WELLHEAD FLANGE CONNECTION Russian patent published in 2021 - IPC E21B33/03 F16L23/02 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining, in particular to the oil and gas industry, and can be used when repairing wells in the process of sealing the wellhead using flange connections of wellhead equipment. A flange connection of wellhead equipment is proposed, comprising a support and wellhead flanges with holes for fastening and a sealing ring installed between the flanges in grooves with tapered surfaces. On top of the wellhead flange, there is a centralizer ring with an internal cylindrical recess and blind threaded holes at the bottom. The diameter of the inner cylindrical selection of the centralizer ring is determined according to the following relationship: D_i=k₁⋅D_f, where D_i is the diameter of the inner cylindrical selection of the centralizer ring, mm, k₁ is the coefficient obtained experimentally (1.004-1.006), and D_f is the outer diameter of the reference and wellhead flanges, mm. In this case, the lower end of the inner cylindrical recess of the centralizer ring is located below the upper end of the support flange. The center-to-center diameter, the number of holes, as well as the central angle between the holes of the centralizer ring are equal to the center-to-center diameters, the number of holes, as well as the central angles between the holes for fastening made in the support and wellhead flanges. Pins equipped with external threads are screwed into the blind threaded holes of the centralizer ring, and the fingers of the centralizer ring can be placed in the holes of the support and wellhead flanges and fasten the flange connection of the wellhead equipment with nuts

EFFECT: invention increases the tightness of the flange connection of the wellhead equipment, by eliminating damage and misalignment of the sealing ring, which also extends the life of the sealing ring.

1 cl, 3 dwg