METHOD FOR ELIMINATION OF FLUID CROSSFLOWS IN A WELL Russian patent published in 2019 - IPC E21B33/13 

FIELD: mining.

SUBSTANCE: invention relates to a method for elimination of fluid crossflows in a well. Method of elimination of fluid crossflows in the well includes cutting of part of the casing string in the interval of the pay of the productive stratum, removal of plugging material in the interval of the cut section of the casing string and expansion of the well shaft. In the extended section of the well bore, the upper hydraulic filled packer is lowered and unpacked into the well as a part of the packer assembly. Besides, lower hydraulically controlled packer rigidly connected to upper hydraulic filled packer is lowered for attachment of packer assembly in well. Upper hydraulic filler packer is equipped with a sleeve sealing element made of elastomer material, part of the volume of which before filling of the packer assembly is filled with plugging gel-like compound. Said composition has viscoplastic properties and hardening properties upon contact with working fluid. Layer of plastic sealing material is applied on outer surface of sleeve sealing element.

EFFECT: technical result is higher efficiency of recovery and providing tightness of annular and intercasing space of the well.

1 cl