DEVICE FOR FASTENING A FLANGE CONNECTION AT THE WELLHEAD Russian patent published in 2021 - IPC E21B33/04 E21B33/06 F16L23/16 

FIELD: mining; oil and gas industry.

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. The device for fastening the flange connection at the wellhead contains the supporting and wellhead flanges tightened together, and the sealing ring installed between the flanges in grooves with tapered surfaces. The device contains two rectangular bodies, with each rectangular body located at an equidistant distance from the center of the flange connection. The inner ends of the short sides of each rectangular body have a radius equal to the outer diameter of the support and wellhead flanges, and the length of the long sides of each rectangular body is limited by the casing of the support flange. A threaded hole is made in the middle on one of the long sides of each rectangular body. A threaded rod is screwed into the threaded hole of each body, and a support is installed in the lower part of the rod, secured to the rod with a nut. A transverse through hole is made in the upper part of the rod, and a handle for rotating the rod is installed in the transverse through hole of the rod. The handle is provided with cylindrical protrusions at both ends. The device has the ability to mechanically fix the support and wellhead flanges by means of a double body between the fixed long side of the rectangular body and a support that can be moved longitudinally. Both rectangular housings are rigidly fixed to each other by two parallel-mounted clamps.

EFFECT: increasing the tightness of the flange joint at the wellhead and reducing the duration of the assembly of the flange joint at the wellhead.

1 cl, 4 dwg