Method and system for downhole clock synchronization

Hall, David R.; Bartholomew, David B.; Johnson, Monte; Moon, Justin; Koehler, Roger O.

Title: Method and system for downhole clock synchronization

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Abstract

A method and system for use in synchronizing at least two clocks in a downhole network are disclosed. The method comprises determining a total signal latency between a controlling processing element and at least one downhole processing element in a downhole network and sending a synchronizing time over the downhole network to the at least one downhole processing element adjusted for the signal latency. Electronic time stamps may be used to measure latency between processing elements. A system for electrically synchronizing at least two clocks connected to a downhole network comprises a controlling processing element connected to a synchronizing clock in communication over a downhole network with at least one downhole processing element comprising at least one downhole clock. Preferably, the downhole network is integrated into a downhole tool string.

Inventors:: Hall, David R.; Bartholomew, David B.; Johnson, Monte; Moon, Justin; Koehler, Roger O.

Issue Date:: 2006-11-28

Research Org.:: IntelliServ, Inc., Provo, UT (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1176012

Patent Number(s):: 7142129

Application Number:: 10/710,875

Assignee:: IntelliServ, Inc. (Provo, UT)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS

E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING

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G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
G01V1/26 - Reference-signal-transmitting devices, e.g. indicating moment of firing of shot
G01V11/002 - {Details, e.g. power supply systems for logging instruments, transmitting or recording data, specially adapted for well logging, also if the prospecting method is irrelevant

E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
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

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DOE Contract Number:: FC26-01NT41229

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING

Citation Formats


                    Hall, David R., Bartholomew, David B., Johnson, Monte, Moon, Justin, and Koehler, Roger O. Method and system for downhole clock synchronization.  United States: N. p., 2006. 
        Web.

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                    Hall, David R., Bartholomew, David B., Johnson, Monte, Moon, Justin, & Koehler, Roger O. Method and system for downhole clock synchronization.  United States.

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                    Hall, David R., Bartholomew, David B., Johnson, Monte, Moon, Justin, and Koehler, Roger O. Tue .  
        "Method and system for downhole clock synchronization".  United States.  https://www.osti.gov/servlets/purl/1176012.

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@article{osti_1176012,

  title        = {Method and system for downhole clock synchronization},

  author       = {Hall, David R. and Bartholomew, David B. and Johnson, Monte and Moon, Justin and Koehler, Roger O.},

  abstractNote = {A method and system for use in synchronizing at least two clocks in a downhole network are disclosed. The method comprises determining a total signal latency between a controlling processing element and at least one downhole processing element in a downhole network and sending a synchronizing time over the downhole network to the at least one downhole processing element adjusted for the signal latency. Electronic time stamps may be used to measure latency between processing elements. A system for electrically synchronizing at least two clocks connected to a downhole network comprises a controlling processing element connected to a synchronizing clock in communication over a downhole network with at least one downhole processing element comprising at least one downhole clock. Preferably, the downhole network is integrated into a downhole tool string.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2006},

  month        = {11}

}

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