Tubular drill string parts and the corresponding holding device is inserted into the central bore of the tubular drill string part

摘要

[MEANS FOR SOLVING PROBLEMS] Support device may be inserted in the center of the drill string part is (13), It has a diameter of the first along the central portion of the drill string part, has a diameter of the second closest to the end of the drill string part, the diameter of the second is smaller than the diameter of the first is the central hole, Has (14) an elongate body forming a precursor for the transmission line partially along the elongated body and the transverse size is smaller than the diameter of the second (14) elongate body, at least the support device (13) is distinct from (14) and the elongated body is positioned Te, and has a (15) arcuate portions of a plurality of attached thereto. As can be expanded in the first diameter it is possible to bend resiliently as can move through the second diameter, after passing through the diameter of the second (15) arcuate portion, it has a very large string is greater than the diameter of the first in a free state, Support device. [Selection Figure Figure 2