UNIT FOR TIGHTNESS OF TUBING CONNECTIONS (VERSIONS) Russian patent published in 2019 - IPC E21B17/01 E21B17/42 F16L15/04 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry, namely to equipment for hydrocarbon production, and can be used in tubing structures. Seal assembly of tubing connections includes ends of tubing string jointed together by means of tightening thread coupling, as well as sealing gasket. End of one of the tubing string is made in the form of a cup, on the upper part of the inner surface of which there is a thread intended for screwing with a thread of the tightening coupling when the unit is being tightened, at the end of the other tubing the annular projection is made, one of its ends has possibility of contact with barrel bottom, and another one – with tightening coupling. Sealing element is arranged between outer surface of annular projection and inner surface of shell and is made of material having melting point below 300 °C.

EFFECT: seal assembly for tubing joints is proposed.

4 cl, 3 dwg, 1 tbl