METAL SEALING ASSEMBLY FOR SEALING ANNULAR SPACE IN WELL Russian patent published in 2020 - IPC E21B33/12 

FIELD: mining.

SUBSTANCE: invention relates to metal sealing assembly for sealing annular space in well. Metal sealing assembly for sealing annular space in the well comprises a metal sealing element which is made in the form of a hollow cylinder and consists of a base; inner tubular part and outer annular edge, case inducing, sealing ledges on sealing element, sealing surface of housing of casing string suspension is in form of truncated cone diverging to bottom of well, fixing ring. Metal sealing element and inducing housing includes upper and lower sections. Upper part of inner surface of annular edge of sealing element is made in form of combination of two truncated cones. Upper part of one cone is narrowed to the top of the well, the lower part of the other cone expands to the top of the well. Solution angle is selected within range of 0–10°. Upper part of the outer surface of the inducing housing is made in the form of a combination of two truncated cones, the upper and lower parts of which narrow to the bottom of the well. Upper cone solution angle is selected within 0–10°. Radius of circle, along which mating the upper and lower parts of surface of pressing housing, is equal to radius of cylinder formed by upper part of inner surface of outer edge of metal sealing element at stage of pre-sealing.

EFFECT: technical result is higher reliability of sealing of annular space.

1 cl, 5 dwg