Communications: electrical – Wellbore telemetering or control – Pulse or digital signal transmission
Patent
1984-05-01
1988-02-09
Walsh, Donald P.
Communications: electrical
Wellbore telemetering or control
Pulse or digital signal transmission
367 82, 166 66, 324324, 324333, G01V 100, E21B 2902
Patent
active
047244348
ABSTRACT:
The method uses a tubular shaped and electrically conductive well casing that extends to a geological formation in an oil or gas well. The casing is used for both flowing fluid between the formation and the casing at the top of the well and for communicating data representative of a parameter in the well to the casing at the top of the wall. A tool carrying a switch and an electrical contact is inserted down the inside of the casing. The contact on the tool is connected to the inside of the casing. The flow of the fluid between the geological formation and the casing at the top of the well through the side of the casing above the tool is controlled. A parameter in the well adjacent the formation is sensed. The switch in the tool is operated for sequentially connecting together and disconnecting the contact to a return electrical path to the top of the well for causing changes in the conductance between the casing and the return path representative of data about the parameter. An alternating current signal, formed at the top of the well, is used to interrogate the changes in conductance and retrieve the data.
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Hanson Merle E.
Titchener Paul F.
Comdisco Resources, Inc.
Steinberger Brian
Walsh Donald P.
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