Oil and Gas Well Drilling and Servicing eTool
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Drill Collar

Drill CollarA heavy, thick-walled tube, usually steel, used between the drill pipe and the bit in the drill stem. It is used to put weight on the bit so that the bit can drill.*


 

*This is an abridged version of the Dictionary of Petroleum Terms used with permission from PETEX®, The University of Texas, at Austin. All rights reserved © PETEX 2001.