BOHRROHR

摘要

The invention relates to a drill pipe having connectors which are welded to the upset ends and, having a widened gripper stop area and designed as a plug and socket element, can be screwed to one another by means of their thread sections of complementary conical design and whose inner width is less than that of the undeformed pipe, in which arrangement the pipe ends are of identical design with regard to the upsetting and have an intermediate section lying between the cylindrical bore of the undeformed pipe and the upset head and having an inner width decreasing in the direction of the weld, and the connector designed as a socket is provided on the outside with a shoulder at the transition from the weld area to the widened gripper stop area. With the invention, a drill pipe is created which, taking into account the API regulations to be observed, with regard to minimising the pressure losses for the drilling fluid and susceptibility to failure at the critical points, is suitable for use at great drilling depths and can be manufactured cost-effectively with great reliability in production.