METHOD TO ISOLATE INFLOW OF RESERVOIR WATER IN LOW-ANGLE AND HORIZONTAL WELLS Russian patent published in 2013 - IPC E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: method provides for isolation of an inflow of reservoir water in low-angle and horizontal wells, equipped in productive formations with a tail filter separated into sections with solid and filter sections with packers installed on each segment of solid sections and connected with a lift string, the diameter of which is more or equal to the diameter of the tail filter. According to the invention, as water level increases in the productive formation, serially, without well plugging, a perforation charge is lowered on a flexible pipe via a stuffing box into the tail filter. Perforation holes are created under the packer in the zone of inflow of reservoir water. The flexible pipe is extracted. Then a packer plug is lowered on it with circulation holes. The pipe space is sealed over the zone of reservoir water inflow in the segment of the solid section, and a process fluid is injected for absorption into a waterlogged section of the bed under the packer plug for displacement of the reservoir water. This zone is filled with a tamping fluid. Afterwards the flexible pipe is disconnected from the packet plug, lifted above the packer plug to close circulation holes and extracted from the well. After dismantling of the stuffing box the well is put in service with operation of the bed above the packer plug.

EFFECT: improved accuracy of injection of a water-isolating composition into an interval of reservoir water arrival in low-angle and horizontal wells without their plugging.

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