MILL DIVERTER CONTAINING EXPANDING MATERIAL TO PREVENT FLUID LEAKS THROUGH MATERIAL Russian patent published in 2017 - IPC E21B7/08 

FIELD: mining engineering.

SUBSTANCE: method for preventing fluid leaks through the converging surface of the mill diverter in the cased hole is characterized in that the mill diverter is located in the cased hole. In this case, the mill diverter includes a body, the converging surface disposed at one end of the body, a fishing unit and the expanding material that is located around the circumference of the mill diverter body and abuts to the converging surface and positioned between the converging surface and the fishing unit, and expands in the presence of expanding fluid.

EFFECT: expansion of the expanding material or the possibility of its expansion, preventing the leak of entire fluid through the expanding material after its expansion.

18 cl, 4 dwg