FLANGE CONNECTION OF WELLHEAD EQUIPMENT Russian patent published in 2018 - IPC E21B33/03 F16L27/04 F16L27/53 F16L27/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas production industry, in particular to the equipment for sealing the wellhead when drilling oil and gas wells, and can be used in cases of deviation from the vertical of the derrick or wellhead equipment. Flange connection contains two flanges with a central through-hole. Flanges are connected by means of studs with nuts and washers. In the bores of the flanges facing each other, there is a sealing ring having a central through hole. Flange bores are made in the form of spherical non-convex segments with radius R1, and the ends of the sealing ring interacting with them are in the form of spherical convex segments with radius R1. At the ends of the ring, annular grooves are made, in which the sealing elements of the elastically deformable material are placed. Holes for the studs have a bore in the form of a spherical non-convex segment with a radius of R2, and the washers on the end, which interacts with the hole for the studs, have the shape of a spherical convex segment with radius R2.

EFFECT: technical result is expanded operational capabilities, increased reliability and safety of drilling operations during operation.

1 cl, 1 dwg