Patent ID: 9746574
Date: 2017-08-29
CPC Classifications: E21B,G01V

Claim:
1. An apparatus configured to evaluate a volume of interest of an earth formation intersected by a borehole, the apparatus comprising: a tool body configured to be conveyed in the borehole, the tool body having thereon: an electrical system configured to provide current measurements at the transceiver electrode indicative of a resistivity parameter of the volume of interest, the electrical system configured to be switched between a first operational mode and a second operational mode, wherein: in the first operational mode, the electrical system maintains the tool body at a first electrical potential, and maintains the multi-function electrode and the transceiver electrode at a second electrical potential different than the first potential; and in the second operational mode, the electrical system maintains the tool body at the first electrical potential, maintains the multi-function electrode at the first electrical potential, and maintains the transceiver electrode at the second potential different than the first potential.