1. 
   Turbodrill
   A turbodrill is a tool used mostly by petrochemical companies to dig wells for crude oil and natural gas reserves. ==History of turbodrilling== ==How a turbodrill works== Turbodrills use the mechanical energy of the drill itself, and the hydraulic energy provided by the oil rig’s mud pumps to del...
   Found op http://en.wikipedia.org/wiki/Turbodrill
   
   
2. 
   turbodrill
   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 us...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   turbodrill
   (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 ...
   Found op http://www.britannica.com/eb/a-z/t/93
   
   
4. 
   turbodrill
   turbodrill A rotary drill used in oil or gas drilling operations, driven by a turbine motor located inside the well.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2197/3
   
   

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