GB2392685A - Synchronous CDMA telemetry system for use in a wellbore - Google Patents

Synchronous CDMA telemetry system for use in a wellbore

Info

Publication number
GB2392685A
GB2392685A GB0318327A GB0318327A GB2392685A GB 2392685 A GB2392685 A GB 2392685A GB 0318327 A GB0318327 A GB 0318327A GB 0318327 A GB0318327 A GB 0318327A GB 2392685 A GB2392685 A GB 2392685A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
wellbore
use
telemetry system
synchronous cdma
outputs
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
GB0318327A
Other versions
GB0318327D0 (en )
GB2392685B (en )
Inventor
Wallace R Gardner
Roger L Schultz
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

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/12Means 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V1/00Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/22Transmitting seismic signals to recording or processing apparatus
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V1/00Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/40Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging

Abstract

A synchronous CDMA telemetry system (10) is provided for use in a wellbore. In one described embodiment, each data bit of digital outputs (24,26) of multiple downhole data sources is multiplied by an orthogonal code (28,30) unique to each data source. The resulting encoded outputs are modulated on a carrier frequency (32,34) and summed (38) on a transmission channel (36). The resulting signal is demodulated (44,46) at a remote location and separately multiplied by each of the codes (48,50) to separate out the contributions to the signal from each data source. The individual demodulated and decoded outputs are then integrated (52,54) over the length of each data bit.
GB0318327A 2001-03-07 2001-03-07 Synchronous CDMA telemetry system for use in a wellbore Expired - Fee Related GB2392685B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2001/007181 WO2002073004A1 (en) 2001-03-07 2001-03-07 Synchronous cdma telemetry system for use in a wellbore

Publications (3)

Publication Number Publication Date
GB0318327D0 GB0318327D0 (en) 2003-09-10
GB2392685A true true GB2392685A (en) 2004-03-10
GB2392685B GB2392685B (en) 2005-01-19

Family

ID=21742379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0318327A Expired - Fee Related GB2392685B (en) 2001-03-07 2001-03-07 Synchronous CDMA telemetry system for use in a wellbore

Country Status (2)

Country Link
GB (1) GB2392685B (en)
WO (1) WO2002073004A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859472A1 (en) * 1997-02-13 1998-08-19 Alcatel Alsthom Compagnie Generale D'electricite Code division multiple access transmitter
US5905721A (en) * 1996-09-26 1999-05-18 Cwill Telecommunications, Inc. Methods for channel estimation and signal detection of CDMA signals
US5933454A (en) * 1994-06-02 1999-08-03 Amati Communications Corporation Multi-carrier data transmissions system using an overhead bus for synchronizing multiple remote units
WO2000029717A2 (en) * 1998-11-17 2000-05-25 Schlumberger Technology Corporation Communications system having redundant channels
WO2001008326A1 (en) * 1999-07-23 2001-02-01 Itt Manufacturing Enterprises, Inc. Chip-synchronous cdma multiplexer and method resulting in constant envelope signals

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6144859A (en) * 1993-08-27 2000-11-07 Aeris Communications, Inc. Wireless cellular communicator system and apparatus
US6046685A (en) * 1996-09-23 2000-04-04 Baker Hughes Incorporated Redundant downhole production well control system and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933454A (en) * 1994-06-02 1999-08-03 Amati Communications Corporation Multi-carrier data transmissions system using an overhead bus for synchronizing multiple remote units
US5905721A (en) * 1996-09-26 1999-05-18 Cwill Telecommunications, Inc. Methods for channel estimation and signal detection of CDMA signals
EP0859472A1 (en) * 1997-02-13 1998-08-19 Alcatel Alsthom Compagnie Generale D'electricite Code division multiple access transmitter
WO2000029717A2 (en) * 1998-11-17 2000-05-25 Schlumberger Technology Corporation Communications system having redundant channels
WO2001008326A1 (en) * 1999-07-23 2001-02-01 Itt Manufacturing Enterprises, Inc. Chip-synchronous cdma multiplexer and method resulting in constant envelope signals

Also Published As

Publication number Publication date Type
GB0318327D0 (en) 2003-09-10 grant
WO2002073004A1 (en) 2002-09-19 application
GB2392685B (en) 2005-01-19 grant

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Legal Events

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

Effective date: 20150307