Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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21/00
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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E21B21/06
Arrangements for treating drilling fluids outside the borehole
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E21B21/063
by separating components
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E21B21/065
Separating solids from drilling fluids
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E21B21/066
with further treatment of the solids, e.g. for disposal
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