Dictionary:Drill-pipe log

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A well log that is obtained from an instrument that has a self-contained recording mechanism. The log consists of self-potential (SP) and short and long normals. The tool is lowered through the drill pipe and the flexible electrode assembly is pumped out through a port in the bit. The log is recorded by a tape recorder within the tool during the process of coming out of the hole. The tape is played back to obtain the log. Welex tradename.