DRILL STEM WITH THE DEMOUNTABLE DRILL PIPE JOINT Russian patent published in 2017 - IPC E21B17/04 

FIELD: mining engineering.

SUBSTANCE: drill stem arrangement is offered. It comprises: the drill stem body that includes first and second ends; the first drill pipe joint adapter circuit that includes first and second ends. The first end is connected to the drill stem body first end; the first demountable drill pipe joint with the first end that includes a drill pipe string junction, and the second end that is connected to a drill pipe joint adapter circuit. Along with this, the second end of the first demountable drill pipe joint is connected to the second end of the first drill pipe joint adapter circuit through the faceted adapter plug. Furthermore, the faceted adapter plug comprises a faceted adapting pipe which has a fastening surface, and at least one locking nail that is placed in such a way that it is suitable for the fastening junction between the first demountable drill pipe joint and the first drill pipe joint adapter circuit. With regard to the above mentioned, the first demountable drill pipe joint is connected to the drill stem body in a demountable way by virtue of the first drill pipe joint adapter circuit.

EFFECT: simple tool joint disposal and its substitute on-site of the drill pipe string.

15 cl, 48 dwg