Deflecting tool (or deviation tools ) is the tool used in directional drilling.
The most common deviation tools for directional drilling are steerable motor assemblies (or so-called positive-displacement motors PDMs) and rotary steerable systems (RSSs). Adjustable-gauge stabilizers, known as “2D rotary systems,” have become quite popular to run with the rotary and PDM assemblies to control inclination. Whipstocks, especially casing whipstocks, are used routinely to sidetrack out of cased wellbores. Other tools, such as turbines, are used mainly in Russia, and jetting bits are seldom used today.