Drilling Trip Sheet Calculations & Download
We will know from experience that the most challenging physical job on a drilling rig (also check: rig components) is when we are tripping pipe in and out of the hole. We will also know that we count the pipe in and we count the pipe out. The reason for counting the pipe is so the driller knows where the drilling bit & the BHA is in the well (BOP stack, Shoe, Etc.). The pipe count also checks that nothing untoward happens in the well during the trip.
https://www.drillingmanual.com/drilling-trip-sheet-calculations-download/