Percussion drilling

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: FIXED CONSTRUCTIONS
Class:: EARTH OR ROCK DRILLING; MINING
Subclass:: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

CABLE(S) drilling of boreholesPERCUSSION drilling in deep-drillingpercussive tools

4 direct subcodes

Navigate with arrow keys, Enter to open

E21B 1/02 Surface drives for drop hammers, e.g. with a cable
E21B 1/12 with a reciprocating impulse member
E21B 1/36 Tool-carrier piston type, i.e. in which the tool is connected to an impulse member
E21B 1/38 Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member