One can take rod of set for ground testing as one of electrodes in four-point set for measuring of specific resistivity of soil. With help of current and voltage measuring on electrodes of this set, we can obtain value of specific resistivity of soil with accordance of depth.
Logging tools for electromagnetic flaw detection, developed in VNIIGIS, provide inspecting well conditions with and without (EMDS-TM-42 tools) lifting of compressor tubing. In case of inspecting with lifting of tubing (EMDS-S tool) we can observe holes, made by drilling perforation tool. Examples of logging investigations in Russia, Oman and China are presented.