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Acoustic data link and formation property sensor for downhole MWD system

  • US 5,924,499 A
  • Filed: 04/21/1997
  • Issued: 07/20/1999
  • Est. Priority Date: 04/21/1997
  • Status: Expired due to Term
First Claim
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1. An acoustic data transmission system for transmitting measured operating, environmental and directional parameters in a well from a first point on a drill string to a second point on the drill string, a portion of the drill string between the first and second points including acoustic noise generated by the drilling process, said system comprising:

  • a first acoustic apparatus for transmitting and receiving an acoustic signal along a path through the drill string; and

    a second acoustic apparatus for transmitting and receiving an acoustic signal along a path through mud in the well annulus.

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