LIMITATION OF WELL WATER PRODUCTION Russian patent published in 2014 - IPC E21B33/138 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises mixing of liquid glass with gelation regulator and injection into the well. First, 0.03-0.05% solution of polyacrylamide DP9-8177 is prepared and added to said liquid glass to be mixed till a homogeneous mix. Then, obtained mix and gelation regulator are injected and separated by fresh water buffer at the following ratio of components: 20-50 vol. % of liquid glass, 10-15 vol. % of solution of polyacrylamide DP9-8177, 40-65 vol. % of gelation regulator. The latter represents 10-20% solution of commercial calcium chloride or 10-20% solution POLYPACS-30LF (polyaluminium chloride).

EFFECT: higher efficiency of water shut-off.

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