IPC Definitions - January 01, 2012
E21B 47/09 - Definition
This group covers:
Processes or apparatus for determining the whereabouts of a device in the borehole;
Processes or apparatus for finding open or closed sections of a tubular borehole conduit;
Processes or apparatus for detecting the operational state or condition of borehole tools, e.g. the position of the extendable arm of a reamer.
Attention is drawn to the following places, which may be of interest for search:
Measuring depth at borehole or well | E21B 47/04 |
Measuring borehole or well diameter | E21B 47/08 |