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, upper and lower outer centralizers, between which upper and lower cuffs are installed in series in the form of discs located between metal rings, which are attached to the branch pipe. Cuffs are equipped with filtration holes and filter elements. Each centralizer is made in the form of an open bowl, expanding from bottom to top, with an outer diameter of 8–12 mm less than the inner diameter of the production string, and the outer diameter of both cuffs is 2–4 mm larger than the inner diameter of the production string. The filtration holes in each cuff are made through, passing through both rings and the corresponding cuff, and the filter element is made in the form of a sleeve inserted into the corresponding hole, with a filter mesh inside.

EFFECT: cuffs and filter elements are protected from large mechanical impurities, the effect of swabbing with the outflow of well fluid is eliminated when the device is raised to the surface with environmental protection.

2 cl, 2 dwg