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Electromagnetic lithosphere telemetry system

  • US 4,087,781 A
  • Filed: 05/03/1976
  • Issued: 05/02/1978
  • Est. Priority Date: 07/01/1974
  • Status: Expired due to Term
First Claim
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1. A system for telemetry of parameter measurements from the bottom of an oil well to the surface of the earth comprising in combination:

  • means for measuring physical parameters in an oil well bore hole;

    means for digitizing mesurements of said physical parameters;

    means for transmitting said digitized measurements upon a carrier signal, said transmitting means comprising a first solenoidal antenna;

    one or more means for receiving signals transmitted by said transmitting means, said receiving means being located between said oil well bottom and said surface;

    one or more means for retransmitting received signals, one of said retransmitting means being coupled to each of said receiving means;

    one or more second solenoidal antennas, one of said second solenoidal antennas being coupled to said receiving and retransmitting means;

    means for receiving retransmitted signals at the surface of the earth; and

    said signals transmitted by said transmitting means and said retransmitted signals comprising electromagnetic radiation fields having a frequency below 30 Hz.

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