FIELD: development of oil and gas deposits with\ bottom water; applicable in isolation of water-encroached formations in development wells. SUBSTANCE: method includes injection of isolating compositions blocking inflow of isolating compositions to formation producing part. Additional pipes with packer are lowered into well through tubing string. Packer is installed within perforation interval. Injection of isolating compositions and blocking compositions is carried out separately through tubing and additional pipes. Injection of isolating compositions is carried out by additional pipes or tubing pipes depending on place of water shutoff-below or above the perforation interval, respectively. EFFECT: higher process and economical efficiency of formation water shutoff due to reduced number of process operations. 1 dwg
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