FASTENING A FLANGE CONNECTION AT THE WELLHEAD Russian patent published in 2021 - IPC E21B33/03 

FIELD: wellhead equipment.

SUBSTANCE: invention relates to fastening a flange connection at a wellhead. Fastening the flange connection at the wellhead contains a support and wellhead flanges with holes for fastening, a sealing ring installed between the flanges in grooves with tapered surfaces, studs, nuts. The support and wellhead flanges are made with six holes for fastening, six studs are made with lateral blind holes, at the end of the studs there are six segment elements with lateral threaded holes. The segment elements are screwed onto studs and rigidly fixed with screws screwed into the side threaded holes of the segment elements until they stop against the ends of the side blind holes. In the side threaded holes of the segment elements above the screwed-in screws, there are internal annular grooves, into which the split spring retaining rings are inserted, fixing the screws in the side threaded holes of the segment elements from spontaneous flap. Studs with segment elements and nuts are made of material of strength class 12.8 with a thread pitch of 2.5-4 mm. Studs with segment elements from below are inserted into holes for attaching the support and wellhead flanges and form a ring in contact with the support flange, and the nuts on the studs are wrapped from above.

EFFECT: reducing the duration of the assembly of the flange connection of the wellhead equipment, simplifying the maintenance of the device in operation, reducing the duration of fastening the nuts on the studs or bolts, reducing the metal consumption of the structure, reducing the overhaul period and periodic inspections of the fastening of the flange connection at the wellhead for tightness.

1 cl, 5 dwg