GB2015307A - Method and apparatus for demodulating signals in a well logging while drilling system - Google Patents

Method and apparatus for demodulating signals in a well logging while drilling system

Info

Publication number
GB2015307A
GB2015307A GB7906841A GB7906841A GB2015307A GB 2015307 A GB2015307 A GB 2015307A GB 7906841 A GB7906841 A GB 7906841A GB 7906841 A GB7906841 A GB 7906841A GB 2015307 A GB2015307 A GB 2015307A
Authority
GB
United Kingdom
Prior art keywords
carrier
frequency
filter
signal
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB7906841A
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.)
Schlumberger Technology Corp
Original Assignee
Schlumberger Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US05/881,459 external-priority patent/US4215425A/en
Priority claimed from US05/881,461 external-priority patent/US4215427A/en
Priority claimed from US05/881,460 external-priority patent/US4185246A/en
Application filed by Schlumberger Technology Corp filed Critical Schlumberger Technology Corp
Publication of GB2015307A publication Critical patent/GB2015307A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • E21B47/14—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 using acoustic waves
    • E21B47/18—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 using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • E21B47/20—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 using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry by modulation of mud waves, e.g. by continuous modulation
    • 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
    • E21B47/14—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 using acoustic waves
    • E21B47/18—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 using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/101—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth
    • H03L7/1075—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geophysics (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

In apparatus for obtaining sub- surface measurements during drilling in a fluid-filled borehole digital data representative of downhole measurements are PSK modulated by momentarily unidirectionally changing the frequency of an acoustic carrier signal. An uphole receiving subsystem converts the modulated acoustic carrier waves to electronic signals and includes a bandpass filter (110) which has its centre frequency offset from the nominal carrier frequency in the direction of the unidirectional frequency change applied during modulation, and which may be skewed in the same direction as the offset. The output signal from the filter (110) is coupled to a phase-locked loop (120) which locks onto the carrier of the received signal, and provides timing signals for the demodulation. The phase-locked loop (120) includes a variable bandwidth filter (300), and a controller (205A) to change the bandwidth of the filter (300) as a function of the input signal. The signal applied to the control terminal of the VCO (204) of the loop is compensated as a function of transitions in the received signal to account for the difference, arising from the unidirectional nature of the carrier modulation, between the nominal frequency of the carrier and the average frequency of the received signal. Capacitors in the variable filter (300) are precharged to appropriate voltages to prevent loss of phase- lock during switching between different loopwidths. <IMAGE>
GB7906841A 1978-02-27 1979-02-27 Method and apparatus for demodulating signals in a well logging while drilling system Withdrawn GB2015307A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US05/881,459 US4215425A (en) 1978-02-27 1978-02-27 Apparatus and method for filtering signals in a logging-while-drilling system
US05/881,461 US4215427A (en) 1978-02-27 1978-02-27 Carrier tracking apparatus and method for a logging-while-drilling system
US05/881,460 US4185246A (en) 1978-02-27 1978-02-27 Circuit for reducing transients by precharging capacitors

Publications (1)

Publication Number Publication Date
GB2015307A true GB2015307A (en) 1979-09-05

Family

ID=27420508

Family Applications (3)

Application Number Title Priority Date Filing Date
GB8115019A Expired GB2094578B (en) 1978-02-27 1979-02-27 Method and apparatus for reducing capacitor-switching transient signals
GB7906841A Withdrawn GB2015307A (en) 1978-02-27 1979-02-27 Method and apparatus for demodulating signals in a well logging while drilling system
GB8115020A Expired GB2087177B (en) 1978-02-27 1979-02-27 Method and apparatus for stabilizing a carrier tracking loop

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB8115019A Expired GB2094578B (en) 1978-02-27 1979-02-27 Method and apparatus for reducing capacitor-switching transient signals

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB8115020A Expired GB2087177B (en) 1978-02-27 1979-02-27 Method and apparatus for stabilizing a carrier tracking loop

Country Status (13)

Country Link
AU (3) AU524811B2 (en)
BR (1) BR7901224A (en)
DE (1) DE2907085A1 (en)
FR (2) FR2434522A1 (en)
GB (3) GB2094578B (en)
GR (1) GR66583B (en)
IE (1) IE48319B1 (en)
IN (1) IN153402B (en)
IT (1) IT1111989B (en)
NL (1) NL191549C (en)
NO (1) NO790496L (en)
OA (1) OA06193A (en)
PH (1) PH18212A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679681A1 (en) * 1991-06-14 1993-01-29 Baker Hughes Inc ACOUSTIC COMMUNICATION TRANSDUCER FOR PROBE HOLE.
EP0584998A2 (en) * 1992-08-12 1994-03-02 Halliburton Company Method and device for detecting pressure pulses
GB2347286A (en) * 1999-02-26 2000-08-30 Motorola Ltd Frequency tracking loop and method of frequency tracking
EP1053488A1 (en) * 1998-01-27 2000-11-22 Halliburton Energy Services, Inc. Multiple transducer mwd surface signal processing
CN106761711A (en) * 2016-12-26 2017-05-31 中石化江汉石油工程有限公司 A kind of downhole instrument multifunctional communication control system
RU2722968C1 (en) * 2019-08-22 2020-06-05 Акционерное общество "Всероссийский научно-исследовательский институт "Градиент" Acoustic active aerial objects detection device

