Transmission of data in boreholes

摘要: Data is transmitted along a borehole containing drill stem ( 2 ) by means of transmitter 6 which converts electric data signals to acoustic propagating the ). The are converted back form receiver 12 also processes signals. In preferred stored in memory 15 for subsequent retrieval using pick-up tool 5 lowered into borehole. system particularly useful moving past an obstruction such as shut-in valve 4