Electromagnetic induction method and apparatus for the measurement of the electrical resistivity of geologic formations surrounding boreholes cased with a conductive liner
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United States of America Patent
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Sep 25, 2001
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N/A
app pub date -
Sep 13, 1999
filing date -
Sep 13, 1999
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Abstract
Provided is a technique, including a method and a computer program product, to dynamically measure characteristics of geologic formations while hydrocarbons are being extracted therefrom. Specifically, the present invention allows measuring the resistivity of geologic formations in which a borehole has been formed therein and encased with a conductive casing, such as a conductive liner. This has been achieved by providing a method and computer program product that compensates for the effects of a conductive liner by measuring the characteristics of the geologic formation as a function of a ratio of two magnetic fields sensed by a receiver disposed in one of the boreholes.
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