1. 
   drill stem
   all members in the assembly used for rotary drilling from the swivel to the bit, including the kelly, drill pipe and tool joints, drill collars, stabilizers, and various specialty items. Compare drill string.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   drill stem
   all members in the assembly used for rotary cutting from the swivel to the ball, including the kelly, drill pipe and tool joints, drill collars, stabilizers, and various specialty items. Compare drill string.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   

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