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Air Hammers

Nevis' exclusive Air Hammer design is invaluable when drilling into porous and underpressured formations. Drilling rates of penetration (ROP) with an air hammer have been shown to be 6 to 10 times faster than a conventional mud and bit system. Nevis offers a large inventory of Air Hammers ranging in size and capability.

 
Air Hammer Cycle
  
Stage 1
OFF BOTTOM
Piston ports not alligned with control rod windows, air vents through hammer
Stage 2
ON BOTTOM
Air fills the bottom chamber and forces the piston upwards. Upper piston ports allign with control rod window
 
   
 
Back Flow Valve
(Check Valve)
 
Control Rod
(Feed Tube)
 
Piston
 
Lock Rings
(Bit Retaining Rings)
 
Air Flow
 
 
Stage 3
ON BOTTOM
The lower piston port passes control windows. Air compressed in upper chamber forces the piston downwards.
Stage 4
ON BOTTOM
As the upper chamber is forced open, the air exhausts through the bit and foot valve. Simultaneously the bottom chamber begins to fill through the upper piston port. The cycle then repeats.