CASING SHOE Russian patent published in 2021 - IPC E21B17/14 

FIELD: mining.

SUBSTANCE: invention relates to the mining industry and can be used for lowering the casing into a wellbore complicated by ledges and caverns during its construction. The casing shoe includes a hollow cylindrical body with a connecting thread in the upper part for connection with the casing and a recess in the lower part of the body. At least two cylindrical pins are installed on the outer side of the lower part of the hollow cylindrical body along the perimeter. The lower part of the hollow cylindrical body is equipped with a hollow eccentric tip having through longitudinal screw grooves on the surface with the possibility of alignment with the cylindrical pins of the hollow cylindrical body. On the inner side of the hollow eccentric tip, a recess is made with the possibility of installing the working spring and interaction of one end of the working spring with the hollow eccentric tip, and the recess in the lower part of the hollow cylindrical body is made on the inner side of the body with the possibility of installing the working spring and interaction of the other end of the working spring with the hollow cylindrical body.

EFFECT: invention increases reliability of running and installing the casing in a complicated wellbore, including in the presence of steep ledges in the intervals of cavities, increases work efficiency, reduces labor costs for the manufacture of numerous units of the device.

1 cl, 3 dwg