METHOD FOR ISOLATION OF FORMATION WATER INFLUX AT SECTIONS OF THEIR SUPPLY IN WELLS WITH HORIZONTAL TERMINATION Russian patent published in 2019 - IPC E21B43/32 E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and is intended for isolation of influx of formation water in horizontal sections of oil producing wells. Method involves extraction of downhole equipment from a well, performance of geophysical investigations in a horizontal section of a well shaft, determination of a water influx interval from an aquifer. At that, flap-type double check valve, emergency disconnector, centralizers, two packers of inflatable action are lowered on flexible pipe equipped with connector, between which by means of coupling connections perforated connection pipe, ball discharge into flexible pipes, pumping of water-insulation composition into flexible pipe, ball release to emergency disconnector, creation of hydraulic pressure, disconnection of flexible pipe from equipment and its lifting to surface, leaving the well waiting for hardening of cement, lowering the equipment with the cutter on the flexible pipe, drilling the perforated branch pipe, inflatable packers and the water isolation composition residues with wash-out to the day surface, lowering the downhole equipment; well development and mode output.

EFFECT: technical result consists in improvement of efficiency of water shutoff operations, isolation of influx of formation water in a cased horizontal section of the wellbore.

1 cl, 7 dwg