A resistivity well log which is obtained from a logging instrument which has a self-contained recording mechanism. The log consists of a SP and short and long normal curves. The tool is lowered through the drill pipe, and the flexible electrode assembly is pumped through a port in the bit. The log is recorded by a tape recorder within the tool during the process of withdrawing pipe from the hole. The tape is played back to obtain the log. Drill Pipe Electric Log is a trademark of Welex.