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Method and apparatus using casing and tubing for transmitting data up a well

  • US 4,845,494 A
  • Filed: 05/01/1984
  • Issued: 07/04/1989
  • Est. Priority Date: 05/01/1984
  • Status: Expired due to Fees
First Claim
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1. An apparatus for communicating data, representing a parameter, in one of an oil and a gas well uphole comprising:

  • a well casing extending into the well for conducting current;

    a tubing string disposed within the casing for conducting current and extending into the well;

    a coupling coupled to the tubing string;

    a packing tool supported by and electrically coupled to the coupling and adapted for conducting current in conjunction with the casing and the tubing string, the packing tool comprisingan inflatable packer,means coupled to the tubing string for sensing the parameter and producing an analog signal representative of the parameter and comprising an electronic circuit for converting the analog signal to a coded digital signal representative of the parameter, said means coupled to the tubing string further comprising switch means driven by the coded digital signal for electrically coupling together and decoupling the casing and the tubing string,contact means coupled to the switch means and disposed along the packing tool for contacting the casing when the inflatable packer is in an inflated condition to thereby complete an electrical circuit between the switch means and the casing; and

    means uphole from the packing tool for preventing electrical contact between the casing and the tubing string.

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