PH21548A - Apparatus for demodulating signals in a logging while drilling system - Google Patents

Apparatus for demodulating signals in a logging while drilling system

Info

Publication number
PH21548A
PH21548A PH22227A PH22227A PH21548A PH 21548 A PH21548 A PH 21548A PH 22227 A PH22227 A PH 22227A PH 22227 A PH22227 A PH 22227A PH 21548 A PH21548 A PH 21548A
Authority
PH
Philippines
Prior art keywords
logging
drilling system
demodulating signals
demodulating
signals
Prior art date
Application number
PH22227A
Other languages
English (en)
Inventor
Gene F Schroeder
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
Application filed by Schlumberger Technology Corp filed Critical Schlumberger Technology Corp
Publication of PH21548A publication Critical patent/PH21548A/en

Links

Classifications

    • 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
    • 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
    • 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
    • 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

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)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Networks Using Active Elements (AREA)
PH22227A 1978-02-27 1979-02-22 Apparatus for demodulating signals in a logging while drilling system PH21548A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/881,460 US4185246A (en) 1978-02-27 1978-02-27 Circuit for reducing transients by precharging capacitors

Publications (1)

Publication Number Publication Date
PH21548A true PH21548A (en) 1987-12-11

Family

ID=25378539

Family Applications (1)

Application Number Title Priority Date Filing Date
PH22227A PH21548A (en) 1978-02-27 1979-02-22 Apparatus for demodulating signals in a logging while drilling system

Country Status (4)

Country Link
US (1) US4185246A (es)
CA (2) CA1128187A (es)
MX (1) MX4556E (es)
PH (1) PH21548A (es)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419765A (en) * 1979-10-12 1983-12-06 Keith H. Wycoff Signal absence detector
JPS58501519A (ja) * 1981-09-24 1983-09-08 キヤタピラ−　トラツクタ−　カンパニイ 信号調整回路
US4559505A (en) * 1983-01-04 1985-12-17 Motorola, Inc. Frequency synthesizer with improved priority channel switching
US4590618A (en) * 1984-03-13 1986-05-20 Motorola, Inc. Receiver having reference voltage stabilization circuitry
US4590394A (en) * 1984-03-13 1986-05-20 Motorola, Inc. Signal processing circuit with voltage clamped input
GB2190255B (en) * 1986-04-30 1989-11-29 Philips Electronic Associated Electrical filter
US4866261A (en) * 1987-01-02 1989-09-12 Motorola, Inc. Data limiter having current controlled response time
DE69417296T2 (de) * 1993-06-28 1999-11-04 Csem Centre Suisse D`Electronique Et De Microtechnique S.A. - Recherche Et Developpement, Neuchatel Schaltung zur Verarbeitung von Signalen mit einer Eingangsstufe mit veränderbarer Verstärkung
CA2252241A1 (en) * 1997-11-06 1999-05-06 Harris Simon Method and apparatus for fast recovery from loss of lock in a phase locked loop
US6404578B1 (en) 1999-09-28 2002-06-11 Koninklijke Philips Electronics N.V. Circuit for reduction and optimization of write-to-read settling times in magnetic medium storage devices

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH514251A (de) * 1970-08-21 1971-10-15 Siemens Ag Albis Schaltungsanordnung zum wahlweisen Anschalten wenigstens zweier Eingänge an eine wenigstens einen Vorbereitungs- und einen Auslöseeingang aufweisende Zählstufe
US3725674A (en) * 1971-07-08 1973-04-03 Motorola Inc Impulse noise blanker including broadband level sensing
US3795877A (en) * 1973-04-30 1974-03-05 Gte Sylvania Inc High q notch filter
US4132908A (en) * 1977-08-04 1979-01-02 Smiths Industries, Inc. Digital-to-analog conversion with deglitch

Also Published As

Publication number Publication date
MX4556E (es) 1982-06-10
CA1147840A (en) 1983-06-07
CA1128187A (en) 1982-07-20
US4185246A (en) 1980-01-22

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