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

Full Title

Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B21/08) > 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

Child Classifications

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• E21B 47/125 using earth as an electrical conductor (by electromagnetic energy E21B47/13)
• E21B 47/13 by electromagnetic energy, e.g. radio frequency
• E21B 47/138
• E21B 47/14 using acoustic waves