For the rig, the third point is suitable tools.
First, generally speaking, If the hole depth is over 20 meters, DTH and Rotary Drill hole’s straightness is significantly higher than the top hammer. But in addtion, since the top hammer drilling rig is a full hydraulic multi, from the point of energy conduction, hydraulic is higher efficiency,lower cost.Therefore, the user must balance the relationship between economy and hole straightness.
Second, it is the selection of the drilling bits,follow these three principles:
Ballistic buttons are better than spherical buttons
Ballistic buttons’ rock penetration is significantly stronger than spherical buttons, Possibility deflected when encounter cracks is small, at the same time it lead to higher drilling speed.
of course, Ballistic buttons has slightly higher price, lower lifetime.
