Air Percussion Drilling

This method is similar to direct Mud Rotary Drilling except that compressed air is used to transport the cuttings to the surface. Using compressed air, a percussion hammer attached to the drill string pulverises the rock or material below and then blows it back up the annular space of the borehole to the surface.

Advantages of Air Percussion Drilling

  • Fastest penetrating method through hard rock
  • Immediate visible indication of water with the opportunity to determine quantity and quality of water encountered
  • Excellent method for sampling of hard rock for site investigation methods
  • Disadvantages of Air Percussion Drilling
  • High cost of sufficient capacity compressors
  • High cost of diesel consumption
  • High cost of percussion equipment and drill bit wear
  • Difficult method for loose overburden formations, due to high up-hole velocities

 

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