OVER-PACKER SLUDGE TRAP Russian patent published in 2023 - IPC E21B37/00 

FIELD: oil industry.

SUBSTANCE: invention is intended to trap mechanical impurities above the packer in the annular space of the well. The device includes a branch pipe installed above the packer, upper and lower centralizers, between which upper and lower cuffs in the form of disks are installed in series, located between metal rings, which are attached to the branch pipe. The upper cuff is made in the form of two rubber rings with filtration holes, between which a filter element in the form of a ring is installed. The lower cuff is made in the form of a brush disk. The outer diameter of both cuffs is 2–4 mm larger than the inner diameter of the production string. The stabilizers are made hollow with the possibility of placing magnets in these cavities. The filter element can be made prefabricated, consisting of at least two sequentially installed grids in the form of disks with mesh sizes decreasing from top to bottom.

EFFECT: protection against metal impurities, eliminating the effect of pistoning with the outflow of liquid when lifting to the surface, while protecting the environment.

2 cl, 2 dwg