TIGHT THREADED CONNECTION OF TUBING Russian patent published in 2024 - IPC E21B17/42 F16L15/04 

FIELD: connections or fittings for pipes.

SUBSTANCE: invention relates to designs of threaded connections for oilfield pipes operating in difficult conditions. Tight threaded connection of tubing consists of pipe with conical thread, coupling with mating conical threads and annular grooves at the ends and internal bore in the middle part. At the same time the coupling contains additional grooves in the conical thread at equal distance from the end face and internal bore in the middle part. Width of additional groove is equal to one and a half pitch of conical thread. At that, additional grooves are equipped with O-rings from fluoroplastic, internal diameter of which is equal to internal diameter of conical thread in place of their execution, and containing conical thread on internal surface, similar to conical thread of tubing.

EFFECT: increasing the tightness of the threaded connection of tubing when exposed to a temperature gradient that occurs between the pipe and the coupling during various technological operations.

1 cl, 3 dwg