Submersible logging tools are used for online monitoring, registration and transferring current parameters of equipment operation to external devices. The parameters are the following: circuit insulation resistance, pressure and temperature of formation fluid, volume water content. Submersible logging tools include downhole well module KSAT-MMP and surface unit KSAT-MMN. They serve for simultaneous measuring and storing technological parameters; long-time monitoring of wells without lift; generating and transferring data to personal computer; information reading from the storage of surface unit without recording braking and pulling out downhole module from well, etc.