METHOD OF ISOLATION OF WATER SUPPLY IN OIL-EXTRACTING WELL Russian patent published in 2018 - IPC E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry, in particular to methods of conducting waterproofing operations in oil producing wells. Method of isolating the water inflow in the oil producing well includes damping the well, extracting the downhole equipment, lowering and installing the packer plug to the base of the flooded formation. Then the PCT assembly with the "feather" and the packer is lowered and installed upto the roof of the watered bed. Then hydrotest of the PCT with the packer is carried out, the injectivity of the watered formation is determined. Under the pressure at a predetermined interval, a waterproofing composition based on ethyl silicate (ETS) + a hydrophobizing silicone fluid (HSF) + clay powder is pumped, then a composition based on the microdur with a modifier and a plasticizer is pumped in for reinforcement. After the micro-cement beaker is installed to the roof of the watered formation and the well is left for cement hardening. Then the micro-cement beaker and the packer-plug are drilled, the assembly with the perforator is lowered and the production column is repeatedly perforated in the interval of the productive formation.

EFFECT: proposed method allows to increase the strength and radius of the waterproofing screen, and also to increase the period of anhydrous operation of the well.

1 cl, 3 dwg