| 摘要 |
<p>A reliable, high data rate, downhole acoustic telemetry system is disclosed. The acoustic telemetry system includes a tubing string (8) with an acoustic transmitter (28) and an acoustic receiver (30) mounted on it. The acoustic transmitter (28) transmits telemetry information by modulating an acoustic carrier frequency that propagates along the walls of the tubing string (8). The transmitter (28) is preferably mounted at a selected position relative to the end of the tubing string (8). The selected position is preferably less than one-quarter wavelength from the end or approximately (n)(wavelength)/2 from the end, where the 'wavelength' is the wavelength of the carrier frequency in the tubing string (8), and 'n' is a positive integer.</p> |
