CPC E21B 47/095 (2020.05) [E21B 34/14 (2013.01); E21B 31/03 (2013.01)] | 14 Claims |
8. A method for determining a location of an untethered device in a wellhead of a subterranean well, the method comprising:
determining, by a microprocessor in the untethered device, a presence of the untethered device inside or close to the wellhead in response to data received by a sensor in the untethered device;
activating, by the microprocessor, a transducer in the untethered device to produce an acoustic signal;
receiving, with a microphone array of a receiver unit, the acoustic signal from the transducer, the microphone array comprising a plurality of microphones placed outside the surface of the wellhead at specific locations;
processing the acoustic signal with a microprocessor of the receiver unit to generate a signal for delivery to a wireless transmitter, the signal identifying a microphone in the microphone array that is closest to the untethered device; and
transmitting the signal with the wireless transmitter to a remote wireless receiver to notify a user of the presence of the untethered device in the wellhead.
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