Methods employed for drilling

Methods employed for drilling

The methods used are;

1.  Percussive drilling,

2.  Rotary drilling

The percussive method is further sub-divided as:

(a)  Drilling by rigid rods.

(b)  Rope drilling, also known as cable drilling or churn drilling.

The rotary method may be used with a view to get a core of the rocks passed through, or simply to drill a hole, and this decides the type of drilling tool used. The rotary method is subdivided as:

(a)  Drilling by saw toothed, cutter.

(b)  Drilling by tricone rock roller bit.

(c)  Drilling by diamond drill bit.

(d)  Drilling by chilled shots.