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Well logging communication system

  • US 4,355,310 A
  • Filed: 08/06/1979
  • Issued: 10/19/1982
  • Est. Priority Date: 02/03/1977
  • Status: Expired due to Term
First Claim
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1. Method for the transmission of digital data via a signal transmission line between a downhole apparatus and a surface apparatus in a system for the exploration of subsurface formations traversed by a borehole, wherein said downhole apparatus comprises a plurality of logging tools, a common bus line, and a plurality of universal interfaces, each interface associated with and connecting one of the tools to said bus line in parallel and having assigned thereto a specific address unique to itself and a universal address, common to all the interfaces;

  • and wherein said system has a plurality of operating modes for the transmission of data including a free-running mode and a command response mode;

    said method comprising, the steps of;

    (a) transmitting a command message with a universal address from the surface apparatus, over said bus line to all of said interfaces, said universal address command message identifying the free-running mode for data transmission, whereby all of said tools are activated in the free-running mode to transmit a predetermined quantity of data in a predetermined sequence; and

    (b) transmitting a command message with a specific address from the surface apparatus over said bus line for activation of a specific one of said tools in the command-response mode, said specific address command message identifying the length of the data message to be sent by said one tool, whereby said one tool is activated in the command response mode to transmit the prescribed quantity of data.

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