Reverse Circulation drilling


The reverse circulation drilling is a drilling technique for mining, using a down the hole hammer, Tricone bit or Three-Wings Bit.

Reverse Circualtion : Principle Scheme

Description of the method for the Exploration

Crushed rock is collected in the form of cuttings samples called back within stems contrast to conventional drilling that puts the air inside the stems and cuttings outside. Here the air passes downwards through the annular space between the inner shaft and the outer tube.


  • This method allows to fully recover samples continuously.
  • Quick installation
  • There is no contact between the walls and cuttings taken at the bottom.
  • The penetration rate is fast

Comparative table between RC and coring method


Presentation of the offer RC Technidrill