IPC Subgroup
E21B 21/16 using gaseous fluids
Introduced: January 2000
Last revised: January 2006
Full Title
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor > using gaseous fluids
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: Methods or apparatus for flushing boreholes using liquids and gases, e.g. foams