Down-hole impacting means, e.g. hammers

Introduced: January 1980

Last revised: January 2006

Full Title

Drives for drilling, used in the borehole > Down-hole impacting means, e.g. hammers

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

Limiting references: Boring rams

4 direct subcodes

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E21B 4/08 impact being obtained by gravity only, e.g. with lost-motion connection
E21B 4/1 continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
E21B 4/12 Electrically operated hammers
E21B 4/14 Fluid operated hammers