WELLHEAD FLANGE CONNECTION Russian patent published in 2020 - IPC E21B33/04 

FIELD: mining.

SUBSTANCE: invention relates to mining, particularly to oil and gas industry, and can be used in repair of wells during sealed wellhead sealing using flanged connections of wellhead equipment. Flanged connection of wellhead equipment includes support and mouth flanges, sealing ring installed between flanges in grooves with conical surfaces. In addition, the device is equipped with an upper ring, and on the periphery of the upper ring there are two holes located at angle of 180° relative to each other. Device is also equipped with two lower semi-rings, and on periphery of each lower semi-ring two holes are made, located at angle of 180°. Center-to-center diameters of holes of upper ring and lower semi-rings are equal to each other, at that holes of upper ring and two lower semi-rings are arranged with the possibility of arrangement one under another, as well as fixation and tightening by two threaded joints of upper ring and lower semi-rings, which provides tightness of connection of wellhead and support flanges with installed between them a sealing ring. Each threaded connection consists of a bolt, a nut and a cotter pin, for which a hole is made in the lower part of the bolt. Length of thread of threaded connection is greater than height of gap between support and wellhead flanges, and distance from lower end of nut of threaded connection to opening of cotter pin is smaller than inner height of lower rings.

EFFECT: increased tightness of flanged connection of wellhead equipment, reduced duration of assembly of flanged connection of wellhead equipment, reduced costs for production of wellhead and support flanges.

1 cl, 4 dwg