ISOLATION METHOD OF WATER INFLUX TO OIL PRODUCER Russian patent published in 2014 - IPC E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: isolation method of water influx to the oil producer includes cyclic pumping of the water-control compound to the water-flooded productive stratum and time for soaking. At that each successive cycle of the water-control compound pumping in regard to the previous cycle is made with increase of the injection pressure and volume of the water-control compound, at that ratios of pressure and volume are equal to 1:1, 2:2, 3:3, 4:4 respectively in cycles 1, 2, 3, 4, etc. Time for soaking in the cycles is selected so that complete formation of gel takes place from the water-control compound injected during the first cycle but in any way not earlier than the last cycle of the water-control compound injection is completed. At that squeezing of the water-control compound in each cycle is made by the process water with pH=6.0-6.5. After soaking time in the last cycle, the injection pressure is bled off up to the atmosphere pressure.

EFFECT: efficient isolation of oil formation bypass manifold.

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