| 摘要 |
<p>An apparatus for the remote transmission of information from a borehole to the surface of the earth is disposed in a drilling pipe string of a drilling device. The drilling device further comprises a rotary drill bit and a pump which pumps the flushing liquid downwards in the flow passage of the drilling pipe string, through the rotary drill bit and upwards in an annular space surrounding the pipe string. The apparatus has devices for ascertaining information data, for converting the information data into electrical control signals and for producing pressure pulses in the downwardly directed flow of the flushing liquid. The devices are disposed in a chamber which is bounded internally by the flow passage and externally by an outer tube (see Fig. 1).</p> |
