METAL SUPPORT RING WITH HIGH DEGREE OF EXPANSION FOR PACKERS AND BRIDGE PLUG Russian patent published in 2020 - IPC E21B33/12 

FIELD: mining.

SUBSTANCE: group of inventions relates to a method of holding a packer element, assembling a support ring, and assembling a bottomhole of a drill string. Method of retention of the packer element includes using the support ring arrangement, which is in contact with at least one packer element. Assembly contains at least one wedge-shaped spiral ring. Spiral ring has at least one outer peripheral end surface made with possibility of contact with borehole casing or countersunk casing, at least one conical, inner peripheral end surface is made with possibility of contact with at least one of: part of holder, part of holder with conical end surface, part of mandrel and their combinations. Spiral ring has axial end surface made with possibility of rotation for increase in diameter of external peripheral end surface and for contact with at least one packer element. Assembly of the support ring comprises at least one wedge-shaped spiral ring. Arrangement of bottom of drill string includes elongated mandrel made with possibility of arrangement in borehole casing or countersunk casing string, holder is made with possibility of sliding engagement along the mandrel, packer element, at least one wedge-like spiral ring. Spiral ring is located between holder and packer element. Holder has conical surface.

EFFECT: technical result is higher reliability of operation under high pressure conditions.

17 cl, 4 dwg