PREMIUM CLASS THREADED SHOULDERED CONNECTION Russian patent published in 2021 - IPC E21B17/42 F16L15/00 

FIELD: engineering elements.

SUBSTANCE: group of inventions relates to threaded pipes and connections of such pipes that can be used in the petroleum and gas industry. The threaded pipe connection comprises: a nipple with an external thread, a sealing surface of the nipple and a stop face of the nipple located at the free end, and a sleeve for receiving the nipple. The sleeve has an internal thread intended to interact with the external thread, a sealing surface of the sleeve intended to come into contact with the sealing surface of the nipple and form a seal, and a stop shoulder intended to come into contact with the stop face of the nipple. The sealing surface of the nipple is therein located at a distance from the stop face of the nipple in the axial direction, wherein a gap is made between the seal and the stop face of the nipple between the nipple and the sleeve. The nipple and the sleeve define a longitudinal axis. The stop face of the nipple therein has a first stop surface of the nipple, facing outward, and a second stop surface of the nipple, facing inward. The first stop surface of the nipple therein crosses the axis perpendicular to the longitudinal axis at a first angle, and the second stop surface of the nipple crosses the perpendicular axis at a second angle. The first stop surface of the nipple and the second stop surface of the nipple converge at the top of the nipple to form a recess. The stop shoulder of the sleeve has a first stop surface of the sleeve, facing inward, and a second stop surface of the sleeve, facing outward. The first stop surface of the sleeve therein crosses the axis perpendicular to the longitudinal axis at a third angle, and the second stop surface of the sleeve crosses the perpendicular axis at a fourth angle, wherein the first stop surface of the sleeve and the second stop surface of the sleeve converge at the top of the sleeve to form a face edge.

EFFECT: provision of alignment, straightening or minimisation of bend of a nipple in the sleeve.

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