| 摘要 |
<p>A modular drill pipe section (13) for the transmission of drill navigation data is engageable with like sections and is provided with a coaxially mounted conductor (21) insulated from the pipe interior and providing a space between the conductor and the pipe wall for the passage of drill operating fluid, connectors (24, 26, 28) being provided at each end of the conductor positioned to engage with connectors of like conductors upon coupling of pipe sections.</p> |
