COUPLING THREADED CONNECTION (OPTIONS) Russian patent published in 2022 - IPC F16L15/00 

FIELD: pipelines threaded connections.

SUBSTANCE: invention relates to threaded connections of pipe lengths, namely to connections of drill pipes, casing pipes, tubing pipes, collapsible pipelines, as well as long flexible pipes and rods. A coupling threaded connection consists of two connected pipes with external threads on nipples with different pitches, end mating beveled or wavy external thread runs, a coupling with mating internal threads, end or lateral mating splines at the ends of the pipes, a sealing seal located in a groove on the contact mating planes. The seal is made of elastic or hollow metal. Alternatively, the mating planes are tapered. When using a metal-to-metal seal, the male part of the external thread run is inserted into the female part of the external thread run only by axial movement, due to the absence of rotation of the pipes relative to each other. To transmit the moment of rotation, end slotted crowns are used, which, as an option, are made in the form of a multi-spline crown or a “half-pipe” type. With high tightness requirements and a large weight of the tubing string, elastic seals can be additionally installed between the metal-to-metal seals. In the case of using longitudinal internal baffles dividing the inner cavity of the pipe string into two channels, the latter can be welded or soldered to the pipe walls.

EFFECT: increases the multifunctionality of the tubular string, the strength and tightness of the coupling threaded connection.

10 cl, 26 dwg