Shell Oil Comapny

Peter Anthony Crossley

Harold J Vinegar

Frederick Gordon Carl, Jr

William Mountjoy Savage

Robert Rex Burnett

John Michele Hirsch

A petroleum well ( ) for producing petroleum products that incorporates a system adapted to controllably measure a formation resistivity using induction chokes ( - ) to form electrically isolated piping structure sections that can be used as the formation contact electrodes for time-varying current, and methods of producing petroleum products while measuring formation resistivity, are provided by the present invention. The system comprises a first induction choke ( ), a second induction choke ( ), and a device ( ). The first induction choke ( ) is located about a piping structure ( ) of the well ( ). The second induction choke ( ) is also located about the piping structure ( ) of the well ( ), but the first induction choke ( ) is distally spaced from the second induction choke ( ). The device ( ) is located outside of the piping structure ( ) and comprises two terminals ( ). A first of the terminals ( ) extending from the device ( ) is electrically connected to the piping structure ( ) on one side ( ) of the first induction choke ( ). A second of the terminals ( ) extending from the device ( ) is electrically connected to the piping structure ( ) on another side ( ) of the first induction choke ( ), between the first and second induction chokes ( ), such that the downhole device ( ) is electrically connected across an outside of the first induction choke ( ). The system can further comprise other induction chokes ( ), other terminals ( ) extending from the device ( ), a current sensor ( ), a surface power source ( ), a power transformer ( ), a communications transformer ( ), a surface modem ( ), a downhole modem ( ), a direct current power supply ( ), and/or a power amplifier ( ). The piping structure can comprise at least a portion of a well casing ( ), such that the well casing ( ) acts as an electrode for making formation resistivity measurements due to the induction chokes ( ).

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Austin, TX, United States of America

Peter Anthony Crossley