Patent ID: 8994550
Filing Date: 2015-03-31
Classification: E21B

Abstract:
1. A method of transmitting data along tubing in a borehole, comprising generating a modulated acoustic signal using a transmitter at a first location on the tubing, and receiving the acoustic signal at a receiver at a second location on the tubing; the method further comprising: (i) generating the acoustic signal at the transmitter at a first frequency and bit rate; (ii) receiving the acoustic signal at the first frequency at the receiver and attempting to synchronize the receiver at the first frequency; and (iiia) if the synchronization is successful, continuing to transmit the acoustic signal so as to pass the data from the transmitter to the receiver; or (iiib) if the synchronization is unsuccessful, adjusting the frequency and bit rate of the acoustic signal and repeating steps (i)-(iii) on the basis of the adjusted signal, wherein the bit rate of the acoustic signal is adjusted to a lower bit rate.