Eccentric Drilling tools with casing tube step by step

  1. When drilling, the TGZ reamer swings out and drills a hole wide enough for the casing tube to slide down
    behind the reamer.
  2. When required depth is reached. the drill is reversed and the reamer swings in, allowing the bit to pass
    through the casing.

Eccentric Drilling tools with casing tube step by step pic 2

3. Casing tube is puIIed out directly or fixed at the bottom of the hole by means of cement grout or other aggIutinant.
4. Drilling continues to the desired depth using conventional DTH equipment.

 

Overburden pic 4