Kerr-mcgee Corporation

Howard C Eberline

Jack L Moon

A logging method and apparatus for measuring parameters of an earth formation near a borehole wherein a first downhole logging device is connected to a first surface measuring apparatus via a coaxial cable in a first mode of operation of the logging apparatus and wherein a second downhole logging device is connected to a second surface measuring apparatus and to a surface power supply via the coaxial cable in a second mode of operation of the logging apparatus, the second downhole logging device being connected to the coaxial cable in response to the surface power supply being connected to the coaxial cable. In one mode of operation, electrical communication is established between the first downhole logging device and the first surface measuring apparatus and either the positive or the negative terminal of the surface power supply in the first mode of operation of the logging apparatus and, in the second mode of operation of the logging apparatus, electrical communication is established between the second downhole logging device and the second surface measuring apparatus and one of the terminals of the surface power supply, opposite the terminal of the surface power supply connected to the first downhole logging device in the first mode of operation, the logging apparatus being conditioned in the first mode of operation in response to one of the positive and negative terminals of the surface power supply being connected to the coaxial cable and the logging apparatus being conditioned in the second mode of operation in response to the opposite terminal of the surface power supply being connected to the coaxial cable.

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Edmond, OK, United States of America

Howard C Eberline