Percussion drilling definition
Percussion drilling means a drilling method whereby a hammer unit is driven by compressed air giving a series of short, rapid blows to the drill rods or bit, and at the same time applying a rotating motion, with the objective of increasing penetration in hard-rock formations, creating better and larger cuttings of the rock for analysis, and lowering drilling costs;
Percussion drilling means the operation of drilling a hole in rock using bits which are hammered against the rock surface with rotating movement.
Percussion drilling means a drilling method using a cable tool drilling machine or a drilling method whereby the permanent or temporary well casing is driven, or is set into a borehole and then driven.