METHOD OF LIMITATION OF PRODUCED WATER INFLOW TO PRODUCTION WELL Russian patent published in 2017 - IPC E21B43/32 C09K8/487 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to methods of water insulation works in the production wells. According to the method the operation string is perforated against production zone. A highly permeable shield is formed in additionally perforated through the operation string top part of the aquiferous zone. This is performed by water insulating material delivery to this zone. Preliminary prior to stimulation of the formation fluids inflow the perforation interval of production and aquiferous zones is separated by a packer installation. In the operation string additionally tubing string is lowered till tight fixation of tubing lower part in the packer. The tubing string is partially filled with insulating material. As insulating material 10-15% paraffin solution in diesel fuel is used with density below water density in the aquiferous stratum. After paraffin solution in diesel fuel injection in the tubing string the process liquid on water base is injected. At the process liquid density exceeding density of the paraffin solution in diesel fuel the process liquid is injected via separating plug. Height of the process liquid column is determined according to an analytical expression considering height of the process liquid column, pressure in aquiferous part of the formation, distance from wellhead to top border of the perforation interval in the aquiferous stratum, density of the process liquid and paraffin solution in diesel fuel.

EFFECT: method limiting the produced water inflow in the production well increasing efficiency of water insulation.

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