Fishing With A Taper Tap Is a common recovery method in oilfield drilling operations when a part of the drill string or tubular gets stuck or broken off in the wellbore. Here’s a breakdown of how it works and when it’s used: A taper tap is a fishing tool designed with a gradual external taper and hardened threads that can screw into the internal diameter (ID) of a stuck or lost tubular, such as drill pipe, casing, or tubing. Taper Tap Used: When the top of the fish (the object stuck in the well)