| 摘要 |
The invention relates to a drill stem (3) for deep drillings, comprising a plurality of drill pipes (10) having hollow drilling bodies (12) made of electrically conductive material and bushings (11) having bushing bodies (27) made of electrically conductive material. In order to obtain rapid and exact information from the drilling site, an electric pole is formed by the drill stem bodies consisting of the hollow drilling bodies (12) and the bushing bodies (27) and the other electric pole is formed by at least one conductor (7) which is electrically insulated with respect to the drill stem body and is arranged inside the drill stem body, thereby making it possible to transfer both energy and data. |
