IPC Definitions - January 01, 2012

E21B 47/09 - Definition fr

Definition statement

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.

Informative references

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