CONNECTION DEVICE FOR TUBULAR ELEMENTS Russian patent published in 2024 - IPC E21B17/42 F16L15/04 

FIELD: oil and gas industry.

SUBSTANCE: connecting device (1) for tight connection of tubular elements of strings of gas or oil wells includes the first tubular element (3), the second tubular element (2) and coupling (4) for connecting first tubular element (3) and second tubular element (2). Coupling sleeve (4) has first female section (8) and second female section (7) with first internal thread (10) and second internal thread (9), respectively. First tubular element (3) and second tubular element (2) have first male section (6) and second male section (5), respectively. First male section (6) has a free end with first axial thrust surface (15), and second male section (5) has a free end with second axial thrust surface (13) and outer sealing surface (14) extending between second axial thrust surface (13) and second outer thread (11). Second axial thrust surface (13) is configured to come into contact with first axial thrust surface (15), when first male section (6) and second male section (5) are respectively connected in position of engagement inside first female section (8) and second female section (7). Free end of first male section (6) also has annular sealing edge (16) protruding in axial direction relative to first axial thrust surface (15). Sealing edge (16) has outer periphery (17), on which a section of first external thread (12) is formed, on which first external thread (12) has a conical section and a cylindrical section, which is located in the axial direction between the conical section of the said first external thread (12) and the free end of the first male section (6) so that cylindrical section is at least partially located on sealing edge.

EFFECT: higher reliability and tightness of connection of tubular elements of gas or oil wells.

12 cl, 4 dwg