GB0708247D0 - Downhole telemetry system using discrete multi-tone modulation in a wireless communication medium - Google Patents

Downhole telemetry system using discrete multi-tone modulation in a wireless communication medium

Info

Publication number
GB0708247D0
GB0708247D0 GBGB0708247.2A GB0708247A GB0708247D0 GB 0708247 D0 GB0708247 D0 GB 0708247D0 GB 0708247 A GB0708247 A GB 0708247A GB 0708247 D0 GB0708247 D0 GB 0708247D0
Authority
GB
United Kingdom
Prior art keywords
downhole
telemetry system
wireless communication
communication medium
communications
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.)
Granted
Application number
GBGB0708247.2A
Other versions
GB2434682A (en
GB2434682B (en
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.)
Halliburton Energy Services Inc
Original Assignee
Halliburton Energy Services Inc
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 US10/364,169 external-priority patent/US20040156264A1/en
Application filed by Halliburton Energy Services Inc filed Critical Halliburton Energy Services Inc
Publication of GB0708247D0 publication Critical patent/GB0708247D0/en
Publication of GB2434682A publication Critical patent/GB2434682A/en
Application granted granted Critical
Publication of GB2434682B publication Critical patent/GB2434682B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
    • G01V3/30—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electromagnetic waves
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/206—Arrangements for detecting or preventing errors in the information received using signal quality detector for modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems

Abstract

A downhole telemetry system for transmitting electromagnetic signals wirelessly in a bore hole comprises a surface modem (230) coupled to an antenna and a downhole modem (220) coupled to an antenna (201). The modems (220, 230) communicate using discrete multitone (DMT) modulation over a first set of frequency subchannels for uplink communications to a surface computer (234) where the telemetry data may be processed. Bidirectional communication may be implemented, whereby downlink communications are effected over a second set of frequency subchannels. The number of bits transmitted over a frequency subchannel is determined in a configuration process and may be determined dynamically so as to optimise the communications for the downhole conditions, improving telemetry data rate and reliability.
GB0708247A 2003-02-10 2007-04-27 Downhole telemetry system using discrete multi-tone modulation in a wireless communication medium Expired - Lifetime GB2434682B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/364,169 US20040156264A1 (en) 2003-02-10 2003-02-10 Downhole telemetry system using discrete multi-tone modulation in a wireless communication medium
GB0518240A GB2414324B (en) 2003-02-10 2004-02-09 Downhole telemetry system using discrete multi-tone modulation in a wireless communication medium

Publications (3)

Publication Number Publication Date
GB0708247D0 true GB0708247D0 (en) 2007-06-06
GB2434682A GB2434682A (en) 2007-08-01
GB2434682B GB2434682B (en) 2007-10-10

Family

ID=38234881

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0708247A Expired - Lifetime GB2434682B (en) 2003-02-10 2007-04-27 Downhole telemetry system using discrete multi-tone modulation in a wireless communication medium

Country Status (1)

Country Link
GB (1) GB2434682B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2236744A3 (en) * 2009-03-30 2013-09-18 Services Pétroliers Schlumberger Digital signal processing recievers, systems and methods for identifying decoded signals
WO2014153657A1 (en) * 2013-03-28 2014-10-02 Evolution Engineering Inc. Electromagnetic communications system and method for a drilling operation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6429784B1 (en) * 1999-02-19 2002-08-06 Dresser Industries, Inc. Casing mounted sensors, actuators and generators
WO2002103944A1 (en) * 2001-06-19 2002-12-27 Baker Hughes Incorporated Full duplex dmt modulation in well-logging applications
US7042367B2 (en) * 2002-02-04 2006-05-09 Halliburton Energy Services Very high data rate telemetry system for use in a wellbore

Also Published As

Publication number Publication date
GB2434682A (en) 2007-08-01
GB2434682B (en) 2007-10-10

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20240208