WELL TUBULAR STRUCTURE Russian patent published in 2019 - IPC E21B34/14 F16K11/16 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to a well tubular structure, a well system comprising such a structure, and a method of controlling a coupling in such a structure. Well tubular structure comprises tubular part with hole, inner surface and first coupling. Tubular part has axial length. First coupling is configured to slide inside the well tubular part along at least part of the inner surface. First coupling has the first end surface and the second end surface, it contains the first groove of the coupling turned aside from the well tubular part. First groove of the coupling has the first surface of the groove passing radially and facing away from the first end surface. First groove of the coupling has the second surface of the groove inclined to the side from the first surface of the groove. Tubular part has the first inclined surface facing the first end surface of the first coupling. First inclined surface is inclined from inner surface away from first coupling. Tubular part has the second inclined surface facing the first inclined surface. Second inclined surface is inclined from inner surface away from first coupling. First coupling is made with possibility of sliding to the first inclined surface during opening or covering of the hole. Also disclosed are a well system comprising a well tubular structure, and a method of controlling a coupling for opening or closing an opening in a well tubular structure.

EFFECT: technical result consists in improvement of reliability of well tubular structure.

17 cl, 24 dwg