Drilling rig classification-By method of rotation or drilling method

Drilling rig classification-By method of rotation or drilling method

• No-rotation includes direct push rigs and most service rigs
• Rotary table — rotation is achieved by turning a square or hexagonal pipe (the "Kelly") at drill floor level.
• Top drive — rotation and circulation is done at the top of the drill string, on a motor that moves in a track along the derrick.
• Sonic — uses primarily vibratory energy to advance the drill string
• Hammer — uses rotation and percussive force (see Down-the-hole drill)