COLUMN SHOE Russian patent published in 2019 - IPC E21B17/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to construction of oil and gas wells, in particular to equipment for tooling of lower part of casing string. Shoe block includes a body with a central channel, one end of which is intended for connection to a pipe string, a bushing inserted into the other end of the body, a central channel from below with a constriction, above which side holes are made. Bushing is inserted inside the housing with fixation by shear elements for sealing of side holes with the possibility of movement downwards to narrowing of the central channel of the housing under action of a throw ball and opening of side holes. On external surface of housing there are identical screw recesses interconnected in lower part with corresponding side holes.

EFFECT: improving quality of cementing of casing string due to good washing of well bore through central flushing channel during string lowering, reliable shutting of holes in horizontal bore of shoe after completion of blasting.

1 cl, 4 dwg