en) * 2015-06-05 2017-07-18 Sensor Developments As Wellbore wireless thermal conductivity quartz transducer with waste-heat management system
CN107503743B (zh) * 2017-08-15 2020-06-09 马鞍山鹏远电子科技有限公司 一种精确且可伸缩的井下定位装置
EA037631B1 (ru) * 2020-07-14 2021-04-23 ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ "Тота Системс" Способ определения физических величин в скважине на основе пьезорезонансных датчиков без электроники и устройство для его осуществления
BR102020026546A2 (pt) * 2020-12-23 2022-07-05 Halliburton Energy Services, Inc. Método, e, aparelho
US11994023B2 (en) 2021-06-22 2024-05-28 Merlin Technology, Inc. Sonde with advanced battery power conservation and associated methods

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008133633A1 (en) * 2007-04-28 2008-11-06 Halliburton Energy Services, Inc. Wireless telemetry repeater systems and methods

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308499A (en) * 1978-05-26 1981-12-29 Kali Und Salz A.G. Method utilizing electromagnetic wave pulses for determining the locations of boundary surfaces of underground mineral deposits
US5751895A (en) * 1996-02-13 1998-05-12 Eor International, Inc. Selective excitation of heating electrodes for oil wells
DE69921722T2 (de) * 1998-04-15 2005-04-07 Halliburton Energy Services, Inc., Duncan Werkzeug und Verfahren zur Erkundung und zum Testen geologischer Formationen
US6633236B2 (en) * 2000-01-24 2003-10-14 Shell Oil Company Permanent downhole, wireless, two-way telemetry backbone using redundant repeaters
US6891481B2 (en) * 2000-10-02 2005-05-10 Baker Hughes Incorporated Resonant acoustic transmitter apparatus and method for signal transmission
US6434372B1 (en) * 2001-01-12 2002-08-13 The Regents Of The University Of California Long-range, full-duplex, modulated-reflector cell phone for voice/data transmission
US6795373B1 (en) * 2003-02-14 2004-09-21 Baker Hughes Incorporated Permanent downhole resonant source
US7158049B2 (en) * 2003-03-24 2007-01-02 Schlumberger Technology Corporation Wireless communication circuit
US8077053B2 (en) * 2006-03-31 2011-12-13 Chevron U.S.A. Inc. Method and apparatus for sensing a borehole characteristic
US8390471B2 (en) * 2006-09-08 2013-03-05 Chevron U.S.A., Inc. Telemetry apparatus and method for monitoring a borehole
US8106791B2 (en) * 2007-04-13 2012-01-31 Chevron U.S.A. Inc. System and method for receiving and decoding electromagnetic transmissions within a well
US7636052B2 (en) * 2007-12-21 2009-12-22 Chevron U.S.A. Inc. Apparatus and method for monitoring acoustic energy in a borehole
WO2009032899A2 (en) * 2007-09-04 2009-03-12 Chevron U.S.A. Inc. Downhole sensor interrogation employing coaxial cable

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008133633A1 (en) * 2007-04-28 2008-11-06 Halliburton Energy Services, Inc. Wireless telemetry repeater systems and methods

Also Published As

Publication number Publication date
CN103221635A (zh) 2013-07-24
EA025452B1 (ru) 2016-12-30
EP2638244A2 (en) 2013-09-18
AU2011325931B2 (en) 2015-12-10
WO2012065118A3 (en) 2013-03-07
AU2011325931A1 (en) 2013-05-02
CA2817593C (en) 2018-09-18
BR112013011709B1 (pt) 2020-10-06
MX2013005021A (es) 2013-06-03
WO2012065118A2 (en) 2012-05-18
CA2817593A1 (en) 2012-05-18
EA201390692A1 (ru) 2014-03-31
BR112013011709A2 (pt) 2017-07-25
US20120211278A1 (en) 2012-08-23

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