Snubbing is a type of heavy well intervention which involves running the BHA on a pipe string using a hydraulic workover rig. Unlike wireline or coiled tubing, the pipe is not spooled off a drum but made up and broken up while running in and pulling out, much like conventional drill pipe. Due to the large rigup, it is only used for the most demanding of operations when lighter intervention techniques do not offer the strength and durability. Unlike conventional drilling and completions operations, snubbing can be performed with the well still under pressure - when done so it is called hydraulic workover.
Drilling Systems PSMsim-Snubbing simulator offers the desk top based CWI Management Trainer which covers a number of important well control related operations.