FIELD: mining.
SUBSTANCE: proposed invention pertains to a drilling tool, and particularly to flexible drill pipes. The technical outcome is the possibility of bending a well shaft with the least path curvature. The drilling tool comprises at least, one drilling shaft, with a series of coaxial ring elements, joined together with provision for flexibility of adjacent ring elements relative each other in the axial plane. Each ring element is joined to the adjacent ring element by a coupling member, meant for torque transmission between them. Axial bearings pass between adjacent ring elements for transfer of axial loads between them. The coupling element and the axial bearings consist of identical or distinct physical structures.
EFFECT: possibility of bending a well shaft with the least path curvature.
22 cl, 17 dwg
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