Page 253 - Drilling Technology in Nontechnical Language

244 Drilling Technology in Nontechnical Language Second Edition

Fig. 10–8. Borehole geometry log
Courtesy of Schlumberger.

If the drillstring becomes stuck, it is important to know at what depth
the string is stuck. A tool called a free-point indicator (FPI) can be run
inside the pipe that anchors itself to the inside of the drillpipe at two places.
The driller then applies pull to the pipe, and the small amount of stretch in
free pipe can be detected by the FPI tool.

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