ISOLATION METHOD OF WATER INFLUXES TO WELL (VARIANTS) Russian patent published in 2018 - IPC E21B33/138 C09K8/504 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the oil and gas production industry, in particular to methods of carrying out waterproofing operations in production wells, as well as to methods for leveling the injectivity profile in injection wells. Method for isolating water inflows into a well according to the first embodiment includes the preparation and injection into the isolation zone of a waterproofing composition consisting of 25 vol. parts high modulus liquid glass with silicate module 3.5–6 and 25–250 saturated sodium silicofluoride. In the second variant, the waterproofing composition is prepared at 25 vol. parts 0.3–0.5 % solution of sodium silicofluoride and additionally 1–5 vol. parts of ethyl acetate and 0.1 vol. p. of detergent with a mass fraction of surfactants of 30–38 %.

EFFECT: technical result is an increase in the efficiency of the method due to the expansion of the time range for gelling the waterproofing composition and increasing the stability of the resulting gel in fresh and slightly mineralized waters.

2 cl, 2 tbl, 2 ex