A: If no wellbore survey is entered, no wear will be calculated. (Note that you may still have wear in wells that are considered vertical, as some supposedly vertical wells are drilled very poorly. Without a survey, however, PC-PUMP cannot calculate any wear.) You must also click on the Calculate button in the Wear window before results will be displayed. Lastly, if every rod in the deviated section has spin-through guides (and couplings if the Couplings and Guides contact mode is selected), then the wear rate will be reported as zero—see below for more information.

A: If a spin-through centralizer or rod guide is working as designed, there is no sliding contact against the tubing wall, and therefore no wear on the tubing wall. PC-PUMP does not consider wear on or in the guide/coupling.