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1206089A (en) * 1982-06-10 1986-06-17 Gary D. Berkenkamp Method and apparatus for signal recovery in a logging while drilling system
US4514706A (en) * 1982-09-24 1985-04-30 Rockwell International Corporation Second or higher order PLL with increased low and medium frequency gain
GB2168879A (en) * 1984-11-19 1986-06-25 Technophone Ltd Differential phase shift keying detector
US4885553A (en) * 1988-11-30 1989-12-05 Motorola, Inc. Continuously adaptive phase locked loop synthesizer
JP2798142B2 (en) * 1990-06-15 1998-09-17 三菱電機株式会社 Frequency synthesizer
DE4102800A1 (en) * 1991-01-31 1992-08-06 Thomson Brandt Gmbh Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc
US8286257B2 (en) 2008-06-02 2012-10-09 Schlumberger Technology Corporation Enabling synchronous and asynchronous collaboration for software applications
US8302685B2 (en) 2009-01-30 2012-11-06 Schlumberger Technology Corporation Mud pulse telemetry data modulation technique
CN106154311A (en) * 2016-08-25 2016-11-23 中国电建集团贵阳勘测设计研究院有限公司 Uphole single pore sound wave test device in one

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916307A (en) * 1974-02-14 1975-10-28 Hekimian Laboratories Inc Time jitter meter
GB1485663A (en) * 1975-03-19 1977-09-14 Mobil Oil Corp Details of an uphole receiver for a logging-while-drilling system
US4007429A (en) * 1976-01-19 1977-02-08 Gte International Incorporated Phase-locked loop having a switched lowpass filter

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5283768A (en) * 1991-06-14 1994-02-01 Baker Hughes Incorporated Borehole liquid acoustic wave transducer
US5592438A (en) * 1991-06-14 1997-01-07 Baker Hughes Incorporated Method and apparatus for communicating data in a wellbore and for detecting the influx of gas
US5850369A (en) * 1991-06-14 1998-12-15 Baker Hughes Incorporated Method and apparatus for communicating data in a wellbore and for detecting the influx of gas
FR2679681A1 (en) * 1991-06-14 1993-01-29 Baker Hughes Inc ACOUSTIC COMMUNICATION TRANSDUCER FOR PROBE HOLE.
US6208586B1 (en) 1991-06-14 2001-03-27 Baker Hughes Incorporated Method and apparatus for communicating data in a wellbore and for detecting the influx of gas
EP0584998A2 (en) * 1992-08-12 1994-03-02 Halliburton Company Method and device for detecting pressure pulses
EP0584998A3 (en) * 1992-08-12 1995-03-01 Halliburton Logging Services Method and device for detecting pressure pulses.
EP1053488A4 (en) * 1998-01-27 2001-09-26 Halliburton Energy Serv Inc Multiple transducer mwd surface signal processing
EP1053488A1 (en) * 1998-01-27 2000-11-22 Halliburton Energy Services, Inc. Multiple transducer mwd surface signal processing
GB2347286A (en) * 1999-02-26 2000-08-30 Motorola Ltd Frequency tracking loop and method of frequency tracking
GB2347286B (en) * 1999-02-26 2001-04-18 Motorola Ltd Frequency tracking loop and method of frequency tracking
AU763428B2 (en) * 1999-02-26 2003-07-24 Motorola Limited Frequency tracking loop and method of frequency tracking
CN106761711A (en) * 2016-12-26 2017-05-31 中石化江汉石油工程有限公司 A kind of downhole instrument multifunctional communication control system
CN106761711B (en) * 2016-12-26 2024-02-02 中石化江汉石油工程有限公司 Multifunctional communication control system for downhole instrument
RU2722968C1 (en) * 2019-08-22 2020-06-05 Акционерное общество "Всероссийский научно-исследовательский институт "Градиент" Acoustic active aerial objects detection device

Also Published As

Publication number Publication date
FR2434522A1 (en) 1980-03-21
IN153402B (en) 1984-07-14
GB2087177B (en) 1983-02-02
FR2433860B1 (en) 1984-02-24
FR2433860A1 (en) 1980-03-14
IE790561L (en) 1979-08-27
IT7920429A0 (en) 1979-02-22
NL191549B (en) 1995-05-01
BR7901224A (en) 1979-10-02
NL7901534A (en) 1979-08-29
AU8567282A (en) 1982-11-04
IT1111989B (en) 1986-01-13
AU4462179A (en) 1979-10-18
AU8567382A (en) 1982-12-23
NO790496L (en) 1979-08-28
GR66583B (en) 1981-03-27
GB2087177A (en) 1982-05-19
OA06193A (en) 1981-06-30
NL191549C (en) 1995-09-04
GB2094578A (en) 1982-09-15
PH18212A (en) 1985-04-30
IE48319B1 (en) 1984-12-12
AU524811B2 (en) 1982-10-07
GB2094578B (en) 1983-06-08
DE2907085A1 (en) 1979-10-25

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960227