1) Drilling technology 2) Russian invention 
(from the article `petroleum production`) One variation in rotary drilling employs a fluid-powered turbine at the bottom of the borehole to produce the rotary motion of the bit. Known as the ...
a downhole motor that rotates a bit by the action of the drilling mud on turbine blades b built into the tool. When a turbodrill is used, rotary motion is imparted only at the bit; therefore, it is unnecessary to rotate the drill stem. Although straight holes can be drilled with the tool, it is used most often in directional drilling. 
turbodrill A rotary drill used in oil or gas drilling operations, driven by a turbine motor located inside the well.