Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E21
EARTH OR ROCK DRILLING; MINING
Load children
E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
Load children
47/00
Survey of boreholes or wells
Load children Filter patents View analytics View as hierarchy
E21B47/12
Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
Load children Filter patents View analytics View as hierarchy
E21B47/18
through the well fluid; , e.g. mud pressure pulse telemetry
Load children Filter patents View analytics View as hierarchy
E21B47/20
by modulation of mud waves, e.g. by continuous modulation
Filter patents View analytics View as hierarchy