TECHNICAL REVIEW : BOREHOLE DRILLING AND
2016-10-19 · 3 Methods of drilling boreholes 25 3.1 Common drilling methods 26 4 Drilling equipment 31 4.1 Choosing a drilling rig 31 4.1.1 Percussion drilling 32 4.1.2 Heavy duty cable tool 32 4.1.3 Rotary drilling 33 4.2 Drilling rig components 35 4.2.1 Drill bit 35 4.2.2 Hammer 36 Table of contents
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