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Method and apparatus for transmitting data uphole in a well to the top of the well. A string of electrically conductive tubing and a tool connected to the tubing are lowered down the well along the inside of tubular shaped electrically conductive casing for the well. The inside of the casing is elec

Method and apparatus for transmitting data uphole in a well to the top of the well. A string of electrically conductive tubing and a tool connected to the tubing are lowered down the well along the inside of tubular shaped electrically conductive casing for the well. The inside of the casing is electrically contacted with an electrical contact carried by the tool. A switch in the tool is operated for alternately electrically connecting and disconnecting the contact and thereby the casing and with respect to the conductive tubing for changing the electrical conductance between the tubing and the casing representative of data. The changing conductance is interrogated with an alternating current, formed at the top of the well, to recover the data.

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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 tub

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 comprising an 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.