Stuck Pipe - Free Point Determination
Detection of the stuck point to locate the lowest possible back-off point can be established by stretching the string and using the stretch charts for drillpipe. This method gives only an approximate value for the free point and shall only be used to locate the approximate stuck point for spotting pipe free pills and to provide a starting point for using the Free Point Indicator Tool.
Free Point Indicator Tool
In order to back-off the string at the deepest possible point, a free point indicator tool (FPIT) can be run . . .