Download Cerberus User Guide

Appendix F Glossary
-NNewtonian fluid
The model for fluids that flow in a linear manner. Few oil field fluids are truly Newtonian, but the Newtonian
model is the best known and easiest to understand. Fresh water can be modeled as a Newtonian fluid.
nominal wall thickness
The target wall thickness sold by the manufacturer and commonly referred to by users. The actual wall size
may vary within the plus and minus specifications quoted by the manufacturer.
-Oorbital butt weld
Performed using an automated welder to join two lengths of tubing. The resulting weld is typically more consistent than a manual butt weld, but is not necessarily better. Orbital welders are expensive and are not often
encountered in the field.
-PPOOH
An abbreviation for "pulling out of hole".
position
The distance measured from the reel core end of a string to the point in question. The reel core end is at position zero. Position is not related to depth, although depth is measured from the free end of a string.
Power Law Model
The model for fluids which do not flow in a linear manner. Many oil field fluids, including water-based muds,
gels, and hydrocarbons, are modeled using the Power Law model.
-Q-Rradial stress
The stress through the CT wall due to inner and outer pressure. The radial stress is part of the Von Mises stress.
reel back tension
The tension maintained at the reel to ensure that the tubing on the reel does not uncoil or become slack. Reel
back tension only affects the surface weight calculation, not the downhole forces, since the tubing is held at the
injector.
426
NOV CTES
Cerberus 11.0 User Guide