Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

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

Scope Notes

Limiting references: Freeing objects stuck in boreholes by flushing

Related Keywords

flushing BOREHOLEScompositions for laying DUST in connection with the operation of percussive toolseliminating DUST during drilling in minesFLUSHING of boreholes

9 direct subcodes

Child Classifications

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E21B 21/01 Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
E21B 21/02 Swivel joints in hose lines
E21B 21/06 Arrangements for treating drilling fluids outside the borehole
E21B 21/08 Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
E21B 21/1 Valves arrangements in drilling-fluid circulation systems
E21B 21/12 using drilling pipes with plural fluid passages, e.g. closed circulation systems
E21B 21/14 using liquids and gases, e.g. foams
E21B 21/16 using gaseous fluids
E21B 21/18 Preventing exhaust air from the drill motor from blowing-off towards the working face