METHOD OF WELL'S HORIZONTAL BOREHOLE PART REPAIR INSULATION WORKS Russian patent published in 2010 - IPC E21B33/13 

FIELD: oil-and-gas production.

SUBSTANCE: method includes pumping equipment withdrawal from the well, descending a tubing string into to the well, pumping water shut off solution with harden properties inside them, and the following the water shut off solution washing away. The tubing string equipped with a hydro monitoring nozzle and a plug seat with holes, connecting the tubing string inside space and a borehole, at that pump through the holes highly viscous water-repellent water non-soluble solution in to insulating interval, the a cement slurry based on I-G cement type with water - cement ratio 0.44, install a plug with a deformable membrane closing end-to end inside channel, the pump in an overflush fluid till the plug settled in the seat, lift pipes to safe area. After the cement slurry hardening up to 100 Vs descend an assembly, increase pressure in TS by pumping in overflush fluid until the membrane failed and wash cement away from borehole by pumping washing liquid with cement hardening retarding mixture through the tubing string via hydro monitoring nozzle.

EFFECT: water shut off screen sealing properties increase.

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