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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47/00
Survey of boreholes or wells
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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
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E21B47/18
through the well fluid; , e.g. mud pressure pulse telemetry
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E21B47/24
by positive mud pulses using a flow restricting valve within the drill pipe
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