WELL WALL SEALING DEVICE Russian patent published in 2021 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to devices for sealing the walls of a well. The device includes a plaster with elastic elements, cylindrical ends and an anchor made in the form of a longitudinally corrugated branch pipe with an outer diameter when the corrugations expand, not less than the inner diameter of the well at the installation site. The upper end of the patch is equipped with a threaded sub and a rolling head with a milling cutter, the lower end of the patch is equipped with a shoe. The patch is made longitudinally corrugated. The described anchor diameter is 1.5-2% less than the borehole diameter. The anchor is equipped with calibrating elements made in the form of hard-alloy crumb surfacing on the corrugation tops. The sub is provided in the lower part with protrusions located inside the corrugations of the plaster. In the upper part, the sub is equipped with a groove with a conical chamfer for rolling the upper end of the plaster. The sub is connected from above to the rolling head. The shoe is made through passage and equipped with a seat for a ball. The conical chamfer of the sub is made with the possibility of creating an additional distribution of the upper end of the patch when the sub is pushed out.

EFFECT: reliability of sealing is increased, the possibility of flushing and calibrating the borehole walls before installation is ensured, isolation of the interval of long disturbances.

1 cl, 1 dwg