Condition for working coiled tubing though a pressurized stripper, where wellbore pressure applied against the cross-sectional area of the tube creates an upward acting force greater than the weight of the tubing in the wellbore. In this condition, mechanical assistance is required to apply thrust to the tubing while injecting or to maintain control of the tubing when extracting. This condition is commonly called "light pipe operations".

Used to control the boats in the "locking-through" process. Taking many forms snubbing could be large wooden posts along the lock walls or metal posts and rings to which the boats were tied